Use local rebar, closes #515

2012-10-08 19:20:25 +02:00
738 changed files with 24237 additions and 253288 deletions
@@ -1,50 +0,0 @@
-env:
-  CIRRUS_CLONE_DEPTH: 50
-  ELIXIR_ASSERT_TIMEOUT: 2000
-  ELIXIRC_OPTS: "--warnings-as-errors"
-  ERLC_OPTS: "warnings_as_errors"
-  LANG: C.UTF-8
-
-test_template: &DEFAULT_TEST_SETTINGS
-  # don't cancel the task execution if it's master or a release branch
-  auto_cancellation: $CIRRUS_BRANCH != 'master' && $CIRRUS_BRANCH !=~ 'v\d+\.\d+.*'
-
-test_freebsd_task:
-  <<: *DEFAULT_TEST_SETTINGS
-
-  name: FreeBSD 13.0
-  alias: FreeBSD Stable
-
-  freebsd_instance:
-    image_family: freebsd-13-0
-    cpu: 8
-    memory: 7424Mi
-
-  env:
-    CHECK_REPRODUCIBLE: true
-    LC_ALL: en_US.UTF-8
-    PATH: $PATH:/usr/local/lib/erlang22/bin
-
-  install_script:
-    - pkg install -y erlang-runtime22 git gmake
-    - rm -rf .git
-    - gmake compile
-
-  build_info_script: bin/elixir --version
-
-  test_formatted_script:
-    - gmake test_formatted &&
-      echo "All Elixir source code files are properly formatted."
-
-  dialyzer_script: dialyzer -pa lib/elixir/ebin --build_plt --output_plt elixir.plt --apps lib/elixir/ebin/elixir.beam lib/elixir/ebin/Elixir.Kernel.beam
-
-  test_erlang_script: gmake test_erlang
-
-  test_elixir_script: gmake test_elixir
-
-  check_reproducible_script: |
-    if [ -n "$CHECK_REPRODUCIBLE" ]; then
-      gmake check_reproducible
-    else
-      echo "The reproducibility of the build is only checked in the last stable Erlang/OTP version."
-    fi
@@ -1,18 +0,0 @@
-[
-  inputs: [
-    "lib/*/{lib,unicode,test}/**/*.{ex,exs}",
-    "lib/*/*.exs",
-    "lib/ex_unit/examples/*.exs",
-    ".formatter.exs"
-  ],
-  locals_without_parens: [
-    # Formatter tests
-    assert_format: 2,
-    assert_format: 3,
-    assert_same: 1,
-    assert_same: 2,
-
-    # Errors tests
-    assert_eval_raise: 3
-  ]
-]
@@ -1,3 +0,0 @@
-lib/elixir/test/elixir/fixtures/*.txt text eol=lf
-*.ex diff=elixir
-*.exs diff=elixir
@@ -1,21 +0,0 @@
-### Precheck
-
-* For proposing a new feature, please start a discussion on the Elixir Core mailing list: https://groups.google.com/group/elixir-lang-core
-* For bugs, do a quick search and make sure the bug has not yet been reported
-* Please disclose security vulnerabilities privately at elixir-security@googlegroups.com
-* Do not use the issues tracker for guidance, questions or support (try Elixir Forum, Stack Overflow, Slack, etc. instead)
-* Finally, be nice and have fun!
-
-### Environment
-
-* Elixir & Erlang/OTP versions (elixir --version): 
-* Operating system: 
-
-### Current behavior
-
-Include code samples, errors and stacktraces if appropriate.
-If reporting a bug, please include the reproducing steps.
-
-### Expected behavior
-
-A short description on how you expect the code to behave.
@@ -1,106 +0,0 @@
-name: CI
-
-on: [pull_request, push]
-
-env:
-  ELIXIR_ASSERT_TIMEOUT: 2000
-  ELIXIRC_OPTS: "--warnings-as-errors"
-  ERLC_OPTS: "warnings_as_errors"
-  LANG: C.UTF-8
-
-jobs:
-  test_linux:
-    name: Linux, ${{ matrix.otp_release }}, Ubuntu 18.04
-    strategy:
-      fail-fast: false
-      matrix:
-        otp_release: ['OTP-24.0', 'OTP-23.3', 'OTP-23.0', 'OTP-22.3', 'OTP-22.0']
-        development: [false]
-        include:
-          - otp_release: master
-            development: true
-          - otp_release: maint
-            development: true
-    runs-on: ubuntu-18.04
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 50
-      - name: Install Erlang/OTP
-        run: |
-          cd $RUNNER_TEMP
-          wget -O otp.tar.gz https://repo.hex.pm/builds/otp/ubuntu-18.04/${{ matrix.otp_release }}.tar.gz
-          mkdir -p otp
-          tar zxf otp.tar.gz -C otp --strip-components=1
-          otp/Install -minimal $(pwd)/otp
-          echo "$(pwd)/otp/bin" >> $GITHUB_PATH
-      - name: Compile Elixir
-        run: |
-          rm -rf .git
-          make compile
-      - name: Build info
-        run: bin/elixir --version
-      - name: Check format
-        run: make test_formatted && echo "All Elixir source code files are properly formatted."
-      - name: Dyalizer
-        run: dialyzer -pa lib/elixir/ebin --build_plt --output_plt elixir.plt --apps lib/elixir/ebin/elixir.beam lib/elixir/ebin/Elixir.Kernel.beam
-      - name: Erlang test suite
-        run: make test_erlang
-        continue-on-error: ${{ matrix.development }}
-      - name: Elixir test suite
-        run: make test_elixir
-        continue-on-error: ${{ matrix.development }}
-      - name: Check reproducible builds
-        run: taskset 1 make check_reproducible
-        if: matrix.otp_release == 'OTP-24.0'
-
-  test_windows:
-    name: Windows, OTP-${{ matrix.otp_release }}, Windows Server 2019
-    strategy:
-      matrix:
-        otp_release: ['22.3']
-    runs-on: windows-2019
-    steps:
-      - name: Configure Git
-        run: git config --global core.autocrlf input
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 50
-      - name: Cache Erlang/OTP package
-        uses: actions/cache@v2
-        with:
-          path: C:\Users\runneradmin\AppData\Local\Temp\chocolatey\erlang
-          key: OTP-${{ matrix.otp_release }}-windows-2019
-      - name: Install Erlang/OTP
-        run: choco install -y erlang --version ${{ matrix.otp_release }}
-      - name: Compile Elixir
-        run: |
-          remove-item '.git' -recurse -force
-          make compile
-      - name: Build info
-        run: bin/elixir --version
-      - name: Check format
-        run: make test_formatted && echo "All Elixir source code files are properly formatted."
-      - name: Erlang test suite
-        run: make --keep-going test_erlang
-      - name: Elixir test suite
-        run: |
-          del c:/Windows/System32/drivers/etc/hosts
-          make --keep-going test_elixir
-
-  check_posix_compliant:
-    name: Check POSIX-compliant
-    runs-on: ubuntu-18.04
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 50
-      - name: Install Shellcheck
-        run: |
-          sudo apt update
-          sudo apt install -y shellcheck
-      - name: Check POSIX-compliant
-        run: |
-          shellcheck -e SC2039,2086 bin/elixir && echo "bin/elixir is POSIX compliant"
-          shellcheck bin/elixirc && echo "bin/elixirc is POSIX compliant"
-          shellcheck bin/iex && echo "bin/iex is POSIX compliant"
@@ -1,13 +1,13 @@
-/doc/
-/lib/*/ebin/
-/lib/*/_build/
-/lib/*/tmp/
+/.eunit/*
+/.full
+/lib/*/ebin/*
+/lib/*/tmp
+/lib/*/test/tmp
+/lib/elixir/src/elixir.app.src
+/lib/elixir/src/*_lexer.erl
 /lib/elixir/src/*_parser.erl
-/lib/elixir/test/ebin/
-/man/elixir.1
-/man/iex.1
-/Docs-v*.zip
-/Precompiled-v*.zip
-/.eunit
-.elixir.plt
-erl_crash.dump
+/lib/elixir/test/ebin
+/deps/*
+/ebin
+/rel/elixir
+erl_crash.dump
@@ -0,0 +1,9 @@
+language: erlang
+script: "make compile && make .full test"
+notifications:
+  irc: "irc.freenode.org#elixir-lang"
+  recipients:
+    - jose.valim@plataformatec.com.br
+otp_release:
+  - R15B01
+  - R15B
@@ -1,337 +1,53 @@
-# Changelog for Elixir v1.13
-
-The focus behind Elixir v1.13 has been on tooling, mainly tooling related to code formatting, code fragments, code reflection, and code recompilation. A lot of this functionality will directly impact developers working on large codebases and provide meaningful quality of life improvements for those working on Elixir tooling and environments, such as IDEs, notebooks, etc.
-
-## Semantic recompilation
-
-Elixir v1.13 comes with many improvements to the compiler, so it recompiles your files less frequently. In particular:
-
-  * The digest of the files are considered in addition to their size. This avoids recompiling many files when switching or rebasing branches.
-
-  * Changing your `mix.exs` will no longer trigger a full recompilation, unless you specifically change the configurations used by the Elixir compiler (`:elixirc_paths` and `:elixirc_options`).
-
-  * Changing compile-time configuration files (`config/config.exs` and any other file imported from it) now only recompiles the project files that depend on the reconfigured applications, instead of a full recompilation. However, if you change the configuration of your application itself, the whole project is still recompiled.
-
-  * Adding, updating or removing a dependency now only recompiles the project files that depend on the modified a dependency.
-
-  * If your project has both Erlang and Elixir files, changing an Erlang file will now recompile only the Elixir files that depend on it.
-
-In a nutshell, Elixir went from triggering full recompilations whenever any of `mix.exs`, `config/config.exs`, `src/*`, and `mix.lock` changed on disk to semantic recompilations. Now it only fully recompiles when:
-
-  * you change the compilation options in `mix.exs`
-  * you change the configuration for the current project in `config/config.exs`
-
-## mix xref
-
-`mix xref` is a tool that analyzes relationships between files. By analyzing the compile-time and runtime dependencies between files, it allows developers to understand what files have to be recompiled whenever a file changes.
-
-Elixir v1.13 comes with many improvements to `mix xref`, such as:
-
-  * `mix xref graph` now supports `--label` to be set to "compile-connected", which returns all compile-time dependencies that lead to additional transitive dependencies.
-
-  * A new `mix xref trace FILE` subcommand receives a file and returns all dependencies in said file, including the line and what caused said dependency (a function/macro call, an alias, a struct, etc).
-
-  * All `mix xref` subcommands support the `--fail-above` flag, which allows you to enforce your project has at most a certain number of compile-time cycles, transitive compile-time dependencies, etc.
-
-  * `mix xref graph` now supports multiple `--sink` and `--source` to be given.
-
-With these improvements, it has become simpler to understand the impact code recompilation has in our codebases and how to limit it.
-
-## Code fragments
-
-The `Code` module got a companion module called `Code.Fragment`, which hosts functions that work on incomplete code, as is often the scenario in editors, interactive shells, etc. The module contains different heuristics to analyze the source code and return context informational.
-
-Thanks to these improvements, `IEx`' autocomplete got several quality of life improvements, such as the autocompletion of sigils, structs, and paths. For example, typing `~<TAB>` now shows:
-
-```iex
-iex(1)> ~
-~C (sigil_C)    ~D (sigil_D)    ~N (sigil_N)    ~R (sigil_R)
-~S (sigil_S)    ~T (sigil_T)    ~U (sigil_U)    ~W (sigil_W)
-~c (sigil_c)    ~r (sigil_r)    ~s (sigil_s)    ~w (sigil_w)
-
-```
-
-Adding the sigil letter and pressing tab then shows the available delimiters:
-
-```iex
-iex(1)> ~r
-"      """    '      '''    (      /      <      [      {      |
-
-```
-
-Similarly, `%<TAB>` now shows only the available structs (exceptions excluded), instead of all modules:
-
-```elixir
-iex(1)> %File.St
-File.Stat      File.Stream
-```
-
-Once you define the struct, you can hit `tab` to show all struct fields available:
-
-```elixir
-iex(1)> %URI{
-authority:    fragment:     host:         path:         port:
-query:        scheme:       userinfo:
-```
-
-As you fill a field in, the already filled fields no longer show up:
-
-```elixir
-iex(1)> %URI{path: "/example",
-authority:    fragment:     host:         port:         query:
-scheme:       userinfo:
-```
-
-Along the same lines, `SyntaxError` and `TokenMissingError` were improved to show a code snippet whenever possible:
-
-```elixir
-$ elixir -e "hello + * world"
-** (SyntaxError) nofile:1:9: syntax error before: '*'
-    |
-  1 | hello + * world
-    |         ^
-```
-
-Finally, new compilation tracers have been added, alongside a handful of functions in `Module` to retrieve module metadata, which can be used to enrich suggestions in programming environments.
-
-## Extended code formatting
-
-The `mix format` task has been augmented with the notion of plugins. Plugins can teach the formatter how to format new files and how to format sigils, via the `Mix.Tasks.Format` behaviour.
-
-For example, imagine that your project uses Markdown in two distinct ways: via a custom `~M` sigil and via files with the `.md` and `.markdown` extensions. A custom plugin would look like this:
-
-```elixir
-defmodule MixMarkdownFormatter do
-  @behaviour Mix.Tasks.Format
-
-  def features(_opts) do
-    [sigils: [:M], extensions: [".md", ".markdown"]]
-  end
-
-  def format(contents, opts) do
-    # logic that formats markdown
-  end
-end
-```
-
-Now any application can use your formatter as follows:
-
-```elixir
-# .formatter.exs
-[
-  # Define the desired plugins
-  plugins: [MixMarkdownFormatter],
-  # Remember to update the inputs list to include the new extensions
-  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}", "posts/*.{md,markdown}"]
-]
-```
-
-Finally, the `Code` module has also been augmented with two functions: `Code.string_to_quoted_with_comments/2` and `Code.quoted_to_algebra/2`. Those functions allow someone to retrieve the Elixir AST with their original source code comments, and then convert this AST to formatted code. In other words, those functions provide a wrapper around the Elixir Code Formatter, supporting developers who wish to create tools that directly manipulate and custom format Elixir source code.
-
-## v1.13.1 (2021-12-14)
-
-### 1. Bug fixes
-
-#### Elixir
-
-  * [Code] Do not show code snippets in `SyntaxError` and `TokenMissingError` if line is empty
-  * [Exception] Do not fail blaming `ArgumentError` for improper lists on `apply/3`
-  * [Macro] Set a max `line_length` for `Macro.to_string/1`
-  * [Macro] Fix formatting of lists on module attributes for `Macro.to_string/1`
-  * [String] Fix incorrect codepoint byte counting in `slice` with negative positions in ranges
-  * [Task] Ensure async streams can be consumed from another process than the one that creates them
-  * [URI] Undeprecate `URI.parse/1` as `URI.new/1` is too strict in many common cases
-  * [URI] Make sure `URI.new/1` returns nil for empty paths
-
-#### IEx
-
-  * [IEx] Make sure the `--version` flag halts IEx
-
-#### Mix
-
-  * [Mix] Make protocol consolidation part of the `Mix.install/2` cache
-
-## v1.13.0 (2021-12-03)
-
-### 1. Enhancements
-
-#### EEx
-
-  * [EEx] Add `:parser_options` to EEx functions
-
-#### Elixir
-
-  * [Calendar] Add `c:Calendar.year_of_era/3` to support calendars where the beginning of a new era does not align with the beginning of a new year
-  * [CLI] Support `--short-version` on the CLI that does not boot the VM
-  * [Code] Add `Code.string_to_quoted_with_comments/2` and `Code.quoted_to_algebra/2`
-  * [Code] Add more `:token_metadata` to aliases and remote calls when parsing strings
-  * [Code] Add `Code.Fragment` module to provide best-effort information from code fragments. The module currently provides an updated `Code.Fragment.cursor_context/2` with operator support and `Code.Fragment.surround_context/2` which looks at a given position in a fragment and find its surrounding delimiters
-  * [Code] Allow custom sigil formatting on `Code.format_string!/2`
-  * [Code] Add `{:on_module, bytecode, :none}` trace to compilation tracers
-  * [Enum] Optimize `Enum.concat/1` for lists of lists
-  * [Enum] Add `Enum.slide/3`
-  * [Exception] Better format Elixir exceptions in Erlang
-  * [Inspect] Allow default inspect fun to be set globally with `Inspect.Opts.default_inspect_fun/1`
-  * [IO] Allow `:eof` to be given as limit to `IO.getn/2`
-  * [Kernel] Support the `:sigils` option in `import Mod, only: :sigils` and allow the sigil modifiers to be also digits
-  * [Kernel] Make `get_in` consistently abort and return `nil` when `nil` values are found (previously Elixir would raise an error in this case). This allows a user to use `get_in` as a safe navigation operator.
-  * [Kernel] Improve compilation times by reducing the amount of copies of the AST across compiler processes
-  * [Kernel] Raise if trying to define a module with a slash in its name
-  * [Kernel] Warn when `?\` is used and there is no need for a escape character
-  * [Kernel] Track structs in typespecs as export deps instead of compile-time deps
-  * [Kernel] Add power operator (`**/2`)
-  * [Keyword] Add `Keyword.validate/2`
-  * [Keyword] Implement `Keyword.filter/2` and `Keyword.map/2`
-  * [List] Add `List.keyfind!/3`
-  * [Macro] Add `Macro.prewalker/1` and `Macro.postwalker/1`
-  * [Macro.Env] Add the following reflection functions: `required?/2`, `lookup_import/2`, `fetch_alias/2`, and `fetch_macro_alias/2`
-  * [Map] Implement `Map.filter/2` and `Map.map/2`
-  * [Module] Support `:nillify_clauses` in `Module.get_definition/3`
-  * [Module] Add `Module.attributes_in/1` and `Module.overridables_in/1`
-  * [OptionParser] Add "did you mean?" suggestions to `OptionParser.ParseError` messages
-  * [Record] Add record reflection via `@__records__`
-  * [Task] Add `Task.completed/1`
-  * [Task] Add `Task.ignore/1` to keep a task running but ignoring all of its results
-  * [Task] Reduce the amount of copying `Task.async*` functions
-  * [URI] Add `URI.new/1` and `URI.new!/1`
-
-#### ExUnit
-
-  * [ExUnit] Show hint if comparing different but equivalent strings
-  * [ExUnit.CaptureIO] Add `with_io/3` to return result with captured io
-  * [ExUnit.CaptureLog] Add `with_log/2` to return result with captured logs
-
-#### IEx
-
-  * [IEx.Autocomplete] Add path autocompletion whenever when the cursor follows `"./` or `"/` or `"DRIVER:` where `DRIVER` is a single letter
-  * [IEx.Autocomplete] Add autocompletion for sigils, struct names, and struct fields
-  * [IEx.Helpers] Allow multiple modules to be given to `r/1`
-
-#### Logger
-
-  * [Logger] Add `Logger.put_application_level/2`
-
-#### Mix
-
-  * [Mix] Add `MIX_INSTALL_FORCE` environment variable support
-  * [Mix] Support `:config` and `:system_env` in `Mix.install/2`
-  * [Mix] Add `Mix.installed?/0`
-  * [Mix.Shell] Add `:default` option to `Mix.Shell.yes?`
-  * [mix archive.install] Run `loadconfig` before building archive
-  * [mix compile] Move Elixir version check to before deps are compiled, in order to give feedback earlier
-  * [mix compile.elixir] Do not recompile files if their modification time change but their contents are still the same and the .beam files are still on disk
-  * [mix compile.elixir] Do not recompile all Elixir sources when Erlang modules change, only dependent ones
-  * [mix compile.elixir] Do not recompile Elixir files if `mix.exs` changes, instead recompile only files using `Mix.Project` or trigger a recompilation if a compiler option changes
-  * [mix compile.elixir] Only recompile needed files when a dependency is added, updated or removed
-  * [mix compile.elixir] Only recompile needed files when a dependency is configured
-  * [mix deps] Add `:subdir` option to git deps
-  * [mix escript.install] Run `loadconfig` before building escript
-  * [mix format] Support `:plugins` in `mix format` that can hook into custom extensions and sigils
-  * [mix format] Add `Mix.Tasks.Format.formatter_for_file/2`
-  * [mix local.rebar] No longer support `sub_dirs` in Rebar 2 to help migration towards Rebar 3
-  * [mix local.rebar] Support `--if-missing` option when installing Rebar
-  * [mix local.rebar] Set `REBAR_PROFILE=prod` when compiling Rebar dependencies
-  * [mix test] Support `--profile-require=time` to profile the time loading test files themselves
-  * [mix test] Allow filtering modules from coverage using regex
-  * [mix test] Allow the exit status of ExUnit to be configured and set the default to 2
-  * [mix test] Exit with a status of 3 when coverage falls below threshold
-  * [mix test] Write failed manifest when suite fails due to --warnings-as-errors
-  * [mix test] Ignore `MIX_TEST_PARTITION` when partitions set to 1
-  * [mix xref] Support multiple sinks and sources in `mix xref graph`
-  * [mix xref] Add `trace` subcommand to print compilation dependencies between files
-  * [mix xref] Add `--fail-above` option to `mix xref`
-  * [mix xref] Add `--label compile-connected` to `mix xref`
-
-### 2. Bug fixes
-
-#### EEx
-
-  * [EEx] Accept comments in EEx between do and the first clause
-  * [EEx] Accept EEx expressions where `->` is followed by newline
-
-#### Elixir
-
-  * [Application] Allow any expression as first argument of `compile_env`
-  * [Application] Warn if `Application.compile_env` or `Application.compile_env!` are called without a require
-  * [Code] Make sure `:static_atoms_encoder` in `Code.string_to_quoted/2` also applies to quoted keyword keys
-  * [Code] Ensure bindings with no context are returned as atoms instead of `{binding, nil}` in eval operations
-  * [Inspect] Fix a bug when inspecting a non-binary bitstring with colors
-  * [Kernel] Reject bidirectional formatting characters in strings and comments
-  * [Kernel] Support escaping of terminators in uppercase sigils heredocs for consistency
-  * [Kernel] Raise if `__CALLER__` or `__ENV__` or `__STACKTRACE__` are used in match
-  * [Kernel] Improve error message on invalid argument for `byte_size` from binary concat
-  * [Kernel] Raise when aliasing non-Elixir modules without `:as`
-  * [Kernel] Allow `unquote_splicing` inside `%{...}` without parens
-  * [Kernel] Ensure that waiting on a struct expansion inside a typespec is correctly tracked as waiting time in the compiler
-  * [Kernel] Correctly parse the atom `.` as a keyword list key
-  * [Kernel] Do not leak variables from the first generator in `with` and `for` special forms
-  * [Kernel] Fix column number on strings with NFD characters
-  * [Kernel] Fix a bug where a combination of dynamic line in `quote` with `unquote` of remote calls would emit invalid AST metadata
-  * [OptionParser] Validate switch types/modifiers early on to give more precise feedback
-  * [Protocol] Add `defdelegate` to the list of unallowed macros inside protocols as protocols do not allow function definitions
-  * [Protocol] Warn if `@callback`, `@macrocallback` and `@optional_callbacks` are defined inside protocol
-  * [Protocol] Ensure protocol metadata is deterministic on consolidation
-  * [Range] Always show step when range is descending
-  * [String] Update Unicode database to version 14.0
-  * [URI] Only percent decode if followed by hex digits (according to https://url.spec.whatwg.org/#percent-decode)
-  * [Version] Ensure proper precedence of `and`/`or` in version requirements
-
-#### ExUnit
-
-  * [ExUnit] Fix formatter and counters from `ExUnit.run/0` to consider all tests in a module whenever if a module's `setup_all` fails
-  * [ExUnit] Allow doctests newlines to be terminated by CRLF
-
-#### IEx
-
-  * [IEx] Fix the loss of `.iex.exs` context after a pry session
-  * [IEx] Stop evaluator before exiting IEx server to avoid evaluators leaking
-
-#### Logger
-
-  * [Logger] Raise clear error message for invalid `:compile_time_purge_matching` configuration
-  * [Logger] Fix a bug where Logger would not reset its discard counter under some scenarios
-
-#### Mix
-
-  * [mix compile.elixir] Track transitive runtime dependencies coming from local/path dependencies
-  * [mix compile.elixir] Recompile file if `@external_resource` is deleted
-  * [mix compile.elixir] Print number of compiling files on all compiler cycles. This will make the `Compiling N files (.ex)` show up multiple times if necessary
-  * [mix deps] Raise if local dep is unavailable while compiling
-  * [mix deps.unlock] Fix blank output when unlocking a dependency that is not locked
-  * [mix local.install] Do not respect `MIX_DEPS_PATH` for install commands
-  * [mix release] Improve release scripts by making sure shell errors cascade (this is done by avoiding exporting and defining variables in a single step)
-  * [mix release] Do not boot release if `RELEASE_COOKIE` is empty
-  * [mix release] Allow releases running as a daemon to be restarted
-  * [mix release] Raise proper error message when non-serializable values are in configs
-  * [mix test] Fix coverage engine to also tag `case`, `cond`, and `receive` branches where the right side is a literal
-
-### 3. Soft-deprecations (no warnings emitted)
-
-#### Elixir
-
-  * [Code] Environment options in `Code.eval_quoted/3` and `Code.eval_string/3`, such as `:aliases` and `:tracers`, have been deprecated in favor of passing an environment
-  * [IO] `:all` on `IO.getn` is deprecated in favor of `:eof`
-  * [URI] `URI.parse/1` is deprecated in favor of `URI.new/1` and `URI.new!/1`
-
-#### Mix
-
-  * [mix format] `Mix.Tasks.Format.formatter_opts_for_file/2` is deprecated in favor of `Mix.Tasks.Format.formatter_for_file/2`
-
-### 4. Hard-deprecations
-
-#### Elixir
-
-  * [Code] `Code.cursor_context/2` is deprecated, use `Code.Fragment.cursor_context/2` instead
-  * [Macro] `Macro.to_string/2` is deprecated, use `Macro.to_string/1` instead
-  * [System] `System.get_pid/0` is deprecated, use `System.pid/0` instead
-  * [Version] Using `!` or `!=` in version requirements is deprecated, use `~>` or `>=` instead
-
-#### Mix
-
-  * [mix escript.build] `:strip_beam` option is deprecated in favor of `:strip_beams`
-  * [Mix] `:exit_code` in `Mix.raise/2` has been deprecated in favor of `:exit_status`
-  * [Mix.Config] `Mix.Config` is deprecated in favor of `Config` module
-
-## v1.12
-
-The CHANGELOG for v1.12 releases can be found [in the v1.12 branch](https://github.com/elixir-lang/elixir/blob/v1.12/CHANGELOG.md).
+# v0.6.0 (2012-08-01)
+
+* incompatible changes
+  * [Kernel] Compiled files now follow `Elixir-ModuleName` convention to solve issues with Erlang embedded mode. This removes the `__MAIN__` pseudo-variable as modules are now located inside `Elixir` namespace;
+  * [Kernel] `__using__` callback triggered by `use` now receives just one argument. Caller information can be accessed via macros using `__CALLER__`;
+  * [Module] Removed data functions in favor of unifying the attributes API;
+  * [Kernel] Comprehensions syntax changed to be more compatible with Erlang behavior;
+  * [Kernel] loop and recur were removed in favor of recursion with named functions;
+
+* deprecations
+  * [Access] The semantics of the access protocol were reduced from a broad query API to simple data structure key-based access;
+  * [Module] `Module.add_compile_callback(module, target, callback)` was deprecated in favor of `Module.add_attribute(module, :before_compile, { target, callback })`;
+  * [Module] `Module.function_defined?` was deprecated in favor of `Module.defines?`;
+  * [Module] `Module.defined_functions` was deprecated in favor of `Module.definitions_in`;
+  * [File] `File.read_info` was deprecated in favor of `File.stat`;
+  * [IO] `IO.print` was deprecated in favor of `IO.write`;
+  * [Kernel] Deprecated `__LINE__` and `__FUNCTION__` in favor of `__ENV__.line` and `__ENV__.function`;
+  * [Kernel] Deprecated `in_guard` in favor of `__CALLER__.in_guard?`;
+  * [Kernel] `refer` is deprecated in favor of `alias`;
+  * [ExUnit] Some assertions were deprecated in favor of simply using `assert()`; 
+
+* enhancements
+  * [OptionParser] Make OptionParser public, add support to flags and improved switch parsing;
+  * [Kernel] Operator `!` is now allowed in guard clauses;
+  * [IEx] IEx now provides autocomplete if the OS supports tty;
+  * [IEx] IEx now supports remsh;
+  * [Mix] First Mix public release;
+  * [Regex] Back references are now properly supported;
+  * [IEx] Elixir now defaults to compile with documentation and `d` can be used in IEx to print modules and functions documentation;
+  * [ExUnit] Support setup and teardown callbacks;
+  * [Kernel] Introduced operator `=~` for regular expression matches;
+  * [Kernel] Compiled docs now include the function signature;
+  * [Kernel] `defmodule` do not start a new variable scope, this improves meta-programming capabilities;
+  * [Range] Added a Range module with support to `in` operator (`x in 1..3`) and iterators;
+  * [Enum] Enhanced Enum protocol to support `Enum.count`;
+  * [Module] Added support to `@before_compile` and `@after_compile` callbacks. The first receives the module name while the latter receives the module name and its object code;
+  * [Kernel] quote special form now supports line and unquote as options;
+  * [Record] Allow `Record[_: value]` to set a default value to all records fields, as in Erlang;
+  * [IEx] Functions `c` and `m` are available in IEx to compile and print available module information. Functions `h` and `v` are available to show history and print previous commands values;
+  * [Enum] Optimized functions when a list is given as collection;
+  * [System] Added `System.find_executable`
+  * [Kernel] Document the macro `@` and allow attributes to be read inside functions;
+  * [IO/File] Many improvements to `File` and `IO` modules;
+  * [Macro] Added `Macro.expand`, useful for debugging what a macro expands to;
+  * [Enum] Added `find_index`;
+  * [Record] Records now provide a `to_keywords` function;
+  * [Kernel] Added support to the `%R` sigil. The same as `%r`, but without interpolation or escaping. Both implementations were also optimized to generate the regex at compilation time;
+  * [Kernel] Added `__ENV__` which returns a `Macro.Env` record with information about the compilation environment;
+  * [Kernel] Added `__CALLER__` inside macros which returns a `Macro.Env` record with information about the calling site;
+
+# v0.5.0 (2012-05-24)
+
+* First official release
@@ -1,66 +0,0 @@
-# Code of Conduct
-
-Contact: elixir-lang-conduct@googlegroups.com
-
-## Why have a Code of Conduct?
-
-As contributors and maintainers of this project, we are committed to providing a friendly, safe and welcoming environment for all, regardless of age, disability, gender, nationality, race, religion, sexuality, or similar personal characteristic.
-
-The goal of the Code of Conduct is to specify a baseline standard of behavior so that people with different social values and communication styles can talk about Elixir effectively, productively, and respectfully, even in face of disagreements. The Code of Conduct also provides a mechanism for resolving conflicts in the community when they arise.
-
-## Our Values
-
-These are the values Elixir developers should aspire to:
-
-  * Be friendly and welcoming
-  * Be kind
-    * Remember that people have varying communication styles and that not everyone is using their native language. (Meaning and tone can be lost in translation.)
-    * Interpret the arguments of others in good faith, do not seek to disagree.
-    * When we do disagree, try to understand why.
-  * Be thoughtful
-    * Productive communication requires effort. Think about how your words will be interpreted.
-    * Remember that sometimes it is best to refrain entirely from commenting.
-  * Be respectful
-    * In particular, respect differences of opinion. It is important that we resolve disagreements and differing views constructively.
-  * Be constructive
-    * Avoid derailing: stay on topic; if you want to talk about something else, start a new conversation.
-    * Avoid unconstructive criticism: don't merely decry the current state of affairs; offer — or at least solicit — suggestions as to how things may be improved.
-    * Avoid harsh words and stern tone: we are all aligned towards the well-being of the community and the progress of the ecosystem. Harsh words exclude, demotivate, and lead to unnecessary conflict.
-    * Avoid snarking (pithy, unproductive, sniping comments).
-    * Avoid microaggressions (brief and commonplace verbal, behavioral and environmental indignities that communicate hostile, derogatory or negative slights and insults towards a project, person or group).
-  * Be responsible
-    * What you say and do matters. Take responsibility for your words and actions, including their consequences, whether intended or otherwise.
-
-The following actions are explicitly forbidden:
-
-  * Insulting, demeaning, hateful, or threatening remarks.
-  * Discrimination based on age, disability, gender, nationality, race, religion, sexuality, or similar personal characteristic.
-  * Bullying or systematic harassment.
-  * Unwelcome sexual advances.
-  * Incitement to any of these.
-
-## Where does the Code of Conduct apply?
-
-If you participate in or contribute to the Elixir ecosystem in any way, you are encouraged to follow the Code of Conduct while doing so.
-
-Explicit enforcement of the Code of Conduct applies to the official mediums operated by the Elixir project:
-
-* The [official GitHub projects][1] and code reviews.
-* The official elixir-lang mailing lists.
-* The **[#elixir][2]** IRC channel on [Libera.Chat][3].
-
-Other Elixir activities (such as conferences, meetups, and unofficial forums) are encouraged to adopt this Code of Conduct. Such groups must provide their own contact information.
-
-Project maintainers may block, remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct.
-
-Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by emailing: elixir-lang-conduct@googlegroups.com. All complaints will be reviewed and investigated and will result in a response that is deemed necessary and appropriate to the circumstances. **All reports will be kept confidential**.
-
-**The goal of the Code of Conduct is to resolve conflicts in the most harmonious way possible**. We hope that in most cases issues may be resolved through polite discussion and mutual agreement. Bannings and other forceful measures are to be employed only as a last resort. **Do not** post about the issue publicly or try to rally sentiment against a particular individual or group.
-
-## Acknowledgements
-
-This document was based on the Code of Conduct from the Go project (dated Sep/2021) and the Contributor Covenant (v1.4).
-
-[1]: https://github.com/elixir-lang/
-[2]: https://web.libera.chat/#elixir
-[3]: https://libera.chat/
@@ -0,0 +1,10 @@
+LEGAL NOTICE INFORMATION
+------------------------
+
+All the files in this distribution are covered under either Elixir's
+license (see the file LICENSE) except the files mentioned below that
+contains sections that are under Erlang's License (EPL):
+
+lib/elixir/src/elixir_glob.erl
+lib/elixir/src/elixir_parser.erl (generated by build scripts)
+
@@ -1,176 +1,13 @@
-                                 Apache License
-                           Version 2.0, January 2004
-                        http://www.apache.org/licenses/
+Copyright 2012 Plataformatec.

-   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at

-   1. Definitions.
+      http://www.apache.org/licenses/LICENSE-2.0

-      "License" shall mean the terms and conditions for use, reproduction,
-      and distribution as defined by Sections 1 through 9 of this document.
-
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-
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-      control with that entity. For the purposes of this definition,
-      "control" means (i) the power, direct or indirect, to cause the
-      direction or management of such entity, whether by contract or
-      otherwise, or (ii) ownership of fifty percent (50%) or more of the
-      outstanding shares, or (iii) beneficial ownership of such entity.
-
-      "You" (or "Your") shall mean an individual or Legal Entity
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-      the terms of any separate license agreement you may have executed
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-      defend, and hold each Contributor harmless for any liability
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-
-   END OF TERMS AND CONDITIONS
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
@@ -1,337 +1,103 @@
-PREFIX ?= /usr/local
-TEST_FILES ?= "*_test.exs"
-SHARE_PREFIX ?= $(PREFIX)/share
-MAN_PREFIX ?= $(SHARE_PREFIX)/man
-CANONICAL := 1.13/
-CANONICAL ?= master/
-ELIXIRC := bin/elixirc --ignore-module-conflict $(ELIXIRC_OPTS)
-ERLC := erlc -I lib/elixir/include
-ERL_MAKE := if [ -n "$(ERLC_OPTS)" ]; then ERL_COMPILER_OPTIONS=$(ERLC_OPTS) erl -make; else erl -make; fi
-ERL := erl -I lib/elixir/include -noshell -pa lib/elixir/ebin
-GENERATE_APP := $(CURDIR)/lib/elixir/generate_app.escript
-VERSION := $(strip $(shell cat VERSION))
-Q := @
-LIBDIR := lib
-BINDIR := bin
-INSTALL = install
-INSTALL_DIR = $(INSTALL) -m755 -d
-INSTALL_DATA = $(INSTALL) -m644
-INSTALL_PROGRAM = $(INSTALL) -m755
-GIT_REVISION = $(strip $(shell git rev-parse HEAD 2> /dev/null ))
-GIT_TAG = $(strip $(shell head="$(call GIT_REVISION)"; git tag --points-at $$head 2> /dev/null | tail -1) )
-SOURCE_DATE_EPOCH_PATH = lib/elixir/tmp/ebin_reproducible
-SOURCE_DATE_EPOCH_FILE = $(SOURCE_DATE_EPOCH_PATH)/SOURCE_DATE_EPOCH
+REBAR:=$(shell echo `pwd`/rebar)
+ELIXIRC:=bin/elixirc --ignore-module-conflict $(ELIXIRC_OPTS)
+ERLC:=erlc -I lib/elixir/include
+ERL:=erl -I lib/elixir/include -noshell -env ERL_LIBS $ERL_LIBS:lib
+FULLFLAG:=.full
+VERSION:=0.6.0

-.PHONY: install compile erlang elixir unicode app build_plt clean_plt dialyze test check_reproducible clean clean_residual_files format install_man clean_man docs Docs.zip Precompiled.zip zips
+.PHONY: 1
 .NOTPARALLEL: compile

-#==> Functions
+#==> Templates
+define TASK_TEMPLATE
+$(1): lib/$(1)/ebin/Elixir-$(2).beam lib/$(1)/ebin/$(1).app

-define CHECK_ERLANG_RELEASE
-	erl -noshell -eval '{V,_} = string:to_integer(erlang:system_info(otp_release)), io:fwrite("~s", [is_integer(V) and (V >= 22)])' -s erlang halt | grep -q '^true'; \
-		if [ $$? != 0 ]; then \
-		  echo "At least Erlang/OTP 22.0 is required to build Elixir"; \
-		  exit 1; \
-		fi
-endef
+lib/$(1)/ebin/$(1).app:
+	@ cd lib/$(1) && ../../bin/elixir ../../bin/mix compile.app

-define APP_TEMPLATE
-$(1): lib/$(1)/ebin/Elixir.$(2).beam lib/$(1)/ebin/$(1).app
-
-lib/$(1)/ebin/$(1).app: lib/$(1)/mix.exs
-	$(Q) cd lib/$(1) && ../../bin/elixir -e 'Mix.start(:permanent, [])' -r mix.exs -e 'Mix.Task.run("compile.app", ~w[--compile-path ebin])'
-
-lib/$(1)/ebin/Elixir.$(2).beam: $(wildcard lib/$(1)/lib/*.ex) $(wildcard lib/$(1)/lib/*/*.ex) $(wildcard lib/$(1)/lib/*/*/*.ex)
+lib/$(1)/ebin/Elixir-$(2).beam: $(wildcard lib/$(1)/lib/*.ex) $(wildcard lib/$(1)/lib/*/*.ex) $(wildcard lib/$(1)/lib/*/*/*.ex) $$(FORCE)
 	@ echo "==> $(1) (compile)"
-	@ rm -rf lib/$(1)/ebin
-	$(Q) cd lib/$(1) && ../../$$(ELIXIRC) "lib/**/*.ex" -o ebin
+	@ $$(ELIXIRC) "lib/$(1)/lib/**/*.ex" -o lib/$(1)/ebin

-test_$(1): compile $(1)
-	@ echo "==> $(1) (ex_unit)"
-	$(Q) cd lib/$(1) && ../../bin/elixir -r "test/test_helper.exs" -pr "test/**/$(TEST_FILES)";
-endef
-
-define WRITE_SOURCE_DATE_EPOCH
-$(shell mkdir -p $(SOURCE_DATE_EPOCH_PATH) && bin/elixir -e \
-  'IO.puts System.build_info()[:date] \
-   |> DateTime.from_iso8601() \
-   |> elem(1) \
-   |> DateTime.to_unix()' > $(SOURCE_DATE_EPOCH_FILE))
-endef
-
-define READ_SOURCE_DATE_EPOCH
-$(strip $(shell cat $(SOURCE_DATE_EPOCH_FILE)))
+test_$(1): $(1)
+	@ echo "==> $(1) (exunit)"
+	@ cd lib/$(1) && time ../../bin/elixir -r "test/test_helper.exs" -pr "test/**/*_test.exs"
 endef

 #==> Compilation tasks
+KERNEL:=lib/elixir/ebin/Elixir-Kernel.beam

-APP := lib/elixir/ebin/elixir.app
-PARSER := lib/elixir/src/elixir_parser.erl
-KERNEL := lib/elixir/ebin/Elixir.Kernel.beam
-UNICODE := lib/elixir/ebin/Elixir.String.Unicode.beam
+compile: lib/elixir/src/elixir.app.src erlang elixir

-default: compile
+lib/elixir/src/elixir.app.src: src/elixir.app.src
+	@ rm -rf lib/elixir/src/elixir.app.src
+	@ cp src/elixir.app.src lib/elixir/src/elixir.app.src

-compile: erlang $(APP) elixir
+erlang:
+	@ cd lib/elixir && $(REBAR) compile

-erlang: $(PARSER)
-	$(Q) if [ ! -f $(APP) ]; then $(call CHECK_ERLANG_RELEASE); fi
-	$(Q) cd lib/elixir && mkdir -p ebin && $(ERL_MAKE)
+# We need to compile only EEx (without the app)
+# file so we can compile Mix
+elixir: kernel lib/eex/ebin/Elixir-EEx.beam mix ex_unit eex

-$(PARSER): lib/elixir/src/elixir_parser.yrl
-	$(Q) erlc -o $@ +'{verbose,true}' +'{report,true}' $<
-
-# Since Mix depends on EEx and EEx depends on Mix,
-# we first compile EEx without the .app file,
-# then Mix, and then compile EEx fully
-elixir: stdlib lib/eex/ebin/Elixir.EEx.beam mix ex_unit logger eex iex
-
-stdlib: $(KERNEL) VERSION
-$(KERNEL): lib/elixir/lib/*.ex lib/elixir/lib/*/*.ex lib/elixir/lib/*/*/*.ex
-	$(Q) if [ ! -f $(KERNEL) ]; then \
-		echo "==> bootstrap (compile)"; \
-		$(ERL) -s elixir_compiler bootstrap -s erlang halt; \
+kernel: $(KERNEL)
+$(KERNEL): lib/elixir/lib/*.ex lib/elixir/lib/*/*.ex $(FORCE)
+	@ if [ -f $(KERNEL) ]; then                                 \
+		echo "==> kernel (compile)";                            \
+		$(ELIXIRC) "lib/elixir/lib/**/*.ex" -o lib/elixir/ebin; \
+	else                                                        \
+		echo "==> bootstrap (compile)";                         \
+		$(ERL) -s elixir_compiler core -s erlang halt;          \
 	fi
-	$(Q) $(MAKE) unicode
-	@ echo "==> elixir (compile)";
-	$(Q) cd lib/elixir && ../../$(ELIXIRC) "lib/**/*.ex" -o ebin;
-	$(Q) $(MAKE) app
+	@ rm -rf lib/elixir/ebin/elixir.app
+	@ cd lib/elixir && $(REBAR) compile

-app: $(APP)
-$(APP): lib/elixir/src/elixir.app.src lib/elixir/ebin VERSION $(GENERATE_APP)
-	$(Q) $(GENERATE_APP) $< $@ $(VERSION)
-
-unicode: $(UNICODE)
-$(UNICODE): lib/elixir/unicode/*
-	@ echo "==> unicode (compile)";
-	$(Q) $(ELIXIRC) lib/elixir/unicode/unicode.ex -o lib/elixir/ebin;
-	$(Q) $(ELIXIRC) lib/elixir/unicode/tokenizer.ex -o lib/elixir/ebin;
-
-$(eval $(call APP_TEMPLATE,ex_unit,ExUnit))
-$(eval $(call APP_TEMPLATE,logger,Logger))
-$(eval $(call APP_TEMPLATE,eex,EEx))
-$(eval $(call APP_TEMPLATE,mix,Mix))
-$(eval $(call APP_TEMPLATE,iex,IEx))
-
-install: compile
-	@ echo "==> elixir (install)"
-	$(Q) for dir in lib/*; do \
-		rm -rf $(DESTDIR)$(PREFIX)/$(LIBDIR)/elixir/$$dir/ebin; \
-		$(INSTALL_DIR) "$(DESTDIR)$(PREFIX)/$(LIBDIR)/elixir/$$dir/ebin"; \
-		$(INSTALL_DATA) $$dir/ebin/* "$(DESTDIR)$(PREFIX)/$(LIBDIR)/elixir/$$dir/ebin"; \
-	done
-	$(Q) $(INSTALL_DIR) "$(DESTDIR)$(PREFIX)/$(LIBDIR)/elixir/bin"
-	$(Q) $(INSTALL_PROGRAM) $(filter-out %.ps1, $(filter-out %.bat, $(wildcard bin/*))) "$(DESTDIR)$(PREFIX)/$(LIBDIR)/elixir/bin"
-	$(Q) $(INSTALL_DIR) "$(DESTDIR)$(PREFIX)/$(BINDIR)"
-	$(Q) for file in "$(DESTDIR)$(PREFIX)"/$(LIBDIR)/elixir/bin/*; do \
-		ln -sf "../$(LIBDIR)/elixir/bin/$${file##*/}" "$(DESTDIR)$(PREFIX)/$(BINDIR)/"; \
-	done
-	$(MAKE) install_man
-
-check_reproducible: compile
-	$(Q) echo "==> Checking for reproducible builds..."
-	$(Q) rm -rf lib/*/tmp/ebin_reproducible/
-	$(call WRITE_SOURCE_DATE_EPOCH)
-	$(Q) mkdir -p lib/elixir/tmp/ebin_reproducible/ \
-	              lib/eex/tmp/ebin_reproducible/ \
-	              lib/ex_unit/tmp/ebin_reproducible/ \
-	              lib/iex/tmp/ebin_reproducible/ \
-	              lib/logger/tmp/ebin_reproducible/ \
-	              lib/mix/tmp/ebin_reproducible/
-	$(Q) mv lib/elixir/ebin/* lib/elixir/tmp/ebin_reproducible/
-	$(Q) mv lib/eex/ebin/* lib/eex/tmp/ebin_reproducible/
-	$(Q) mv lib/ex_unit/ebin/* lib/ex_unit/tmp/ebin_reproducible/
-	$(Q) mv lib/iex/ebin/* lib/iex/tmp/ebin_reproducible/
-	$(Q) mv lib/logger/ebin/* lib/logger/tmp/ebin_reproducible/
-	$(Q) mv lib/mix/ebin/* lib/mix/tmp/ebin_reproducible/
-	SOURCE_DATE_EPOCH=$(call READ_SOURCE_DATE_EPOCH) $(MAKE) compile
-	$(Q) echo "Diffing..."
-	$(Q) bin/elixir lib/elixir/diff.exs lib/elixir/ebin/ lib/elixir/tmp/ebin_reproducible/
-	$(Q) bin/elixir lib/elixir/diff.exs lib/eex/ebin/ lib/eex/tmp/ebin_reproducible/
-	$(Q) bin/elixir lib/elixir/diff.exs lib/ex_unit/ebin/ lib/ex_unit/tmp/ebin_reproducible/
-	$(Q) bin/elixir lib/elixir/diff.exs lib/iex/ebin/ lib/iex/tmp/ebin_reproducible/
-	$(Q) bin/elixir lib/elixir/diff.exs lib/logger/ebin/ lib/logger/tmp/ebin_reproducible/
-	$(Q) bin/elixir lib/elixir/diff.exs lib/mix/ebin/ lib/mix/tmp/ebin_reproducible/
-	$(Q) echo "Builds are reproducible"
+$(eval $(call TASK_TEMPLATE,ex_unit,ExUnit))
+$(eval $(call TASK_TEMPLATE,eex,EEx))
+$(eval $(call TASK_TEMPLATE,mix,Mix))

 clean:
+	@ rm -rf .full
+	@ rm -rf lib/*/ebin
+	@ cd lib/elixir && $(REBAR) clean
+
+#==> Release tasks
+$(FULLFLAG): $(wildcard lib/*/ebin/*)
+	make ELIXIRC_OPTS="--debug-info" FORCE=1
+	touch $(FULLFLAG)
+
+zip: $(FULLFLAG)
+	rm -rf v$(VERSION).zip
+	zip -9 -r v$(VERSION).zip bin CHANGELOG.md LEGAL lib/*/ebin LICENSE README.md rel
+
+docs: $(FULLFLAG)
+	mkdir -p ebin
+	rm -rf docs
+	cp -R -f lib/*/ebin/*.beam ./ebin
+	bin/elixir ../exdoc/bin/exdoc
 	rm -rf ebin
-	rm -rf lib/*/ebin
-	rm -rf $(PARSER)
-	$(Q) $(MAKE) clean_residual_files

-clean_elixir:
-	$(Q) rm -f lib/*/ebin/Elixir.*.beam
+release_docs: docs
+	cd ../elixir-lang.github.com && git checkout master
+	rm -rf ../elixir-lang.github.com/docs/master
+	mv output ../elixir-lang.github.com/docs/master

-clean_residual_files:
-	rm -rf lib/*/_build/
-	rm -rf lib/*/tmp/
-	rm -rf lib/elixir/test/ebin/
-	rm -rf lib/mix/test/fixtures/deps_on_git_repo/
-	rm -rf lib/mix/test/fixtures/git_rebar/
-	rm -rf lib/mix/test/fixtures/git_repo/
-	rm -rf lib/mix/test/fixtures/git_sparse_repo/
-	rm -f erl_crash.dump
-	$(Q) $(MAKE) clean_man
+release_erl: $(FULLFLAG)
+	@ rm -rf rel/elixir
+	@ cd rel && ../rebar generate

-#==> Documentation tasks
+#==> Tests tasks
+test: test_erlang test_elixir

-LOGO_PATH = $(shell test -f ../docs/logo.png && echo "--logo ../docs/logo.png")
-SOURCE_REF = $(shell tag="$(call GIT_TAG)" revision="$(call GIT_REVISION)"; echo "$${tag:-$$revision}")
-DOCS_FORMAT = html
-COMPILE_DOCS = CANONICAL=$(CANONICAL) bin/elixir ../ex_doc/bin/ex_doc "$(1)" "$(VERSION)" "lib/$(2)/ebin" --main "$(3)" --source-url "https://github.com/elixir-lang/elixir" --source-ref "$(call SOURCE_REF)" $(call LOGO_PATH) --output doc/$(2) --canonical "https://hexdocs.pm/$(2)/$(CANONICAL)" --homepage-url "https://elixir-lang.org/docs.html" --formatter "$(DOCS_FORMAT)" $(4)
-
-docs: compile ../ex_doc/bin/ex_doc docs_elixir docs_eex docs_mix docs_iex docs_ex_unit docs_logger
-
-docs_elixir: compile ../ex_doc/bin/ex_doc
-	@ echo "==> ex_doc (elixir)"
-	$(Q) rm -rf doc/elixir
-	$(call COMPILE_DOCS,Elixir,elixir,Kernel,--config "lib/elixir/docs.exs")
-
-docs_eex: compile ../ex_doc/bin/ex_doc
-	@ echo "==> ex_doc (eex)"
-	$(Q) rm -rf doc/eex
-	$(call COMPILE_DOCS,EEx,eex,EEx,--config "lib/mix/docs.exs")
-
-docs_mix: compile ../ex_doc/bin/ex_doc
-	@ echo "==> ex_doc (mix)"
-	$(Q) rm -rf doc/mix
-	$(call COMPILE_DOCS,Mix,mix,Mix,--config "lib/mix/docs.exs")
-
-docs_iex: compile ../ex_doc/bin/ex_doc
-	@ echo "==> ex_doc (iex)"
-	$(Q) rm -rf doc/iex
-	$(call COMPILE_DOCS,IEx,iex,IEx,--config "lib/mix/docs.exs")
-
-docs_ex_unit: compile ../ex_doc/bin/ex_doc
-	@ echo "==> ex_doc (ex_unit)"
-	$(Q) rm -rf doc/ex_unit
-	$(call COMPILE_DOCS,ExUnit,ex_unit,ExUnit,--config "lib/mix/docs.exs")
-
-docs_logger: compile ../ex_doc/bin/ex_doc
-	@ echo "==> ex_doc (logger)"
-	$(Q) rm -rf doc/logger
-	$(call COMPILE_DOCS,Logger,logger,Logger,--config "lib/mix/docs.exs")
-
-../ex_doc/bin/ex_doc:
-	@ echo "ex_doc is not found in ../ex_doc as expected. See README for more information."
-	@ false
-
-#==> Zip tasks
-
-Docs.zip: docs
-	rm -f Docs-v$(VERSION).zip
-	zip -9 -r Docs-v$(VERSION).zip CHANGELOG.md doc NOTICE LICENSE README.md
-	@ echo "Docs file created $(CURDIR)/Docs-v$(VERSION).zip"
-
-Precompiled.zip: build_man compile
-	rm -f Precompiled-v$(VERSION).zip
-	zip -9 -r Precompiled-v$(VERSION).zip bin CHANGELOG.md lib/*/ebin lib/*/lib LICENSE man NOTICE README.md VERSION
-	@ echo "Precompiled file created $(CURDIR)/Precompiled-v$(VERSION).zip"
-
-zips: Precompiled.zip Docs.zip
-	@ echo ""
-	@ echo "### Checksums"
-	@ echo ""
-	@ shasum -a 1 < Precompiled-v$(VERSION).zip | sed -e "s/-//" | xargs echo "  * Precompiled.zip SHA1:"
-	@ shasum -a 512 < Precompiled-v$(VERSION).zip | sed -e "s/-//" | xargs echo "  * Precompiled.zip SHA512:"
-	@ shasum -a 1 < Docs-v$(VERSION).zip | sed -e "s/-//" | xargs echo "  * Docs.zip SHA1:"
-	@ shasum -a 512 < Docs-v$(VERSION).zip | sed -e "s/-//" | xargs echo "  * Docs.zip SHA512:"
-	@ echo ""
-
-#==> Test tasks
-
-# If you modify this task, please update .cirrus.yml accordingly
-test: test_formatted test_erlang test_elixir
-
-test_windows: test test_taskkill
-
-test_taskkill:
-	taskkill //IM erl.exe //F //T //FI "MEMUSAGE gt 0"
-	taskkill //IM epmd.exe //F //T //FI "MEMUSAGE gt 0"
-
-TEST_ERL = lib/elixir/test/erlang
-TEST_EBIN = lib/elixir/test/ebin
-TEST_ERLS = $(addprefix $(TEST_EBIN)/, $(addsuffix .beam, $(basename $(notdir $(wildcard $(TEST_ERL)/*.erl)))))
-
-define FORMAT
-	$(Q) if [ "$(OS)" = "Windows_NT" ]; then \
-		cmd //C call ./bin/mix.bat format $(1); \
-	else \
-		bin/elixir bin/mix format $(1); \
-	fi
-endef
-
-format: compile
-	$(call FORMAT)
-
-test_formatted: compile
-	$(call FORMAT,--check-formatted)
-
-test_erlang: compile $(TEST_ERLS)
+test_erlang: compile
 	@ echo "==> elixir (eunit)"
-	$(Q) $(ERL) -pa $(TEST_EBIN) -s test_helper test;
-	@ echo ""
+	@ mkdir -p lib/elixir/test/ebin
+	@ $(ERLC) -pa lib/elixir/ebin -o lib/elixir/test/ebin lib/elixir/test/erlang/*.erl
+	@ time $(ERL) -pa lib/elixir/test/ebin -s test_helper test -s erlang halt
+	@ echo

-$(TEST_EBIN)/%.beam: $(TEST_ERL)/%.erl
-	$(Q) mkdir -p $(TEST_EBIN)
-	$(Q) $(ERLC) -o $(TEST_EBIN) $<
+test_elixir: test_kernel test_mix test_ex_unit test_eex

-test_elixir: test_stdlib test_ex_unit test_logger test_eex test_iex test_mix
-
-test_stdlib: compile
-	@ echo "==> elixir (ex_unit)"
-	$(Q) exec epmd & exit
-	$(Q) if [ "$(OS)" = "Windows_NT" ]; then \
-		cd lib/elixir && cmd //C call ../../bin/elixir.bat -r "test/elixir/test_helper.exs" -pr "test/elixir/**/$(TEST_FILES)"; \
-	else \
-		cd lib/elixir && ../../bin/elixir -r "test/elixir/test_helper.exs" -pr "test/elixir/**/$(TEST_FILES)"; \
-	fi
-
-#==> Dialyzer tasks
-
-DIALYZER_OPTS = --no_check_plt --fullpath -Werror_handling -Wunmatched_returns -Wunderspecs
-PLT = .elixir.plt
-
-$(PLT):
-	@ echo "==> Building PLT with Elixir's dependencies..."
-	$(Q) dialyzer --output_plt $(PLT) --build_plt --apps erts kernel stdlib compiler syntax_tools parsetools tools ssl inets crypto runtime_tools ftp tftp mnesia public_key asn1 hipe sasl
-
-clean_plt:
-	$(Q) rm -f $(PLT)
-
-build_plt: clean_plt $(PLT)
-
-dialyze: compile $(PLT)
-	@ echo "==> Dialyzing Elixir..."
-	$(Q) dialyzer -pa lib/elixir/ebin --plt $(PLT) $(DIALYZER_OPTS) lib/*/ebin
-
-#==> Man page tasks
-
-build_man: man/iex.1 man/elixir.1
-
-man/iex.1:
-	$(Q) cp man/iex.1.in man/iex.1
-	$(Q) sed -i.bak "/{COMMON}/r man/common" man/iex.1
-	$(Q) sed -i.bak "/{COMMON}/d" man/iex.1
-	$(Q) rm -f man/iex.1.bak
-
-man/elixir.1:
-	$(Q) cp man/elixir.1.in man/elixir.1
-	$(Q) sed -i.bak "/{COMMON}/r man/common" man/elixir.1
-	$(Q) sed -i.bak "/{COMMON}/d" man/elixir.1
-	$(Q) rm -f man/elixir.1.bak
-
-clean_man:
-	rm -f man/elixir.1
-	rm -f man/elixir.1.bak
-	rm -f man/iex.1
-	rm -f man/iex.1.bak
-
-install_man: build_man
-	$(Q) mkdir -p $(DESTDIR)$(MAN_PREFIX)/man1
-	$(Q) $(INSTALL_DATA) man/elixir.1  $(DESTDIR)$(MAN_PREFIX)/man1
-	$(Q) $(INSTALL_DATA) man/elixirc.1 $(DESTDIR)$(MAN_PREFIX)/man1
-	$(Q) $(INSTALL_DATA) man/iex.1     $(DESTDIR)$(MAN_PREFIX)/man1
-	$(Q) $(INSTALL_DATA) man/mix.1     $(DESTDIR)$(MAN_PREFIX)/man1
-	$(MAKE) clean_man
+test_kernel: compile
+	@ echo "==> kernel (exunit)"
+	@ cd lib/elixir && time ../../bin/elixir -r "test/elixir/test_helper.exs" -pr "test/elixir/**/*_test.exs"
@@ -1,37 +0,0 @@
-LEGAL NOTICE INFORMATION
------------------------
-
-All the files in this distribution are copyright to the terms below.
-
-== lib/elixir/src/elixir_parser.erl (generated by build scripts)
-
-Copyright Ericsson AB 1996-2015
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    https://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-
-== All other files
-
-Copyright 2012 Plataformatec
-Copyright 2021 The Elixir Team
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-   https://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
@@ -1,234 +1,52 @@
-<img src="https://github.com/elixir-lang/elixir-lang.github.com/raw/master/images/logo/logo.png" width="200" alt="Elixir">
+![Elixir](https://github.com/elixir-lang/elixir-lang.github.com/raw/master/images/logo/logo.png)
+=========
+[![Build Status](https://secure.travis-ci.org/elixir-lang/elixir.png?branch=master "Build Status")](http://travis-ci.org/elixir-lang/elixir)

-[![CI](https://github.com/elixir-lang/elixir/workflows/CI/badge.svg?branch=master)](https://github.com/elixir-lang/elixir/actions?query=branch%3Amaster+workflow%3ACI) [![Build status](https://api.cirrus-ci.com/github/elixir-lang/elixir.svg?branch=master)](https://cirrus-ci.com/github/elixir-lang/elixir)
+For more about Elixir, installation and documentation, [check Elixir's website](http://elixir-lang.org/).

-Elixir is a dynamic, functional language designed for building scalable
-and maintainable applications.
+# Usage

-For more about Elixir, installation and documentation,
-[check Elixir's website](https://elixir-lang.org/).
+If you want to contribute to Elixir or run it from source, clone this repository to your machine, compile and test it:

-## Policies
+    $ git clone https://github.com/elixir-lang/elixir.git
+    $ cd elixir
+    $ make test

-New releases are announced in the [announcement mailing list][8].
-You can subscribe by sending an email to elixir-lang-ann+subscribe@googlegroups.com
-and replying to the confirmation email.
+If tests pass, you are ready to move on to the [Getting Started guide][1] or to try Interactive Elixir by running: `bin/iex` in your terminal.

-All security releases [will be tagged with `[security]`][10]. For more
-information, please read our [Security Policy][9].
+However, if tests fail, it is likely you have an outdated Erlang version (Elixir requires Erlang R15B or later). You can check your Erlang version by calling `erl` in the command line. You will see some information as follow:

-All interactions in our official communication channels follow our
-[Code of Conduct][1].
+    Erlang R15B (erts-5.8.4) [source] [64-bit] [smp:2:2] [rq:2] [async-threads:0] [hipe] [kernel-poll:false]

-## Bug reports
+If you have the correct version and tests still fail, feel free to [open an issue][2].

-For reporting bugs, [visit our issue tracker][2] and follow the steps
-for reporting a new issue. **Please disclose security vulnerabilities
-privately at elixir-security@googlegroups.com**.
+# Contributing

-## Issues tracker management
+If you want to contribute, Elixir code is divided in applications inside the `lib` folder:

-All currently open bugs related to the Elixir repository are listed
-in the issues tracker. The Elixir team uses the issues tracker to focus
-on *actionable items*, including planned enhancements in the short- and
-medium-term. We also do our best to label entries for clarity and to ease
-collaboration.
+* `elixir` - Contains Elixir's kernel and stdlib;

-Our *actionable item policy* has some important consequences, such as:
+* `eex` - Template engine that allows you to embed Elixir;

-  * Proposing new features as well as request for support, help, and
-    guidance must be done in their own spaces, detailed next.
+* `ex_unit` - Simple test framework that ships with Elixir;

-  * Issues where we have identified to be outside of Elixir scope,
-    such as a bug upstream, will be closed (and requested to be moved
-    elsewhere if appropriate).
+We usually keep a list of features and bugs [in the issue tracker][2].

-  * We actively close unrelated and non-actionable issues to keep the
-    issues tracker tidy. However, we may get things wrong from time to
-    time, so we are glad to revisit issues and reopen if necessary.
+# Important links

-Keep the tone positive and be kind! For more information, see the
-[Code of Conduct][1].
+* #elixir-lang on freenode IRC
+* [Website][1]
+* [Issue tracker][2]
+* [Mailing list][3]

-### Proposing new features
-
-For proposing new features, please start a discussion in the
-[Elixir Core mailing list][3]. Keep in mind that it is your responsibility
-to argue and explain why a feature is useful and how it will impact the
-codebase and the community.
-
-Once a proposal is accepted, it will be added to [the issue tracker][2].
-Features and bug fixes that have already been merged and will be included
-in the next release are then "closed" and added to the [changelog][7].
-
-### Discussions, support, and help
-
-For general discussions, support, and help, please use many of the community
-spaces [listed on the sidebar of the Elixir website](https://elixir-lang.org/),
-such as forums, chat platforms, etc, where the wider community will be available
-to help you.
-
-## Compiling from source
-
-For the many different ways to install Elixir,
-[see our installation instructions on the website](https://elixir-lang.org/install.html).
-However, if you want to contribute to Elixir, you will need to compile from source.
-
-First, [install Erlang](https://elixir-lang.org/install.html#installing-erlang).
-After that, clone this repository to your machine, compile and test it:
-
-```sh
-git clone https://github.com/elixir-lang/elixir.git
-cd elixir
-make clean test
-```
-
-> Note: if you are running on Windows,
-[this article includes important notes for compiling Elixir from source
-on Windows](https://github.com/elixir-lang/elixir/wiki/Windows).
-
-In case you want to use this Elixir version as your system version,
-you need to add the `bin` directory to [your PATH environment variable](https://elixir-lang.org/install.html#setting-path-environment-variable).
-
-If Elixir fails to build (specifically when pulling in a new version via
-`git`), be sure to remove any previous build artifacts by running
-`make clean`, then `make test`.
-
-## Contributing
-
-We welcome everyone to contribute to Elixir. To do so, there are a few
-things you need to know about the code. First, Elixir code is divided
-in applications inside the `lib` folder:
-
-* `elixir` - Elixir's kernel and standard library
-
-* `eex` - EEx is the template engine that allows you to embed Elixir
-
-* `ex_unit` - ExUnit is a simple test framework that ships with Elixir
-
-* `iex` - IEx stands for Interactive Elixir: Elixir's interactive shell
-
-* `logger` - Logger is the built-in logger
-
-* `mix` - Mix is Elixir's build tool
-
-You can run all tests in the root directory with `make test` and you can
-also run tests for a specific framework `make test_#{APPLICATION}`, for example,
-`make test_ex_unit`. If you just changed something in the Elixir's standard
-library, you can run only that portion through `make test_stdlib`.
-
-If you are changing just one file, you can choose to compile and run tests only
-for that particular file for fast development cycles. For example, if you
-are changing the String module, you can compile it and run its tests as:
-
-```sh
-bin/elixirc lib/elixir/lib/string.ex -o lib/elixir/ebin
-bin/elixir lib/elixir/test/elixir/string_test.exs
-```
-
-To recompile (including Erlang modules):
-
-```sh
-make compile
-```
-
-After your changes are done, please remember to run `make format` to guarantee
-all files are properly formatted and then run the full suite with
-`make test`.
-
-If your contribution fails during the bootstrapping of the language,
-you can rebuild the language from scratch with:
-
-```sh
-make clean_elixir compile
-```
-
-Similarly, if you can't get Elixir to compile or the tests to pass after
-updating an existing checkout, run `make clean compile`. You can check
-[the official build status](https://github.com/elixir-lang/elixir/actions/workflows/ci.yml).
-More tasks can be found by reading the [Makefile](Makefile).
-
-With tests running and passing, you are ready to contribute to Elixir and
-[send a pull request](https://help.github.com/articles/using-pull-requests/).
-We have saved some excellent pull requests we have received in the past in
-case you are looking for some examples:
-
-* [Implement Enum.member? - Pull request](https://github.com/elixir-lang/elixir/pull/992)
-* [Add String.valid? - Pull request](https://github.com/elixir-lang/elixir/pull/1058)
-* [Implement capture_io for ExUnit - Pull request](https://github.com/elixir-lang/elixir/pull/1059)
-
-### Reviewing changes
-
-Once a pull request is sent, the Elixir team will review your changes.
-We outline our process below to clarify the roles of everyone involved.
-
-All pull requests must be approved by two committers before being merged into
-the repository. If any changes are necessary, the team will leave appropriate
-comments requesting changes to the code. Unfortunately we cannot guarantee a
-pull request will be merged, even when modifications are requested, as the Elixir
-team will re-evaluate the contribution as it changes.
-
-Committers may also push style changes directly to your branch. If you would
-rather manage all changes yourself, you can disable "Allow edits from maintainers"
-feature when submitting your pull request.
-
-The Elixir team may optionally assign someone to review a pull request.
-If someone is assigned, they must explicitly approve the code before
-another team member can merge it.
-
-When the review finishes, your pull request will be squashed and merged
-into the repository. If you have carefully organized your commits and
-believe they should be merged without squashing, please mention it in
-a comment.
-
-## Building documentation
-
-Building the documentation requires [ExDoc](https://github.com/elixir-lang/ex_doc)
-to be installed and built alongside Elixir:
-
-```sh
-# After cloning and compiling Elixir, in its parent directory:
-git clone git://github.com/elixir-lang/ex_doc.git
-cd ex_doc && ../elixir/bin/mix do deps.get, compile
-```
-
-Now go back to Elixir's root directory and run:
-
-```sh
-make docs                  # to generate HTML pages
-make docs DOCS_FORMAT=epub # to generate EPUB documents
-```
-
-This will produce documentation sets for `elixir`, `eex`, `ex_unit`, `iex`, `logger`,
-and `mix` under the `doc` directory. If you are planning to contribute documentation,
-[please check our best practices for writing documentation](https://hexdocs.pm/elixir/writing-documentation.html).
-
-## Development links
-
-  * [Elixir Documentation][6]
-  * [Elixir Core Mailing list (development)][3]
-  * [Announcement mailing list][8]
-  * [Code of Conduct][1]
-  * [Issue tracker][2]
-  * [Changelog][7]
-  * [Security Policy][9]
-  * **[#elixir][4]** on [Libera.Chat][5] IRC
-
-  [1]: CODE_OF_CONDUCT.md
+  [1]: http://elixir-lang.org
  [2]: https://github.com/elixir-lang/elixir/issues
-  [3]: https://groups.google.com/group/elixir-lang-core
-  [4]: https://web.libera.chat/#elixir
-  [5]: https://libera.chat
-  [6]: https://elixir-lang.org/docs.html
-  [7]: CHANGELOG.md
-  [8]: https://groups.google.com/group/elixir-lang-ann
-  [9]: SECURITY.md
-  [10]: https://groups.google.com/forum/#!searchin/elixir-lang-ann/%5Bsecurity%5D%7Csort:date
+  [3]: http://groups.google.com/group/elixir-lang-core

-## License
+# License

-"Elixir" and the Elixir logo are registered trademarks of The Elixir Team.
+"Elixir" and the Elixir logo are copyright (c) 2012 Plataformatec.

-Elixir source code is released under Apache License 2.0.
+Elixir source code is released under Apache 2 License with some parts under Erlang's license (EPL).

-Check [NOTICE](NOTICE) and [LICENSE](LICENSE) files for more information.
+Check LEGAL and LICENSE files for more information.
@@ -1,45 +1,25 @@
-# Release process
+## Release process

-## Shipping a new version
+This document simply outlines the release process:

-1. Ensure you are running on the oldest supported Erlang version
+1) Remove .dev extension from current versions

-2. Update version in /VERSION, bin/elixir and bin/elixir.bat
+2) Run `make clean test` to ensure all tests pass from scratch

-3. Ensure /CHANGELOG.md is updated, versioned and add the current date
+3) Ensure CHANGELOG is updated and tag release version with timestamp in it

-4. Update "Compatibility and Deprecations" if a new OTP version is supported
+4) Commit changes above and tag new version on Git

-5. Commit changes above with title "Release vVERSION" and generate a new tag
+5) Release new docs, update elixir-lang.org

-6. Run `make clean test` to ensure all tests pass from scratch and the CI is green
+6) Push new zip to Elixir's downloads page

-7. Recompile an existing project (for example, Ecto) to ensure manifests can be upgraded
+7) After release, bump versions and add .dev back

-8. Push branch and the new tag
+## Places where version is mentioned

-9. Publish new zips with `make zips`, upload `Precompiled.zip` and `Docs.zip` to GitHub Releases, and include SHAs+CHANGELOG
-
-10. Add the release to `elixir.csv` (all releases), update `erlang.csv` to the precompiled OTP version, and `_data/elixir-versions.yml` (except for RCs) files in `elixir-lang/elixir-lang.github.com`
-
-11. Send an e-mail to elixir-lang-ann@googlegroups.com with title "Elixir vVERSION released". The body should be a link to the Release page on GitHub and the checksums. If it is a security release, prefix the title with the `[security]` tag
-
-## Creating a new vMAJOR.MINOR branch
-
-### In the new branch
-
-1. Set `CANONICAL=` in /Makefile
-
-2. Update tables in /SECURITY.md and "Compatibility and Deprecations"
-
-3. Commit "Branch out vMAJOR.MINOR"
-
-### Back in master
-
-1. Bump /VERSION file, bin/elixir and bin/elixir.bat
-
-2. Start new /CHANGELOG.md
-
-3. Update tables in /SECURITY.md in "Compatibility and Deprecations"
-
-4. Commit "Start vMAJOR.MINOR+1"
+* src/elixir.app.src
+* lib/elixir/lib/system.ex
+* rel/reltool.config
+* Makefile
+* CHANGELOG
@@ -1,23 +0,0 @@
-# Security Policy
-
-## Supported versions
-
-Elixir applies bug fixes only to the latest minor branch. Security patches are available for the last 5 minor branches:
-
-Elixir version | Support
-:------------- | :-----------------------------
-1.13           | Bug fixes and security patches
-1.12           | Security patches only
-1.11           | Security patches only
-1.10           | Security patches only
-1.9            | Security patches only
-
-## Announcements
-
-New releases are announced in the read-only [announcements mailing list](https://groups.google.com/group/elixir-lang-ann). You can subscribe by sending an email to elixir-lang-ann+subscribe@googlegroups.com and replying to the confirmation email.
-
-All security releases [will be tagged with `[security]`](https://groups.google.com/forum/#!searchin/elixir-lang-ann/%5Bsecurity%5D%7Csort:date).
-
-## Reporting a vulnerability
-
-Please disclose security vulnerabilities privately at elixir-security@googlegroups.com
@@ -1 +0,0 @@
-1.13.1
@@ -1,244 +1,71 @@
 #!/bin/sh
-set -e
+if [ $# -eq 0 ]; then
+  echo "Usage: `basename $0` [options] [.exs file] [data]

-ELIXIR_VERSION=1.13.1
+  -v                Prints version and exit
+  -e \"command\"      Evaluates the given command (*)
+  -r \"file\"         Requires the given files/patterns (*)
+  -S \"script\"       Finds and executes the given script (*)
+  -pr \"file\"        Requires the given files/patterns in parallel (*)
+  -pa \"path\"        Prepends the given path to Erlang code path (*)
+  -pz \"path\"        Appends the given path to Erlang code path (*)
+  --erl \"switches\"  Switches to be passed down to erlang
+  --name \"name\"     Makes and assigns a name to the distributed node
+  --sname \"name\"    Makes and assigns a short name to the distributed node
+  --remsh \"name\"    Connects to a node using a remote shell (with iex)
+  --no-halt         Does not halt the Erlang VM after execution

-if [ $# -eq 0 ] || { [ $# -eq 1 ] && { [ "$1" = "--help" ] || [ "$1" = "-h" ]; }; }; then
-  cat <<USAGE >&2
-Usage: $(basename "$0") [options] [.exs file] [data]
-
-## General options
-
-  -e "COMMAND"                 Evaluates the given command (*)
-  -h, --help                   Prints this message (standalone)
-  -r "FILE"                    Requires the given files/patterns (*)
-  -S SCRIPT                    Finds and executes the given script in \$PATH
-  -pr "FILE"                   Requires the given files/patterns in parallel (*)
-  -pa "PATH"                   Prepends the given path to Erlang code path (*)
-  -pz "PATH"                   Appends the given path to Erlang code path (*)
-  -v, --version                Prints Erlang/OTP and Elixir versions (standalone)
-
-  --app APP                    Starts the given app and its dependencies (*)
-  --erl "SWITCHES"             Switches to be passed down to Erlang (*)
-  --eval "COMMAND"             Evaluates the given command, same as -e (*)
-  --logger-otp-reports BOOL    Enables or disables OTP reporting
-  --logger-sasl-reports BOOL   Enables or disables SASL reporting
-  --no-halt                    Does not halt the Erlang VM after execution
-  --short-version              Prints Elixir version (standalone)
-  --werl                       Uses Erlang's Windows shell GUI (Windows only)
-
-Options given after the .exs file or -- are passed down to the executed code.
-Options can be passed to the Erlang runtime using \$ELIXIR_ERL_OPTIONS or --erl.
-
-## Distribution options
-
-The following options are related to node distribution.
-
-  --cookie COOKIE              Sets a cookie for this distributed node
-  --hidden                     Makes a hidden node
-  --name NAME                  Makes and assigns a name to the distributed node
-  --rpc-eval NODE "COMMAND"    Evaluates the given command on the given remote node (*)
-  --sname NAME                 Makes and assigns a short name to the distributed node
-
-## Release options
-
-The following options are generally used under releases.
-
-  --boot "FILE"                Uses the given FILE.boot to start the system
-  --boot-var VAR "VALUE"       Makes \$VAR available as VALUE to FILE.boot (*)
-  --erl-config "FILE"          Loads configuration in FILE.config written in Erlang (*)
-  --pipe-to "PIPEDIR" "LOGDIR" Starts the Erlang VM as a named PIPEDIR and LOGDIR
-  --vm-args "FILE"             Passes the contents in file as arguments to the VM
-
--pipe-to starts Elixir detached from console (Unix-like only).
-It will attempt to create PIPEDIR and LOGDIR if they don't exist.
-See run_erl to learn more. To reattach, run: to_erl PIPEDIR.
-
-** Options marked with (*) can be given more than once.
-** Standalone options can't be combined with other options.
-USAGE
+** Options marked with (*) can be given more than once
+** Options given after the .exs file or -- are passed down to the executed code
+** Options can be passed to the erlang runtime using ELIXIR_ERL_OPTS or --erl" >&2
  exit 1
 fi

 readlink_f () {
  cd "$(dirname "$1")" > /dev/null
-  filename="$(basename "$1")"
+  local filename="$(basename "$1")"
  if [ -h "$filename" ]; then
    readlink_f "$(readlink "$filename")"
  else
-    echo "$(pwd -P)/$filename"
+    echo "`pwd -P`/$filename"
  fi
 }

-if [ $# -eq 1 ] && [ "$1" = "--short-version" ]; then
-  echo "$ELIXIR_VERSION"
-  exit 0
-fi
-
-# Stores static Erlang arguments and --erl (which is passed as is)
 ERL=""
-
-# Stores erl arguments preserving spaces/quotes (mimics an array)
-erl_set () {
-  eval "E${E}=\$1"
-  E=$((E + 1))
-}
-
-# Checks if a string starts with prefix. Usage: starts_with "$STRING" "$PREFIX"
-starts_with () {
-  case $1 in
-    "$2"*) true;;
-    *) false;;
-  esac
-}
-
-ERL_EXEC="erl"
-MODE="elixir"
 I=1
-E=0
-LENGTH=$#
-set -- "$@" -extra

-while [ $I -le $LENGTH ]; do
+while [ $I -le $# ]; do
  S=1
-  case "$1" in
-    +iex)
-        set -- "$@" "$1"
-        MODE="iex"
+  eval "PEEK=\${$I}"
+  case "$PEEK" in
+    -v|--compile|--no-halt)
        ;;
-    +elixirc)
-        set -- "$@" "$1"
-        MODE="elixirc"
-        ;;
-    -v|--no-halt)
-        set -- "$@" "$1"
-        ;;
-    -e|-r|-pr|-pa|-pz|--app|--eval|--remsh|--dot-iex)
+    -e|-r|-pr|-pa|-pz|--remsh|-S)
        S=2
-        set -- "$@" "$1" "$2"
-        ;;
-    --rpc-eval)
-        S=3
-        set -- "$@" "$1" "$2" "$3"
-        ;;
-    --detached)
-        echo "warning: the --detached option is deprecated" >&2
-        ERL="$ERL -detached"
-        ;;
-    --hidden)
-        ERL="$ERL -hidden"
-        ;;
-    --logger-otp-reports)
-        S=2
-        if [ "$2" = 'true' ] || [ "$2" = 'false' ]; then
-          ERL="$ERL -logger handle_otp_reports $2"
-        fi
-        ;;
-    --logger-sasl-reports)
-        S=2
-        if [ "$2" = 'true' ] || [ "$2" = 'false' ]; then
-          ERL="$ERL -logger handle_sasl_reports $2"
-        fi
-        ;;
-    --erl)
-        S=2
-        ERL="$ERL $2"
-        ;;
-    --cookie)
-        S=2
-        erl_set "-setcookie"
-        erl_set "$2"
        ;;
    --sname|--name)
-        S=2
-        erl_set "$(echo "$1" | cut -c 2-)"
-        erl_set "$2"
+        I=$(expr $I + 1)
+        eval "VAL=\${$I}"
+        ERL="$ERL `echo $PEEK | cut -c 2-` "$VAL""
        ;;
-    --erl-config)
-        S=2
-        erl_set "-config"
-        erl_set "$2"
-        ;;
-    --vm-args)
-        S=2
-        erl_set "-args_file"
-        erl_set "$2"
-        ;;
-    --boot)
-        S=2
-        erl_set "-boot"
-        erl_set "$2"
-        ;;
-    --boot-var)
-        S=3
-        erl_set "-boot_var"
-        erl_set "$2"
-        erl_set "$3"
-        ;;
-    --pipe-to)
-        S=3
-        RUN_ERL_PIPE="$2"
-        RUN_ERL_LOG="$3"
-        if [ "$(starts_with "$RUN_ERL_PIPE" "-")" ]; then
-          echo "--pipe-to : PIPEDIR cannot be a switch" >&2 && exit 1
-        elif [ "$(starts_with "$RUN_ERL_LOG" "-")" ]; then
-          echo "--pipe-to : LOGDIR cannot be a switch" >&2 && exit 1
-        fi
-        ;;
-    --werl)
-        if [ "$OS" = "Windows_NT" ]; then ERL_EXEC="werl"; fi
+    --erl)
+        I=$(expr $I + 1)
+        eval "VAL=\${$I}"
+        ERL="$ERL "$VAL""
        ;;
    *)
-        while [ $I -le $LENGTH ]; do
-          I=$((I + 1))
-          set -- "$@" "$1"
-          shift
-        done
        break
        ;;
  esac
-
-  I=$((I + S))
-  shift $S
-done
-
-I=$((E - 1))
-while [ $I -ge 0 ]; do
-  eval "VAL=\$E$I"
-  set -- "$VAL" "$@"
-  I=$((I - 1))
+  I=$(expr $I + $S)
 done

 SELF=$(readlink_f "$0")
 SCRIPT_PATH=$(dirname "$SELF")

-if [ "$OSTYPE" = "cygwin" ]; then SCRIPT_PATH=$(cygpath -m "$SCRIPT_PATH"); fi
-if [ "$MODE" != "iex" ]; then ERL="-noshell -s elixir start_cli $ERL"; fi
-
-if [ "$OS" != "Windows_NT" ] && [ -z "$NO_COLOR" ]; then
-  if test -t 1 -a -t 2; then ERL="-elixir ansi_enabled true $ERL"; fi
-fi
-
-# One MAY change ERTS_BIN= but you MUST NOT change
-# ERTS_BIN=$ERTS_BIN as it is handled by Elixir releases.
-ERTS_BIN=
-ERTS_BIN="$ERTS_BIN"
-
-set -- "$ERTS_BIN$ERL_EXEC" -pa "$SCRIPT_PATH"/../lib/*/ebin $ELIXIR_ERL_OPTIONS $ERL "$@"
-
-if [ -n "$RUN_ERL_PIPE" ]; then
-  ESCAPED=""
-  for PART in "$@"; do
-    ESCAPED="$ESCAPED $(echo "$PART" | sed 's/[^a-zA-Z0-9_\-\/]/\\&/g')"
-  done
-  mkdir -p "$RUN_ERL_PIPE"
-  mkdir -p "$RUN_ERL_LOG"
-  ERL_EXEC="run_erl"
-  set -- "$ERTS_BIN$ERL_EXEC" -daemon "$RUN_ERL_PIPE/" "$RUN_ERL_LOG/" "$ESCAPED"
-fi
-
-if [ -n "$ELIXIR_CLI_DRY_RUN" ]; then
-  echo "$@"
+if [ -f "$SCRIPT_PATH/../releases/RELEASES" ] && [ -f "$SCRIPT_PATH/erl" ]
+then
+  "$SCRIPT_PATH"/erl -env ERL_LIBS $ERL_LIBS:"$SCRIPT_PATH/../lib" -boot elixir -noshell $ELIXIR_ERL_OPTS $ERL -s elixir start_cli -extra "$@"
 else
-  exec "$@"
+  erl -env ERL_LIBS $ERL_LIBS:"$SCRIPT_PATH/../lib" -noshell $ELIXIR_ERL_OPTS $ERL -s elixir start_cli -extra "$@"
 fi
@@ -1,183 +1,22 @@
-@if defined ELIXIR_CLI_ECHO (@echo on) else (@echo off)
-
-set ELIXIR_VERSION=1.13.1
-
-setlocal enabledelayedexpansion
-if    ""%1""==""""                if ""%2""=="""" goto documentation
-if /I ""%1""==""--help""          if ""%2""=="""" goto documentation
-if /I ""%1""==""-h""              if ""%2""=="""" goto documentation
-if /I ""%1""==""/h""              if ""%2""=="""" goto documentation
-if    ""%1""==""/?""              if ""%2""=="""" goto documentation
-if /I ""%1""==""--short-version"" if ""%2""=="""" goto shortversion
-goto parseopts
-
+@echo off
+if "%*" == "" (
+	goto documentation
+) else (
+	goto run 
+) 
 :documentation
 echo Usage: %~nx0 [options] [.exs file] [data]
 echo.
-echo ## General options
+echo  -v              Prints version and exit
+echo  -e command    Evaluates the given command (*)
+echo  -r command    Requires the given file/pattern (*)
+echo  -pr command   Requires the given file/pattern in parallel (*)
+echo  -pa path     Prepend the given path to Erlang code path (*)
+echo  -pz path      Append the given path to Erlang code path (*)
+echo  --no-halt       Do not halt the Erlang VM after execution
 echo.
-echo   -e "COMMAND"                 Evaluates the given command (*)
-echo   -h, --help                   Prints this message (standalone)
-echo   -r "FILE"                    Requires the given files/patterns (*)
-echo   -S SCRIPT                    Finds and executes the given script in $PATH
-echo   -pr "FILE"                   Requires the given files/patterns in parallel (*)
-echo   -pa "PATH"                   Prepends the given path to Erlang code path (*)
-echo   -pz "PATH"                   Appends the given path to Erlang code path (*)
-echo   -v, --version                Prints Erlang/OTP and Elixir versions (standalone)
-echo.
-echo   --app APP                    Starts the given app and its dependencies (*)
-echo   --erl "SWITCHES"             Switches to be passed down to Erlang (*)
-echo   --eval "COMMAND"             Evaluates the given command, same as -e (*)
-echo   --logger-otp-reports BOOL    Enables or disables OTP reporting
-echo   --logger-sasl-reports BOOL   Enables or disables SASL reporting
-echo   --no-halt                    Does not halt the Erlang VM after execution
-echo   --short-version              Prints Elixir version (standalone)
-echo   --werl                       Uses Erlang's Windows shell GUI (Windows only)
-echo.
-echo Options given after the .exs file or -- are passed down to the executed code.
-echo Options can be passed to the Erlang runtime using $ELIXIR_ERL_OPTIONS or --erl.
-echo.
-echo ## Distribution options
-echo.
-echo The following options are related to node distribution.
-echo.
-echo   --cookie COOKIE              Sets a cookie for this distributed node
-echo   --hidden                     Makes a hidden node
-echo   --name NAME                  Makes and assigns a name to the distributed node
-echo   --rpc-eval NODE "COMMAND"    Evaluates the given command on the given remote node (*)
-echo   --sname NAME                 Makes and assigns a short name to the distributed node
-echo.
-echo ## Release options
-echo.
-echo The following options are generally used under releases.
-echo.
-echo   --boot "FILE"                Uses the given FILE.boot to start the system
-echo   --boot-var VAR "VALUE"       Makes $VAR available as VALUE to FILE.boot (*)
-echo   --erl-config "FILE"          Loads configuration in FILE.config written in Erlang (*)
-echo   --vm-args "FILE"             Passes the contents in file as arguments to the VM
-echo.
-echo --pipe-to is not supported on Windows. If set, Elixir won't boot.
-echo.
-echo ** Options marked with (*) can be given more than once.
-echo ** Standalone options can't be combined with other options.
-goto end
-
-:shortversion
-echo !ELIXIR_VERSION!
-goto end
-
-:parseopts
-
-rem Parameters for Elixir
-set parsElixir=
-
-rem Parameters for Erlang
-set parsErlang=
-
-rem Optional parameters before the "-extra" parameter
-set beforeExtra=
-
-rem Option which determines whether the loop is over
-set endLoop=0
-
-rem Designates which mode / Elixir component to run as
-set runMode="elixir"
-
-rem Designates the path to the current script
-set SCRIPT_PATH=%~dp0
-
-rem Designates the path to the ERTS system
-set ERTS_BIN=
-set ERTS_BIN=!ERTS_BIN!
-
-rem Recursive loop called for each parameter that parses the cmd line parameters
-:startloop
-set "par=%~1"
-if "!par!"=="" (
-  rem skip if no parameter
-  goto expand_erl_libs
-)
-shift
-set par="!par:"=\"!"
-if !endLoop! == 1 (
-  set parsElixir=!parsElixir! !par!
-  goto startloop
-)
-rem ******* EXECUTION OPTIONS **********************
-if !par!=="--werl"   (set useWerl=1 && goto startloop)
-if !par!=="+iex"     (set parsElixir=!parsElixir! +iex && set runMode="iex" && goto startloop)
-if !par!=="+elixirc" (set parsElixir=!parsElixir! +elixirc && set runMode="elixirc" && goto startloop)
-rem ******* EVAL PARAMETERS ************************
-if ""==!par:-e=! (
-  set "VAR=%~1"
-  if not defined VAR (set VAR= )
-  set parsElixir=!parsElixir! -e "!VAR:"=\"!"
-  shift
-  goto startloop
-)
-if ""==!par:--eval=! (
-  set "VAR=%~1"
-  if not defined VAR (set VAR= )
-  set parsElixir=!parsElixir! --eval "!VAR:"=\"!"
-  shift
-  goto startloop
-)
-if ""==!par:--rpc-eval=! (
-  set "VAR=%~2"
-  if not defined VAR (set VAR= )
-  set parsElixir=!parsElixir! --rpc-eval %1 "!VAR:"=\"!"
-  shift
-  shift
-  goto startloop
-)
-rem ******* ELIXIR PARAMETERS **********************
-if ""==!par:-r=!          (set "parsElixir=!parsElixir! -r %1" && shift && goto startloop)
-if ""==!par:-pr=!         (set "parsElixir=!parsElixir! -pr %1" && shift && goto startloop)
-if ""==!par:-pa=!         (set "parsElixir=!parsElixir! -pa %1" && shift && goto startloop)
-if ""==!par:-pz=!         (set "parsElixir=!parsElixir! -pz %1" && shift && goto startloop)
-if ""==!par:-v=!          (set "parsElixir=!parsElixir! -v" && goto startloop)
-if ""==!par:--version=!   (set "parsElixir=!parsElixir! --version" && goto startloop)
-if ""==!par:--app=!       (set "parsElixir=!parsElixir! --app %1" && shift && goto startloop)
-if ""==!par:--no-halt=!   (set "parsElixir=!parsElixir! --no-halt" && goto startloop)
-if ""==!par:--remsh=!     (set "parsElixir=!parsElixir! --remsh %1" && shift && goto startloop)
-if ""==!par:--dot-iex=!   (set "parsElixir=!parsElixir! --dot-iex %1" && shift && goto startloop)
-rem ******* ERLANG PARAMETERS **********************
-if ""==!par:--boot=!                (set "parsErlang=!parsErlang! -boot %1" && shift && goto startloop)
-if ""==!par:--boot-var=!            (set "parsErlang=!parsErlang! -boot_var %1 %2" && shift && shift && goto startloop)
-if ""==!par:--cookie=!              (set "parsErlang=!parsErlang! -setcookie %1" && shift && goto startloop)
-if ""==!par:--hidden=!              (set "parsErlang=!parsErlang! -hidden" && goto startloop)
-if ""==!par:--detached=!            (set "parsErlang=!parsErlang! -detached" && echo warning: the --detached option is deprecated && goto startloop)
-if ""==!par:--erl-config=!          (set "parsErlang=!parsErlang! -config %1" && shift && goto startloop)
-if ""==!par:--logger-otp-reports=!  (set "parsErlang=!parsErlang! -logger handle_otp_reports %1" && shift && goto startloop)
-if ""==!par:--logger-sasl-reports=! (set "parsErlang=!parsErlang! -logger handle_sasl_reports %1" && shift && goto startloop)
-if ""==!par:--name=!                (set "parsErlang=!parsErlang! -name %1" && shift && goto startloop)
-if ""==!par:--sname=!               (set "parsErlang=!parsErlang! -sname %1" && shift && goto startloop)
-if ""==!par:--vm-args=!             (set "parsErlang=!parsErlang! -args_file %1" && shift && goto startloop)
-if ""==!par:--erl=!                 (set "beforeExtra=!beforeExtra! %~1" && shift && goto startloop)
-if ""==!par:--pipe-to=!             (echo --pipe-to : Option is not supported on Windows && goto end)
-set endLoop=1
-set parsElixir=!parsElixir! !par!
-goto startloop
-
-:expand_erl_libs
-rem expand all ebin paths as Windows does not support the ..\*\ebin wildcard
-set ext_libs=
-for  /d %%d in ("!SCRIPT_PATH!..\lib\*.") do (
-  set ext_libs=!ext_libs! -pa "%%~fd\ebin"
-)
-
+echo ** Options marked with (*) can be given more than once
+echo ** Options given after the .exs file or -- are passed down to the executed code
+echo ** Options can be passed to the erlang runtime using ELIXIR_ERL_OPTS
 :run
-reg query HKCU\Console /v VirtualTerminalLevel 2>nul | findstr /e "0x1" >nul 2>nul
-if %errorlevel% == 0 (
-  set beforeExtra=-elixir ansi_enabled true !beforeExtra!
-)
-if not !runMode! == "iex" (
-  set beforeExtra=-noshell -s elixir start_cli !beforeExtra!
-)
-if defined useWerl (
-  start "" "!ERTS_BIN!werl.exe" !ext_libs! !ELIXIR_ERL_OPTIONS! !parsErlang! !beforeExtra! -extra !parsElixir!
-) else (
-  "!ERTS_BIN!erl.exe" !ext_libs! !ELIXIR_ERL_OPTIONS! !parsErlang! !beforeExtra! -extra !parsElixir!
-)
-:end
-endlocal
+erl -env ERL_LIBS %ERL_LIBS%;"%~dp0\..\lib" -noshell %ELIXIR_ERL_OPTS% -s elixir start_cli -extra %*
@@ -1,38 +1,27 @@
 #!/bin/sh
-set -e
+if [ $# -eq 0 ]; then
+  echo "Usage: `basename $0` [elixir switches] [compiler switches] [.ex files]

-if [ $# -eq 0 ] || [ "$1" = "--help" ] || [ "$1" = "-h" ]; then
-  cat <<USAGE >&2
-Usage: $(basename "$0") [elixir switches] [compiler switches] [.ex files]
+  -o              The directory to output compiled files
+  --no-docs       Do not attach documentation with compiled code
+  --debug-info    Attach debug info to compiled modules
+  --ignore-module-conflict

-  -h, --help                Prints this message and exits
-  -o                        The directory to output compiled files
-  -v, --version             Prints Elixir version and exits (standalone)
-
-  --ignore-module-conflict  Does not emit warnings if a module was previously defined
-  --no-debug-info           Does not attach debug info to compiled modules
-  --no-docs                 Does not attach documentation to compiled modules
-  --profile time            Profile the time to compile modules
-  --verbose                 Prints compilation status
-  --warnings-as-errors      Treats warnings as errors and return non-zero exit status
-
-Options given after -- are passed down to the executed code.
-Options can be passed to the Erlang runtime using \$ELIXIR_ERL_OPTIONS.
-Options can be passed to the Erlang compiler using \$ERL_COMPILER_OPTIONS.
-USAGE
+** Options given after -- are passed down to the executed code
+** Options can be passed to the erlang runtime using ELIXIR_ERL_OPTS" >&2
  exit 1
 fi

 readlink_f () {
  cd "$(dirname "$1")" > /dev/null
-  filename="$(basename "$1")"
+  local filename="$(basename "$1")"
  if [ -h "$filename" ]; then
    readlink_f "$(readlink "$filename")"
  else
-    echo "$(pwd -P)/$filename"
+    echo "`pwd -P`/$filename"
  fi
 }

 SELF=$(readlink_f "$0")
 SCRIPT_PATH=$(dirname "$SELF")
-exec "$SCRIPT_PATH"/elixir +elixirc "$@"
+"$SCRIPT_PATH"/elixir --compile "$@"
@@ -1,37 +1,22 @@
-@if defined ELIXIR_CLI_ECHO (@echo on) else (@echo off)
-setlocal
-set argc=0
-for %%A in (%*) do (
-  if /I "%%A"=="--help" goto documentation
-  if /I "%%A"=="-h"     goto documentation
-  if /I "%%A"=="/h"     goto documentation
-  if    "%%A"=="/?"     goto documentation
-  set /A argc+=1
-)
-if %argc%==0 goto documentation
-goto run
-
+@echo off
+if "%*" == "" (
+	goto documentation
+) else (
+	goto run 
+) 
 :documentation
-echo Usage: %~nx0 [elixir switches] [compiler switches] [.ex files]
+echo Usage: %~nx0 [switches] [.ex files]
 echo.
-echo   -h, --help                Prints this message and exits
-echo   -o                        The directory to output compiled files
-echo   -v, --version             Prints Elixir version and exits (standalone)
-echo.
-echo   --ignore-module-conflict  Does not emit warnings if a module was previously defined
-echo   --no-debug-info           Does not attach debug info to compiled modules
-echo   --no-docs                 Does not attach documentation to compiled modules
-echo   --profile time            Profile the time to compile modules
-echo   --verbose                 Prints compilation status
-echo   --warnings-as-errors      Treats warnings as errors and returns non-zero exit status
+echo  -v              Prints version and exit
+echo  -o              The directory to output compiled files
+echo  -pa path      Prepend the given path to Erlang code path (*)
+echo  -pz path      Append the given path to Erlang code path (*)
+echo  --no-docs       Do not attach documentation with compiled code
+echo  --debug-info    Attach debug info to compiled modules
+echo  --ignore-module-conflict
 echo.
+echo ** Options marked with (*) can be given more than once
 echo ** Options given after -- are passed down to the executed code
-echo ** Options can be passed to the Erlang runtime using ELIXIR_ERL_OPTIONS
-echo ** Options can be passed to the Erlang compiler using ERL_COMPILER_OPTIONS
-goto end
-
+echo ** Options can be passed to the erlang runtime using ELIXIR_ERL_OPTS" >&2
 :run
-call "%~dp0\elixir.bat" +elixirc %*
-
-:end
-endlocal
+call "%~dp0\elixir.bat" --compile %*
@@ -1,31 +1,14 @@
 #!/bin/sh
-set -e
-
-if [ "$1" = "--help" ] || [ "$1" = "-h" ]; then
-  cat <<USAGE >&2
-Usage: $(basename "$0") [options] [.exs file] [data]
-
-The following options are exclusive to IEx:
-
-  --dot-iex "PATH"    Overrides default .iex.exs file and uses path instead;
-                      path can be empty, then no file will be loaded
-  --remsh NAME        Connects to a node using a remote shell
-
-It accepts all other options listed by "elixir --help".
-USAGE
-  exit 1
-fi
-
 readlink_f () {
  cd "$(dirname "$1")" > /dev/null
-  filename="$(basename "$1")"
+  local filename="$(basename "$1")"
  if [ -h "$filename" ]; then
    readlink_f "$(readlink "$filename")"
  else
-    echo "$(pwd -P)/$filename"
+    echo "`pwd -P`/$filename"
  fi
 }

 SELF=$(readlink_f "$0")
 SCRIPT_PATH=$(dirname "$SELF")
-exec "$SCRIPT_PATH"/elixir --no-halt --erl "-noshell -user Elixir.IEx.CLI" +iex "$@"
+"$SCRIPT_PATH"/elixir --no-halt -e "IEx.cli" "$@"
@@ -1,27 +1,2 @@
-@if defined ELIXIR_CLI_ECHO (@echo on) else (@echo off)
-setlocal
-if /I ""%1""==""--help"" goto documentation
-if /I ""%1""==""-h""     goto documentation
-if /I ""%1""==""/h""     goto documentation
-if    ""%1""==""/?""     goto documentation
-goto run
-
-:documentation
-echo Usage: %~nx0 [options] [.exs file] [data]
-echo.
-echo The following options are exclusive to IEx:
-echo.
-echo   --dot-iex "PATH"    Overrides default .iex.exs file and uses path instead;
-echo                       path can be empty, then no file will be loaded
-echo   --remsh NAME        Connects to a node using a remote shell
-echo   --werl              Uses Erlang's Windows shell GUI (Windows only)
-echo.
-echo Set the IEX_WITH_WERL environment variable to always use werl.
-echo It accepts all other options listed by "elixir --help".
-goto end
-
-:run
-if defined IEX_WITH_WERL (@set __ELIXIR_IEX_FLAGS=--werl) else (set __ELIXIR_IEX_FLAGS=)
-call "%~dp0\elixir.bat" --no-halt --erl "-noshell -user Elixir.IEx.CLI" +iex %__ELIXIR_IEX_FLAGS% %*
-:end
-endlocal
+@echo off
+call "%~dp0\elixir.bat" --no-halt -e "IEx.cli" %*
@@ -1,3 +1,3 @@
 #!/usr/bin/env elixir
-Mix.start()
-Mix.CLI.main()
+Mix.start
+Mix.CLI.run
@@ -1,2 +1,2 @@
-@if defined ELIXIR_CLI_ECHO (@echo on) else (@echo off)
-call "%~dp0\elixir.bat" "%~dp0\mix" %*
+@echo off
+call "%~dp0\elixir.bat" "%~dp0\mix" %*
@@ -1,23 +0,0 @@
-# Store path to mix.bat as a FileInfo object
-$mixBatPath = (Get-ChildItem (((Get-ChildItem $MyInvocation.MyCommand.Path).Directory.FullName) + '\mix.bat'))
-$newArgs = @()
-
-for ($i = 0; $i -lt $args.length; $i++)
-{
-  if ($args[$i] -is [array])
-  {
-    # Commas created the array so we need to reintroduce those commas
-    for ($j = 0; $j -lt $args[$i].length - 1; $j++)
-    {
-      $newArgs += ($args[$i][$j] + ',')
-    }
-    $newArgs += $args[$i][-1]
-  }
-  else
-  {
-    $newArgs += $args[$i]
-  }
-}
-
-# Corrected arguments are ready to pass to batch file
-& $mixBatPath $newArgs
@@ -1,57 +1,31 @@
-defmodule EEx.SyntaxError do
-  defexception [:message, :file, :line, :column]
-
-  @impl true
-  def message(exception) do
-    "#{exception.file}:#{exception.line}:#{exception.column}: #{exception.message}"
-  end
-end
+defexception EEx.SyntaxError, message: nil

 defmodule EEx do
-  @moduledoc ~S"""
+  @moduledoc %B"""
  EEx stands for Embedded Elixir. It allows you to embed
-  Elixir code inside a string in a robust way.
+  Elixir code inside a string in a robust way:

-      iex> EEx.eval_string("foo <%= bar %>", bar: "baz")
-      "foo baz"
+      EEx.eval_string "foo <%= bar %>", [bar: "baz"]
+      #=> "foo baz"

  ## API

-  This module provides three main APIs for you to use:
+  This module provides 3 main APIs for you to use:

-    1. Evaluate a string (`eval_string/3`) or a file (`eval_file/3`)
-       directly. This is the simplest API to use but also the
-       slowest, since the code is evaluated at runtime and not precompiled.
+  1) Evaluate a string (`eval_string`) or a file (`eval_file`)
+     directly. This is the simplest API to use but also the
+     slowest, since the code is evaluated and not compiled before;

-    2. Define a function from a string (`function_from_string/5`)
-       or a file (`function_from_file/5`). This allows you to embed
-       the template as a function inside a module which will then
-       be compiled. This is the preferred API if you have access
-       to the template at compilation time.
+  2) Define a function from a string (`function_from_string`)
+     or a file (`function_from_file`). This allows you to embed
+     the template as a function inside a module which will then
+     be compiled. This is the preferred API if you have access
+     to the template at compilation time;

-    3. Compile a string (`compile_string/2`) or a file (`compile_file/2`)
-       into Elixir syntax tree. This is the API used by both functions
-       above and is available to you if you want to provide your own
-       ways of handling the compiled template.
-
-  ## Options
-
-  All functions in this module accept EEx-related options.
-  They are:
-
-    * `:file` - the file to be used in the template. Defaults to the given
-      file the template is read from or to `"nofile"` when compiling from a string.
-    * `:line` - the line to be used as the template start. Defaults to `1`.
-    * `:indentation` - (since v1.11.0) an integer added to the column after every
-      new line. Defaults to `0`.
-    * `:engine` - the EEx engine to be used for compilation.
-    * `:trim` - if `true`, trims whitespace left and right of quotation as
-      long as at least one newline is present. All subsequent newlines and
-      spaces are removed but one newline is retained. Defaults to `false`.
-    * `:parser_options` - (since: 1.13.0) allow customizing the parsed code that is generated.
-      See `Code.string_to_quoted/2` for available options. Note that the options
-      `:file`, `:line` and `:column` are ignored if passed in.
-      Defaults to `Code.get_compiler_option(:parser_options)` (which defaults to `[]` if not set).
+  3) Compile a string (`compile_string`) or a file (`compile_file`)
+     into Elixir syntax tree. This is the API used by both functions
+     above and is available to you if you want to provide your own
+     ways of handling the compiled template.

  ## Engine

@@ -67,14 +41,12 @@ defmodule EEx do

      <% Elixir expression - inline with output %>
      <%= Elixir expression - replace with result %>
-      <%% EEx quotation - returns the contents inside %>
-      <%# Comments - they are discarded from source %>

  All expressions that output something to the template
  **must** use the equals sign (`=`). Since everything in
-  Elixir is an expression, there are no exceptions for this rule.
-  For example, while some template languages would special-case
-  `if` clauses, they are treated the same in EEx and
+  Elixir is a macro, there are no exceptions for this rule.
+  For example, while some template languages would special-
+  case `if` clauses, they are treated the same in EEx and
  also require `=` in order to have their result printed:

      <%= if true do %>
@@ -83,13 +55,7 @@ defmodule EEx do
        This will never appear
      <% end %>

-  To escape an EEx expression in EEx use `<%% content %>`. For example:
-
-      <%%= x + 3 %>
-
-  will be rendered as `<%= x + 3 %>`.
-
-  Note that different engines may have different rules
+  Notice that different engines may have different rules
  for each tag. Other tags may be added in future versions.

  ### Macros
@@ -98,57 +64,45 @@ defmodule EEx do
  An example is the `@` macro which allows easy data access
  in a template:

-      iex> EEx.eval_string("<%= @foo %>", assigns: [foo: 1])
-      "1"
+      EEx.eval_string "<%= @foo %>", assigns: [foo: 1]
+      #=> 1

-  In other words, `<%= @foo %>` translates to:
+  In other words, <%= @foo %> is simply translated to:

-      <%= {:ok, v} = Access.fetch(assigns, :foo); v %>
+      <%= Keyword.get assigns, :foo %>

-  The `assigns` extension is useful when the number of variables
+  The assigns extension is useful when the number of variables
  required by the template is not specified at compilation time.
  """

  @doc """
-  Generates a function definition from the given string.
-
-  The first argument is the kind of the generated function (`:def` or `:defp`).
-  The `name` argument is the name that the generated function will have.
-  `template` is the string containing the EEx template. `args` is a list of arguments
-  that the generated function will accept. They will be available inside the EEx
-  template. `options` is a list of EEx compilation options (see the module documentation).
+  Generates a function definition from the string.
+  The kind (`:def` or `:defp`) must be given, the
+  function name, its arguments and the compilation options.

  ## Examples

-      iex> defmodule Sample do
-      ...>   require EEx
-      ...>   EEx.function_from_string(:def, :sample, "<%= a + b %>", [:a, :b])
-      ...> end
-      iex> Sample.sample(1, 2)
-      "3"
+      defmodule Sample do
+        require EEx
+        EEx.function_from_string :def, :sample, "<%= a + b %>", [:a, :b]
+      end
+
+      Sample.sample(1, 2) #=> "3"

  """
-  defmacro function_from_string(kind, name, template, args \\ [], options \\ []) do
-    quote bind_quoted: binding() do
-      info = Keyword.merge([file: __ENV__.file, line: __ENV__.line], options)
-      args = Enum.map(args, fn arg -> {arg, [line: info[:line]], nil} end)
-      compiled = EEx.compile_string(template, info)
-
-      case kind do
-        :def -> def unquote(name)(unquote_splicing(args)), do: unquote(compiled)
-        :defp -> defp unquote(name)(unquote_splicing(args)), do: unquote(compiled)
-      end
+  defmacro function_from_string(kind, name, source, args // [], options // []) do
+    info = [file: __CALLER__.file, line: __CALLER__.line + 1]
+    quote do
+      info = Keyword.merge unquote(info), unquote(options)
+      EEx.function_from_quoted(__MODULE__, unquote(kind), unquote(name),
+        unquote(args), EEx.compile_string(unquote(source), info), info)
    end
  end

  @doc """
  Generates a function definition from the file contents.
-
-  The first argument is the kind of the generated function (`:def` or `:defp`).
-  The `name` argument is the name that the generated function will have.
-  `file` is the path to the EEx template file. `args` is a list of arguments
-  that the generated function will accept. They will be available inside the EEx
-  template. `options` is a list of EEx compilation options (see the module documentation).
+  The kind (`:def` or `:defp`) must be given, the
+  function name, its arguments and the compilation options.

  This function is useful in case you have templates but
  you want to precompile inside a module for speed.
@@ -161,129 +115,87 @@ defmodule EEx do
      # sample.ex
      defmodule Sample do
        require EEx
-        EEx.function_from_file(:def, :sample, "sample.eex", [:a, :b])
+        EEx.function_from_file :def, :sample, "sample.eex", [:a, :b]
      end

      # iex
-      Sample.sample(1, 2)
-      #=> "3"
+      Sample.sample(1, 2) #=> "3"

  """
-  defmacro function_from_file(kind, name, file, args \\ [], options \\ []) do
-    quote bind_quoted: binding() do
-      info = Keyword.merge([file: IO.chardata_to_string(file), line: 1], options)
-      args = Enum.map(args, fn arg -> {arg, [line: 1], nil} end)
-      compiled = EEx.compile_file(file, info)
+  defmacro function_from_file(kind, name, filename, args // [], options // []) do
+    quote do
+      file = unquote(filename)
+      info = Keyword.merge unquote(options), [file: file, line: 1]

-      @external_resource file
      @file file
-      case kind do
-        :def -> def unquote(name)(unquote_splicing(args)), do: unquote(compiled)
-        :defp -> defp unquote(name)(unquote_splicing(args)), do: unquote(compiled)
-      end
+      EEx.function_from_quoted(__MODULE__, unquote(kind), unquote(name),
+        unquote(args), EEx.compile_file(file, info), info)
    end
  end

  @doc """
-  Gets a string `source` and generates a quoted expression
+  Get a string `source` and generate a quoted expression
  that can be evaluated by Elixir or compiled to a function.
-
-  This is useful if you want to compile a EEx template into code and inject
-  that code somewhere or evaluate it at runtime.
-
-  The generated quoted code will use variables defined in the template that
-  will be taken from the context where the code is evaluated. If you
-  have a template such as `<%= a + b %>`, then the returned quoted code
-  will use the `a` and `b` variables in the context where it's evaluated. See
-  examples below.
-
-  ## Examples
-
-      iex> quoted = EEx.compile_string("<%= a + b %>")
-      iex> {result, _bindings} = Code.eval_quoted(quoted, a: 1, b: 2)
-      iex> result
-      "3"
-
  """
-  @spec compile_string(String.t(), keyword) :: Macro.t()
-  def compile_string(source, options \\ []) when is_binary(source) and is_list(options) do
+  def compile_string(source, options // []) do
    EEx.Compiler.compile(source, options)
  end

  @doc """
-  Gets a `filename` and generates a quoted expression
+  Get a `filename` and generate a quoted expression
  that can be evaluated by Elixir or compiled to a function.
-
-  This is useful if you want to compile a EEx template into code and inject
-  that code somewhere or evaluate it at runtime.
-
-  The generated quoted code will use variables defined in the template that
-  will be taken from the context where the code is evaluated. If you
-  have a template such as `<%= a + b %>`, then the returned quoted code
-  will use the `a` and `b` variables in the context where it's evaluated. See
-  examples below.
-
-  ## Examples
-
-      # sample.eex
-      <%= a + b %>
-
-      # In code:
-      quoted = EEx.compile_file("sample.eex")
-      {result, _bindings} = Code.eval_quoted(quoted, a: 1, b: 2)
-      result
-      #=> "3"
-
  """
-  @spec compile_file(Path.t(), keyword) :: Macro.t()
-  def compile_file(filename, options \\ []) when is_list(options) do
-    filename = IO.chardata_to_string(filename)
-    options = Keyword.merge([file: filename, line: 1], options)
+  def compile_file(filename, options // []) do
+    options = Keyword.merge options, [file: filename, line: 1]
    compile_string(File.read!(filename), options)
  end

  @doc """
-  Gets a string `source` and evaluate the values using the `bindings`.
+  Get a string `source` and evaluate the values using the `bindings`.

  ## Examples

-      iex> EEx.eval_string("foo <%= bar %>", bar: "baz")
-      "foo baz"
+      EEx.eval_string "foo <%= bar %>", [bar: "baz"]
+      #=> "foo baz"

  """
-  @spec eval_string(String.t(), keyword, keyword) :: String.t()
-  def eval_string(source, bindings \\ [], options \\ [])
-      when is_binary(source) and is_list(bindings) and is_list(options) do
+  def eval_string(source, bindings // [], options // []) do
    compiled = compile_string(source, options)
    do_eval(compiled, bindings, options)
  end

  @doc """
-  Gets a `filename` and evaluate the values using the `bindings`.
+  Get a `filename` and evaluate the values using the `bindings`.

  ## Examples

-      # sample.eex
+      # sample.ex
      foo <%= bar %>

-      # IEx
-      EEx.eval_file("sample.eex", bar: "baz")
+      # iex
+      EEx.eval_file "sample.ex", [bar: "baz"]
      #=> "foo baz"

  """
-  @spec eval_file(Path.t(), keyword, keyword) :: String.t()
-  def eval_file(filename, bindings \\ [], options \\ [])
-      when is_list(bindings) and is_list(options) do
-    filename = IO.chardata_to_string(filename)
-    options = Keyword.put_new(options, :file, filename)
+  def eval_file(filename, bindings // [], options // []) do
+    options  = Keyword.put options, :file, filename
    compiled = compile_file(filename, options)
    do_eval(compiled, bindings, options)
  end

  ### Helpers

+  @doc false
+  def function_from_quoted(module, kind, name, args, source, info) do
+    args  = Enum.map args, fn arg -> { arg, 0, nil } end
+    quote = quote do
+      unquote(kind).(unquote(name).(unquote_splicing(args)), do: unquote(source))
+    end
+    Module.eval_quoted module, quote, [], info
+  end
+
  defp do_eval(compiled, bindings, options) do
-    {result, _} = Code.eval_quoted(compiled, bindings, options)
+    { result, _ } = Code.eval_quoted(compiled, bindings, options)
    result
  end
 end
@@ -1,245 +1,117 @@
+defrecord EEx.State, engine: EEx.SmartEngine, dict: [], file: 'nofile', line: 1, start_line: 1
+
 defmodule EEx.Compiler do
  @moduledoc false

-  # When changing this setting, don't forget to update the docs for EEx
-  @default_engine EEx.SmartEngine
-
  @doc """
  This is the compilation entry point. It glues the tokenizer
  and the engine together by handling the tokens and invoking
  the engine every time a full expression or text is received.
  """
-  @spec compile(String.t(), keyword) :: Macro.t()
-  def compile(source, opts) when is_binary(source) and is_list(opts) do
-    file = opts[:file] || "nofile"
-    line = opts[:line] || 1
-    column = 1
-    indentation = opts[:indentation] || 0
-    trim = opts[:trim] || false
-    parser_options = opts[:parser_options] || Code.get_compiler_option(:parser_options)
-    tokenizer_options = %{trim: trim, indentation: indentation}
-
-    case EEx.Tokenizer.tokenize(source, line, column, tokenizer_options) do
-      {:ok, tokens} ->
-        state = %{
-          engine: opts[:engine] || @default_engine,
-          file: file,
-          line: line,
-          quoted: [],
-          start_line: nil,
-          start_column: nil,
-          parser_options: parser_options
-        }
-
-        init = state.engine.init(opts)
-        generate_buffer(tokens, init, [], state)
-
-      {:error, line, column, message} ->
-        raise EEx.SyntaxError, file: file, line: line, column: column, message: message
-    end
+  def compile(source, options) do
+    line   = Keyword.get(options, :line, 1)
+    tokens = EEx.Tokenizer.tokenize(source, line)
+    state  = EEx.State.new(options)
+    generate_buffer(tokens, "", [], state)
  end

-  # Generates the buffers by handling each expression from the tokenizer.
-  # It returns Macro.t/0 or it raises.
+  # Generates the buffers by handling each expression from the tokenizer

-  defp generate_buffer([{:text, line, column, chars} | rest], buffer, scope, state) do
-    buffer =
-      if function_exported?(state.engine, :handle_text, 3) do
-        meta = [line: line, column: column]
-        state.engine.handle_text(buffer, meta, IO.chardata_to_string(chars))
-      else
-        # TODO: Remove this branch on Elixir v2.0
-        state.engine.handle_text(buffer, IO.chardata_to_string(chars))
-      end
-
-    generate_buffer(rest, buffer, scope, state)
+  defp generate_buffer([{ :text, _line, chars }|t], buffer, scope, state) do
+    buffer = state.engine.handle_text(buffer, chars)
+    generate_buffer(t, buffer, scope, state)
  end

-  defp generate_buffer([{:expr, line, column, mark, chars} | rest], buffer, scope, state) do
-    options = [file: state.file, line: line, column: column(column, mark)] ++ state.parser_options
-    expr = Code.string_to_quoted!(chars, options)
-    buffer = state.engine.handle_expr(buffer, IO.chardata_to_string(mark), expr)
-    generate_buffer(rest, buffer, scope, state)
+  defp generate_buffer([{ :expr, line, mark, chars }|t], buffer, scope, state) do
+    expr = maybe_block Erlang.elixir_translator.forms(chars, line, state.file)
+    buffer = state.engine.handle_expr(buffer, mark, expr)
+    generate_buffer(t, buffer, scope, state)
  end

-  defp generate_buffer(
-         [{:start_expr, start_line, start_column, mark, chars} | rest],
-         buffer,
-         scope,
-         state
-       ) do
-    if mark != '=' do
-      message =
-        "the contents of this expression won't be output unless the EEx block starts with \"<%=\""
-
-      :elixir_errors.erl_warn({start_line, start_column}, state.file, message)
-    end
-
-    {rest, line, contents} =
-      look_ahead_middle(rest, start_line, chars) || {rest, start_line, chars}
-
-    {contents, rest} =
-      generate_buffer(
-        rest,
-        state.engine.handle_begin(buffer),
-        [contents | scope],
-        %{
-          state
-          | quoted: [],
-            line: line,
-            start_line: start_line,
-            start_column: column(start_column, mark)
-        }
-      )
-
-    buffer = state.engine.handle_expr(buffer, IO.chardata_to_string(mark), contents)
-    generate_buffer(rest, buffer, scope, state)
+  defp generate_buffer([{ :start_expr, line, mark, chars }|t], buffer, scope, state) do
+    { contents, t } = generate_buffer(t, "", [chars|scope], state.dict([]).line(line).start_line(line))
+    buffer = state.engine.handle_expr(buffer, mark, contents)
+    generate_buffer(t, buffer, scope, state.dict([]))
  end

-  defp generate_buffer(
-         [{:middle_expr, line, _column, '', chars} | rest],
-         buffer,
-         [current | scope],
-         state
-       ) do
-    {wrapped, state} = wrap_expr(current, line, buffer, chars, state)
-    state = %{state | line: line}
-    generate_buffer(rest, state.engine.handle_begin(buffer), [wrapped | scope], state)
+  defp generate_buffer([{ :middle_expr, line, _, chars }|t], buffer, [current|scope], state) do
+    { wrapped, state } = wrap_expr(current, line, buffer, chars, state)
+    generate_buffer(t, "", [wrapped|scope], state.line(line))
  end

-  defp generate_buffer(
-         [{:middle_expr, line, column, modifier, chars} | t],
-         buffer,
-         [_ | _] = scope,
-         state
-       ) do
-    message =
-      "unexpected beginning of EEx tag \"<%#{modifier}\" on \"<%#{modifier}#{chars}%>\", " <>
-        "please remove \"#{modifier}\" accordingly"
-
-    :elixir_errors.erl_warn({line, column}, state.file, message)
-    generate_buffer([{:middle_expr, line, column, '', chars} | t], buffer, scope, state)
-    # TODO: Make this an error on Elixir v2.0 since it accidentally worked previously.
-    # raise EEx.SyntaxError, message: message, file: state.file, line: line
+  defp generate_buffer([{ :end_expr, line, _, chars }|t], buffer, [current|_], state) do
+    { wrapped, state } = wrap_expr(current, line, buffer, chars, state)
+    tuples = maybe_block Erlang.elixir_translator.forms(wrapped, state.start_line, state.file)
+    buffer = insert_quotes(tuples, state.dict)
+    { buffer, t }
  end

-  defp generate_buffer([{:middle_expr, line, column, _, chars} | _], _buffer, [], state) do
-    raise EEx.SyntaxError,
-      message: "unexpected middle of expression <%#{chars}%>",
-      file: state.file,
-      line: line,
-      column: column
+  defp generate_buffer([{ :end_expr, line, _, chars }|_], _buffer, [], _state) do
+    raise EEx.SyntaxError, message: "unexpected token: #{inspect chars} at line #{inspect line}"
  end

-  defp generate_buffer(
-         [{:end_expr, line, _column, '', chars} | rest],
-         buffer,
-         [current | _],
-         state
-       ) do
-    {wrapped, state} = wrap_expr(current, line, buffer, chars, state)
-    column = state.start_column
-    options = [file: state.file, line: state.start_line, column: column] ++ state.parser_options
-    tuples = Code.string_to_quoted!(wrapped, options)
-    buffer = insert_quoted(tuples, state.quoted)
-    {buffer, rest}
+  defp generate_buffer([], buffer, [], _state) do
+    buffer
  end

-  defp generate_buffer(
-         [{:end_expr, line, column, modifier, chars} | t],
-         buffer,
-         [_ | _] = scope,
-         state
-       ) do
-    message =
-      "unexpected beginning of EEx tag \"<%#{modifier}\" on end of " <>
-        "expression \"<%#{modifier}#{chars}%>\", please remove \"#{modifier}\" accordingly"
-
-    :elixir_errors.erl_warn({line, column}, state.file, message)
-    generate_buffer([{:end_expr, line, column, '', chars} | t], buffer, scope, state)
-    # TODO: Make this an error on Elixir v2.0 since it accidentally worked previously.
-    # raise EEx.SyntaxError, message: message, file: state.file, line: line, column: column
-  end
-
-  defp generate_buffer([{:end_expr, line, column, _, chars} | _], _buffer, [], state) do
-    raise EEx.SyntaxError,
-      message: "unexpected end of expression <%#{chars}%>",
-      file: state.file,
-      line: line,
-      column: column
-  end
-
-  defp generate_buffer([{:eof, _, _}], buffer, [], state) do
-    state.engine.handle_body(buffer)
-  end
-
-  defp generate_buffer([{:eof, line, column}], _buffer, _scope, state) do
-    raise EEx.SyntaxError,
-      message: "unexpected end of string, expected a closing '<% end %>'",
-      file: state.file,
-      line: line,
-      column: column
+  defp generate_buffer([], _buffer, _scope, _state) do
+    raise EEx.SyntaxError, message: "unexpected end of string. expecting a closing <% end %>."
  end

  # Creates a placeholder and wrap it inside the expression block

  defp wrap_expr(current, line, buffer, chars, state) do
    new_lines = List.duplicate(?\n, line - state.line)
-    key = length(state.quoted)
-    placeholder = '__EEX__(' ++ Integer.to_charlist(key) ++ ');'
-    count = current ++ placeholder ++ new_lines ++ chars
-    new_state = %{state | quoted: [{key, state.engine.handle_end(buffer)} | state.quoted]}

-    {count, new_state}
-  end
-
-  # Look middle expressions that immediately follow a start_expr
-
-  defp look_ahead_middle([{:text, _, _, text} | rest], start, contents) do
-    if only_spaces?(text) do
-      look_ahead_middle(rest, start, contents ++ text)
+    if state.dict == [] and is_empty?(buffer) do
+      { current ++ new_lines ++ chars, state }
    else
-      nil
+      key = length(state.dict)
+      placeholder = '__EEX__(' ++ integer_to_list(key) ++ ');'
+      { current ++ placeholder ++ new_lines ++ chars, state.prepend_dict([{key, buffer}]) }
    end
  end

-  defp look_ahead_middle([{:middle_expr, line, _column, _, chars} | rest], _start, contents) do
-    {rest, line, contents ++ chars}
+  # Check if the syntax node represents an empty string
+
+  defp is_empty?(bin) when is_binary(bin) do
+    bc(<<c>> inbits bin, not c in [?\s,?\t,?\r,?\n], do: <<c>>) == ""
  end

-  defp look_ahead_middle(_tokens, _start, _contents) do
-    nil
+  defp is_empty?({ :<>, _, [left, right] }) do
+    is_empty?(left) and is_empty?(right)
  end

-  defp only_spaces?(chars) do
-    Enum.all?(chars, &(&1 in [?\s, ?\t, ?\r, ?\n]))
+  defp is_empty?(_) do
+    false
  end

+  # Block wrapping
+
+  defp maybe_block([]),    do: nil
+  defp maybe_block([h]),   do: h
+  defp maybe_block(other), do: { :__block__, 0, other }
+
  # Changes placeholder to real expression

-  defp insert_quoted({:__EEX__, _, [key]}, quoted) do
-    {^key, value} = List.keyfind(quoted, key, 0)
+  defp insert_quotes({ :__EEX__, _, [key] }, dict) do
+    { ^key, value } = List.keyfind dict, key, 1
    value
  end

-  defp insert_quoted({left, line, right}, quoted) do
-    {insert_quoted(left, quoted), line, insert_quoted(right, quoted)}
+  defp insert_quotes({ left, line, right }, dict) do
+    { insert_quotes(left, dict), line, insert_quotes(right, dict) }
  end

-  defp insert_quoted({left, right}, quoted) do
-    {insert_quoted(left, quoted), insert_quoted(right, quoted)}
+  defp insert_quotes({ left, right }, dict) do
+    { insert_quotes(left, dict), insert_quotes(right, dict) }
  end

-  defp insert_quoted(list, quoted) when is_list(list) do
-    Enum.map(list, &insert_quoted(&1, quoted))
+  defp insert_quotes(list, dict) when is_list(list) do
+    Enum.map list, insert_quotes(&1, dict)
  end

-  defp insert_quoted(other, _quoted) do
+  defp insert_quotes(other, _dict) do
    other
  end
-
-  defp column(column, mark) do
-    # length('<%') == 2
-    column + 2 + length(mark)
-  end
 end
@@ -1,221 +1,57 @@
 defmodule EEx.Engine do
-  @moduledoc ~S"""
-  Basic EEx engine that ships with Elixir.
+  @moduledoc %B"""
+  This is the basic EEx engine that ships with Elixir.
+  An engine needs to implement two functions:

-  An engine needs to implement all callbacks below.
+  * `handle_text(buffer, text)` - it receives the buffer,
+    the text and must return a new quoted expression;

-  This module also ships with a default engine implementation
-  you can delegate to. See `EEx.SmartEngine` as an example.
+  * `handle_expr(buffer, marker, expr)` - it receives the buffer,
+    the marker, the expr and must return a new quoted expression;
+
+    The marker is what follows exactly after `<%`. For example,
+    `<% foo %>` has an empty marker, but `<%= foo %>` has `'='`
+    as marker. The allowed markers so far are:
+
+    * `''`
+    * `'='`
+
+    Read `handle_expr/3` below for more information about the markers
+    implemented by default by this engine.
  """

-  @type state :: term
-
  @doc """
-  Called at the beginning of every template.
-
-  It must return the initial state.
+  The default implementation simply concatenates text to the buffer.
  """
-  @callback init(opts :: keyword) :: state
+  def handle_text(buffer, text) do
+    quote do: unquote(buffer) <> unquote(text)
+  end

  @doc """
-  Called at the end of every template.
+  Implements expressions according to the markers.

-  It must return Elixir's quoted expressions for the template.
+      <% Elixir expression - inline with output %>
+      <%= Elixir expression - replace with result %>
+
+  All other markers are not implemented by this engine.
  """
-  @callback handle_body(state) :: Macro.t()
-
-  @doc """
-  Called for the text/static parts of a template.
-
-  It must return the updated state.
-  """
-  @callback handle_text(state, [line: pos_integer, column: pos_integer], text :: String.t()) ::
-              state
-
-  @doc """
-  Called for the dynamic/code parts of a template.
-
-  The marker is what follows exactly after `<%`. For example,
-  `<% foo %>` has an empty marker, but `<%= foo %>` has `"="`
-  as marker. The allowed markers so far are:
-
-    * `""`
-    * `"="`
-    * `"/"`
-    * `"|"`
-
-  Markers `"/"` and `"|"` are only for use in custom EEx engines
-  and are not implemented by default. Using them without an
-  appropriate implementation raises `EEx.SyntaxError`.
-
-  It must return the updated state.
-  """
-  @callback handle_expr(state, marker :: String.t(), expr :: Macro.t()) :: state
-
-  @doc """
-  Invoked at the beginning of every nesting.
-
-  It must return a new state that is used only inside the nesting.
-  Once the nesting terminates, the current `state` is resumed.
-  """
-  @callback handle_begin(state) :: state
-
-  @doc """
-  Invokes at the end of a nesting.
-
-  It must return Elixir's quoted expressions for the nesting.
-  """
-  @callback handle_end(state) :: Macro.t()
-
-  @doc false
-  @deprecated "Use explicit delegation to EEx.Engine instead"
-  defmacro __using__(_) do
+  def handle_expr(buffer, '=', expr) do
    quote do
-      @behaviour EEx.Engine
-
-      def init(opts) do
-        EEx.Engine.init(opts)
-      end
-
-      def handle_body(state) do
-        EEx.Engine.handle_body(state)
-      end
-
-      def handle_begin(state) do
-        EEx.Engine.handle_begin(state)
-      end
-
-      def handle_end(state) do
-        EEx.Engine.handle_end(state)
-      end
-
-      def handle_text(state, text) do
-        EEx.Engine.handle_text(state, [], text)
-      end
-
-      def handle_expr(state, marker, expr) do
-        EEx.Engine.handle_expr(state, marker, expr)
-      end
-
-      defoverridable EEx.Engine
+      tmp_1 = unquote(buffer)
+      tmp_2 = to_binary(unquote(expr))
+      tmp_1 <> tmp_2
    end
  end

-  @doc """
-  Handles assigns in quoted expressions.
-
-  A warning will be printed on missing assigns.
-  Future versions will raise.
-
-  This can be added to any custom engine by invoking
-  `handle_assign/1` with `Macro.prewalk/2`:
-
-      def handle_expr(state, token, expr) do
-        expr = Macro.prewalk(expr, &EEx.Engine.handle_assign/1)
-        super(state, token, expr)
-      end
-
-  """
-  @spec handle_assign(Macro.t()) :: Macro.t()
-  def handle_assign({:@, meta, [{name, _, atom}]}) when is_atom(name) and is_atom(atom) do
-    line = meta[:line] || 0
-    quote(line: line, do: EEx.Engine.fetch_assign!(var!(assigns), unquote(name)))
-  end
-
-  def handle_assign(arg) do
-    arg
-  end
-
-  @doc false
-  # TODO: Raise on v2.0
-  @spec fetch_assign!(Access.t(), Access.key()) :: term | nil
-  def fetch_assign!(assigns, key) do
-    case Access.fetch(assigns, key) do
-      {:ok, val} ->
-        val
-
-      :error ->
-        keys = Enum.map(assigns, &elem(&1, 0))
-
-        IO.warn(
-          "assign @#{key} not available in EEx template. " <>
-            "Please ensure all assigns are given as options. " <>
-            "Available assigns: #{inspect(keys)}"
-        )
-
-        nil
+  def handle_expr(buffer, '', expr) do
+    quote do
+      tmp = unquote(buffer)
+      unquote(expr)
+      tmp
    end
  end

-  @doc "Default implementation for `c:init/1`."
-  def init(_opts) do
-    %{
-      binary: [],
-      dynamic: [],
-      vars_count: 0
-    }
+  def behaviour_info(:callbacks) do
+    [handle_text: 2, handle_expr: 3]
  end
-
-  @doc "Default implementation for `c:handle_begin/1`."
-  def handle_begin(state) do
-    check_state!(state)
-    %{state | binary: [], dynamic: []}
-  end
-
-  @doc "Default implementation for `c:handle_end/1`."
-  def handle_end(quoted) do
-    handle_body(quoted)
-  end
-
-  @doc "Default implementation for `c:handle_body/1`."
-  def handle_body(state) do
-    check_state!(state)
-    %{binary: binary, dynamic: dynamic} = state
-    binary = {:<<>>, [], Enum.reverse(binary)}
-    dynamic = [binary | dynamic]
-    {:__block__, [], Enum.reverse(dynamic)}
-  end
-
-  @doc "Default implementation for `c:handle_text/3`."
-  def handle_text(state, _meta, text) do
-    check_state!(state)
-    %{binary: binary} = state
-    %{state | binary: [text | binary]}
-  end
-
-  @doc "Default implementation for `c:handle_expr/3`."
-  def handle_expr(state, "=", ast) do
-    check_state!(state)
-    %{binary: binary, dynamic: dynamic, vars_count: vars_count} = state
-    var = Macro.var(:"arg#{vars_count}", __MODULE__)
-
-    ast =
-      quote do
-        unquote(var) = String.Chars.to_string(unquote(ast))
-      end
-
-    segment =
-      quote do
-        unquote(var) :: binary
-      end
-
-    %{state | dynamic: [ast | dynamic], binary: [segment | binary], vars_count: vars_count + 1}
-  end
-
-  def handle_expr(state, "", ast) do
-    %{dynamic: dynamic} = state
-    %{state | dynamic: [ast | dynamic]}
-  end
-
-  def handle_expr(_state, marker, _ast) when marker in ["/", "|"] do
-    raise EEx.SyntaxError,
-          "unsupported EEx syntax <%#{marker} %> (the syntax is valid but not supported by the current EEx engine)"
-  end
-
-  defp check_state!(%{binary: _, dynamic: _, vars_count: _}), do: :ok
-
-  defp check_state!(state) do
-    raise "unexpected EEx.Engine state: #{inspect(state)}. " <>
-            "This typically means a bug or an outdated EEx.Engine or tool"
-  end
-end
+end
@@ -1,58 +1,97 @@
-defmodule EEx.SmartEngine do
+defmodule EEx.TransformerEngine do
  @moduledoc """
-  The default engine used by EEx.
+  An abstract engine that is meant to be used and
+  built upon in other modules. This engine implements
+  the `EEx.Engine` behavior and provides a `transform`
+  overridable directive that allows a developer to
+  customize the expression returned by the engine.

-  It includes assigns (like `@foo`) and possibly other
-  conveniences in the future.
+  Check `EEx.AssignsEngine` and `EEx.SmartEngine` for
+  examples of using this module.
+  """
+
+  @doc false
+  defmacro __using__(_) do
+    quote do
+      @behavior EEx.Engine
+
+      def handle_text(buffer, text) do
+        EEx.Engine.handle_text(buffer, text)
+      end
+
+      def handle_expr(buffer, mark, expr) do
+        EEx.Engine.handle_expr(buffer, mark, transform(expr))
+      end
+
+      defp transform({ a, b, c }) do
+        { transform(a), b, transform(c) }
+      end
+
+      defp transform({ a, b }) do
+        { transform(a), transform(b) }
+      end
+
+      defp transform(list) when is_list(list) do
+        lc i inlist list, do: transform(i)
+      end
+
+      defp transform(other) do
+        other
+      end
+
+      defoverridable [transform: 1, handle_expr: 3, handle_text: 2]
+    end
+  end
+end
+
+defmodule EEx.AssignsEngine do
+  @moduledoc """
+  An abstract engine that, when used with the
+  `TransformerEngine`, allows a developer to access
+  assigns using `@` as syntax.
+
+  This engine is included by default on the SmartEngine.

  ## Examples

-      iex> EEx.eval_string("<%= @foo %>", assigns: [foo: 1])
-      "1"
-
-  In the example above, we can access the value `foo` under
-  the binding `assigns` using `@foo`. This is useful because
-  a template, after being compiled, can receive different
-  assigns and would not require recompilation for each
-  variable set.
-
-  Assigns can also be used when compiled to a function:
-
-      # sample.eex
-      <%= @a + @b %>
-
-      # sample.ex
-      defmodule Sample do
-        require EEx
-        EEx.function_from_file(:def, :sample, "sample.eex", [:assigns])
+      defmodule MyEngine do
+        use EEx.TransformerEngine
+        use EEx.AssignsEngine
      end

-      # iex
-      Sample.sample(a: 1, b: 2)
-      #=> "3"
+      EEx.eval_string("<%= @foo %>", assigns: [foo: 1])
+      #=> 1

+  In the example above, we can access the value `foo` under
+  the binding `assigns` using `@foo`. This is useful when
+  a template, after compiled, may receive different assigns
+  and the developer don't want to recompile it for each
+  variable set.
  """

-  @behaviour EEx.Engine
+  @doc false
+  defmacro __using__(_) do
+    quote unquote: false do
+      defp transform({ :@, line, [{ name, _, atom }] }) when is_atom(name) and is_atom(atom) do
+        quote(do: Keyword.get var!(assigns), unquote(name))
+      end

-  @impl true
-  defdelegate init(opts), to: EEx.Engine
+      defp transform(_) do
+        super
+      end

-  @impl true
-  defdelegate handle_body(state), to: EEx.Engine
-
-  @impl true
-  defdelegate handle_begin(state), to: EEx.Engine
-
-  @impl true
-  defdelegate handle_end(state), to: EEx.Engine
-
-  @impl true
-  defdelegate handle_text(state, meta, text), to: EEx.Engine
-
-  @impl true
-  def handle_expr(state, marker, expr) do
-    expr = Macro.prewalk(expr, &EEx.Engine.handle_assign/1)
-    EEx.Engine.handle_expr(state, marker, expr)
+      defoverridable [transform: 1]
+    end
  end
 end
+
+defmodule EEx.SmartEngine do
+  use EEx.TransformerEngine
+  use EEx.AssignsEngine
+
+  @moduledoc """
+  An engine meant for end-user usage that includes
+  `AssignsEngine` and other conveniences. Read
+  `EEx.AssignsEngine` for examples.
+  """
+end
@@ -1,244 +1,151 @@
 defmodule EEx.Tokenizer do
  @moduledoc false

-  @type content :: IO.chardata()
-  @type line :: non_neg_integer
-  @type column :: non_neg_integer
-  @type marker :: '=' | '/' | '|' | ''
-  @type token ::
-          {:text, line, column, content}
-          | {:expr | :start_expr | :middle_expr | :end_expr, line, column, marker, content}
-          | {:eof, line, column}
-
-  @spaces [?\s, ?\t]
-
  @doc """
-  Tokenizes the given charlist or binary.
+  Tokenizes the given char list or binary.
+  It returns 4 different types of tokens as result:

-  It returns {:ok, list} with the following tokens:
+  * { :text, line, contents }
+  * { :expr, line, marker, contents }
+  * { :start_expr, line, marker, contents }
+  * { :end_expr, line, marker, contents }

-    * `{:text, line, column, content}`
-    * `{:expr, line, column, marker, content}`
-    * `{:start_expr, line, column, marker, content}`
-    * `{:middle_expr, line, column, marker, content}`
-    * `{:end_expr, line, column, marker, content}`
-    * `{:eof, line, column}`
-
-  Or `{:error, line, column, message}` in case of errors.
  """
-  @spec tokenize(binary | charlist, line, column, map) ::
-          {:ok, [token]} | {:error, line, column, String.t()}
-
-  def tokenize(bin, line, column, opts) when is_binary(bin) do
-    tokenize(String.to_charlist(bin), line, column, opts)
+  def tokenize(bin, line) when is_binary(bin) do
+    tokenize(binary_to_list(bin), line)
  end

-  def tokenize(list, line, column, opts)
-      when is_list(list) and is_integer(line) and line >= 0 and is_integer(column) and column >= 0 do
-    column = opts.indentation + column
-
-    {list, line, column} =
-      (opts.trim && trim_init(list, line, column, opts)) || {list, line, column}
-
-    tokenize(list, line, column, opts, [{line, column}], [])
+  def tokenize(list, line) do
+    List.reverse(tokenize(list, line, line, [], []))
  end

-  defp tokenize('<%%' ++ t, line, column, opts, buffer, acc) do
-    tokenize(t, line, column + 3, opts, [?%, ?< | buffer], acc)
+  defp tokenize([?<,?%|t], current_line, line, buffer, acc) do
+    { marker, t } = retrieve_marker(t)
+    { expr, new_line, rest } = tokenize_expr t, line, []
+
+    token = token_name(expr)
+    acc   = tokenize_text(current_line, buffer, acc)
+    final = { token, line, marker, List.reverse(expr) }
+    tokenize rest, new_line, new_line, [], [final | acc]
  end

-  defp tokenize('<%#' ++ t, line, column, opts, buffer, acc) do
-    case expr(t, line, column + 3, opts, []) do
-      {:error, _, _, _} = error ->
-        error
-
-      {:ok, _, new_line, new_column, rest} ->
-        {rest, new_line, new_column, buffer} =
-          trim_if_needed(rest, new_line, new_column, opts, buffer)
-
-        acc = tokenize_text(buffer, acc)
-        tokenize(rest, new_line, new_column, opts, [{new_line, new_column}], acc)
-    end
+  defp tokenize('\n' ++ t, current_line, line, buffer, acc) do
+    tokenize t, current_line, line + 1, [?\n|buffer], acc
  end

-  defp tokenize('<%' ++ t, line, column, opts, buffer, acc) do
-    {marker, t} = retrieve_marker(t)
-
-    case expr(t, line, column + 2 + length(marker), opts, []) do
-      {:error, _, _, _} = error ->
-        error
-
-      {:ok, expr, new_line, new_column, rest} ->
-        {key, expr} =
-          case :elixir_tokenizer.tokenize(expr, 1, file: "eex", check_terminators: false) do
-            {:ok, _line, _column, warnings, tokens} ->
-              Enum.each(Enum.reverse(warnings), fn {location, file, msg} ->
-                :elixir_errors.erl_warn(location, file, msg)
-              end)
-
-              token_key(tokens, expr)
-
-            {:error, _, _, _, _} ->
-              {:expr, expr}
-          end
-
-        {rest, new_line, new_column, buffer} =
-          trim_if_needed(rest, new_line, new_column, opts, buffer)
-
-        acc = tokenize_text(buffer, acc)
-        final = {key, line, column, marker, expr}
-        tokenize(rest, new_line, new_column, opts, [{new_line, new_column}], [final | acc])
-    end
+  defp tokenize([h|t], current_line, line, buffer, acc) do
+    tokenize t, current_line, line, [h|buffer], acc
  end

-  defp tokenize('\n' ++ t, line, _column, opts, buffer, acc) do
-    tokenize(t, line + 1, opts.indentation + 1, opts, [?\n | buffer], acc)
-  end
-
-  defp tokenize([h | t], line, column, opts, buffer, acc) do
-    tokenize(t, line, column + 1, opts, [h | buffer], acc)
-  end
-
-  defp tokenize([], line, column, _opts, buffer, acc) do
-    eof = {:eof, line, column}
-    {:ok, Enum.reverse([eof | tokenize_text(buffer, acc)])}
+  defp tokenize([], current_line, _line, buffer, acc) do
+    tokenize_text(current_line, buffer, acc)
  end

  # Retrieve marker for <%

-  defp retrieve_marker([marker | t]) when marker in [?=, ?/, ?|] do
-    {[marker], t}
+  defp retrieve_marker('=' ++ t) do
+    { '=', t }
  end

  defp retrieve_marker(t) do
-    {'', t}
+    { '', t }
  end

  # Tokenize an expression until we find %>

-  defp expr([?%, ?> | t], line, column, _opts, buffer) do
-    {:ok, Enum.reverse(buffer), line, column + 2, t}
+  defp tokenize_expr([?%,?>|t], line, buffer) do
+    { buffer, line, t }
  end

-  defp expr('\n' ++ t, line, _column, opts, buffer) do
-    expr(t, line + 1, opts.indentation + 1, opts, [?\n | buffer])
+  defp tokenize_expr('\n' ++ t, line, buffer) do
+    tokenize_expr t, line + 1, [?\n|buffer]
  end

-  defp expr([h | t], line, column, opts, buffer) do
-    expr(t, line, column + 1, opts, [h | buffer])
+  defp tokenize_expr([h|t], line, buffer) do
+    tokenize_expr t, line, [h|buffer]
  end

-  defp expr([], line, column, _opts, _buffer) do
-    {:error, line, column, "missing token '%>'"}
+  # Raise an error if the expected token is not found
+
+  defp tokenize_expr([], _line, _buffer) do
+    raise EEx.SyntaxError, message: "missing token: %>"
  end

-  # Receives tokens and check if it is a start, middle or an end token.
-  defp token_key(tokens, expr) do
-    case {tokens, tokens |> Enum.reverse() |> drop_eol()} do
-      {[{:end, _} | _], [{:do, _} | _]} ->
-        {:middle_expr, expr}
+  # Receive an expression content and check
+  # if it is a start, middle or an end token.
+  #
+  # Start tokens finish with `do` and `fn ->`
+  # Middle tokens are marked with `->` or keywords
+  # End tokens contain only the end word

-      {_, [{:do, _} | _]} ->
-        {:start_expr, maybe_append_space(expr)}
+  defp token_name([h|t]) when h in [?\s, ?\t] do
+    token_name(t)
+  end

-      {_, [{:block_identifier, _, _} | _]} ->
-        {:middle_expr, maybe_append_space(expr)}
+  defp token_name('od' ++ [h|_]) when h in [?\s, ?\t, ?)] do
+    :start_expr
+  end

-      {[{:end, _} | _], [{:stab_op, _, _} | _]} ->
-        {:middle_expr, expr}
+  defp token_name('>-' ++ rest) do
+    rest = List.reverse(rest)

-      {_, [{:stab_op, _, _} | reverse_tokens]} ->
-        fn_index = Enum.find_index(reverse_tokens, &match?({:fn, _}, &1)) || :infinity
-        end_index = Enum.find_index(reverse_tokens, &match?({:end, _}, &1)) || :infinity
+    # Tokenize the remaining passing "__internal__" as file,
+    # which relax the tokenizer to not error on unmatched
+    # pairs. Then, we check if there is a "fn" token and,
+    # if so, it is not followed by an "end" token. If this
+    # is the case, we are on a start expr.
+    case :elixir_tokenizer.tokenize(rest, 1, "__internal__") do
+      { :ok, tokens } ->
+        tokens   = List.reverse(tokens)
+        fn_index = fn_index(tokens)

-        if end_index > fn_index do
-          {:start_expr, expr}
+        if fn_index && end_index(tokens) > fn_index do
+          :start_expr
        else
-          {:middle_expr, expr}
-        end
-
-      {tokens, _} ->
-        case Enum.drop_while(tokens, &closing_bracket?/1) do
-          [{:end, _} | _] -> {:end_expr, expr}
-          _ -> {:expr, expr}
+          :middle_expr
        end
+      error ->
+        :middle_expr
    end
  end

-  defp drop_eol([{:eol, _} | rest]), do: drop_eol(rest)
-  defp drop_eol(rest), do: rest
+  defp token_name('esle' ++ t),   do: check_spaces(t, :middle_expr)
+  defp token_name('retfa' ++ t),  do: check_spaces(t, :middle_expr)
+  defp token_name('hctac' ++ t),  do: check_spaces(t, :middle_expr)
+  defp token_name('eucser' ++ t), do: check_spaces(t, :middle_expr)
+  defp token_name('dne' ++ t),    do: check_spaces(t, :end_expr)

-  defp maybe_append_space([?\s]), do: [?\s]
-  defp maybe_append_space([h]), do: [h, ?\s]
-  defp maybe_append_space([h | t]), do: [h | maybe_append_space(t)]
+  defp token_name(_) do
+    :expr
+  end

-  defp closing_bracket?({closing, _}) when closing in ~w"( [ {"a, do: true
-  defp closing_bracket?(_), do: false
+  defp fn_index(tokens) do
+    Enum.find_index(tokens, function do
+      { :fn_paren, _ } -> true
+      { :fn, _ }       -> true
+      _                -> false
+    end)
+  end
+
+  defp end_index(tokens) do
+    Enum.find_index(tokens, match?({ :end, _ }, &1)) || :infinity
+  end
+
+  defp check_spaces(string, token) do
+    if only_spaces?(string), do: token, else: :expr
+  end
+
+  defp only_spaces?([h|t]) when h in [?\s, ?\t], do: only_spaces?(t)
+  defp only_spaces?(other), do: other == []

  # Tokenize the buffered text by appending
  # it to the given accumulator.

-  defp tokenize_text([{_line, _column}], acc) do
+  defp tokenize_text(_line, [], acc) do
    acc
  end

-  defp tokenize_text(buffer, acc) do
-    [{line, column} | buffer] = Enum.reverse(buffer)
-    [{:text, line, column, buffer} | acc]
+  defp tokenize_text(line, buffer, acc) do
+    [{ :text, line, list_to_binary(List.reverse(buffer)) } | acc]
  end
-
-  defp trim_if_needed(rest, line, column, opts, buffer) do
-    if opts.trim do
-      buffer = trim_left(buffer, 0)
-      {rest, line, column} = trim_right(rest, line, column, 0, opts)
-      {rest, line, column, buffer}
-    else
-      {rest, line, column, buffer}
-    end
-  end
-
-  defp trim_init([h | t], line, column, opts) when h in @spaces,
-    do: trim_init(t, line, column + 1, opts)
-
-  defp trim_init([?\r, ?\n | t], line, _column, opts),
-    do: trim_init(t, line + 1, opts.indentation + 1, opts)
-
-  defp trim_init([?\n | t], line, _column, opts),
-    do: trim_init(t, line + 1, opts.indentation + 1, opts)
-
-  defp trim_init([?<, ?% | _] = rest, line, column, _opts),
-    do: {rest, line, column}
-
-  defp trim_init(_, _, _, _), do: false
-
-  defp trim_left(buffer, count) do
-    case trim_whitespace(buffer, 0) do
-      {[?\n, ?\r | rest], _} -> trim_left(rest, count + 1)
-      {[?\n | rest], _} -> trim_left(rest, count + 1)
-      _ when count > 0 -> [?\n | buffer]
-      _ -> buffer
-    end
-  end
-
-  defp trim_right(rest, line, column, last_column, opts) do
-    case trim_whitespace(rest, column) do
-      {[?\r, ?\n | rest], column} ->
-        trim_right(rest, line + 1, opts.indentation + 1, column + 1, opts)
-
-      {[?\n | rest], column} ->
-        trim_right(rest, line + 1, opts.indentation + 1, column, opts)
-
-      {[], column} ->
-        {[], line, column}
-
-      _ when last_column > 0 ->
-        {[?\n | rest], line - 1, last_column}
-
-      _ ->
-        {rest, line, column}
-    end
-  end
-
-  defp trim_whitespace([h | t], column) when h in @spaces, do: trim_whitespace(t, column + 1)
-  defp trim_whitespace(list, column), do: {list, column}
 end
@@ -1,11 +1,7 @@
-defmodule EEx.MixProject do
+defmodule EEx.Mixfile do
  use Mix.Project

  def project do
-    [
-      app: :eex,
-      version: System.version(),
-      build_per_environment: false
-    ]
+    [app: :eex, version: System.version]
  end
-end
+end
@@ -1,59 +1,22 @@
-Code.require_file("../test_helper.exs", __DIR__)
+Code.require_file "../../test_helper", __FILE__

 defmodule EEx.SmartEngineTest do
  use ExUnit.Case, async: true

  test "evaluates simple string" do
-    assert_eval("foo bar", "foo bar")
+    assert_eval "foo bar", "foo bar"
  end

-  test "evaluates with assigns as keywords" do
-    assert_eval("1", "<%= @foo %>", assigns: [foo: 1])
-  end
-
-  test "evaluates with assigns as a map" do
-    assert_eval("1", "<%= @foo %>", assigns: %{foo: 1})
-  end
-
-  test "error with missing assigns" do
-    stderr =
-      ExUnit.CaptureIO.capture_io(:stderr, fn ->
-        assert_eval("", "<%= @foo %>", assigns: %{})
-      end)
-
-    assert stderr =~ "assign @foo not available in EEx template"
+  test "evaluates with assigns" do
+    assert_eval "1", "<%= @foo %>", assigns: [foo: 1]
  end

  test "evaluates with loops" do
-    assert_eval("1\n2\n3\n", "<%= for x <- [1, 2, 3] do %><%= x %>\n<% end %>")
+    assert_eval "1\n2\n3\n", "<%= lc x inlist [1,2,3] do %><%= x %>\n<% end %>"
  end

-  test "preserves line numbers in assignments" do
-    result = EEx.compile_string("foo\n<%= @hello %>", engine: EEx.SmartEngine)
-
-    Macro.prewalk(result, fn
-      {_left, meta, [_, :hello]} ->
-        assert Keyword.get(meta, :line) == 2
-        send(self(), :found)
-
-      node ->
-        node
-    end)
-
-    assert_received :found
-  end
-
-  test "error with unused \"do\" block without \"<%=\" modifier" do
-    stderr =
-      ExUnit.CaptureIO.capture_io(:stderr, fn ->
-        assert_eval("", "<% if true do %>I'm invisible!<% end %>", assigns: %{})
-      end)
-
-    assert stderr =~ "the contents of this expression won't be output"
-  end
-
-  defp assert_eval(expected, actual, binding \\ []) do
-    result = EEx.eval_string(actual, binding, file: __ENV__.file, engine: EEx.SmartEngine)
+  defp assert_eval(expected, actual, binding // []) do
+    result = EEx.eval_string(actual, binding, file: __FILE__)
    assert result == expected
  end
 end
@@ -1,305 +1,81 @@
-Code.require_file("../test_helper.exs", __DIR__)
+Code.require_file "../../test_helper", __FILE__

 defmodule EEx.TokenizerTest do
  use ExUnit.Case, async: true
  require EEx.Tokenizer, as: T

-  @opts %{indentation: 0, trim: false}
-
  test "simple chars lists" do
-    assert T.tokenize('foo', 1, 1, @opts) == {:ok, [{:text, 1, 1, 'foo'}, {:eof, 1, 4}]}
+    assert T.tokenize('foo', 1) == [ { :text, 1, "foo" } ]
  end

  test "simple strings" do
-    assert T.tokenize("foo", 1, 1, @opts) == {:ok, [{:text, 1, 1, 'foo'}, {:eof, 1, 4}]}
+    assert T.tokenize("foo", 1) == [ { :text, 1, "foo" } ]
  end

  test "strings with embedded code" do
-    assert T.tokenize('foo <% bar %>', 1, 1, @opts) ==
-             {:ok, [{:text, 1, 1, 'foo '}, {:expr, 1, 5, '', ' bar '}, {:eof, 1, 14}]}
+    assert T.tokenize('foo <% bar %>', 1) == [ { :text, 1, "foo " }, { :expr, 1, [], ' bar ' } ]
  end

  test "strings with embedded equals code" do
-    assert T.tokenize('foo <%= bar %>', 1, 1, @opts) ==
-             {:ok, [{:text, 1, 1, 'foo '}, {:expr, 1, 5, '=', ' bar '}, {:eof, 1, 15}]}
-  end
-
-  test "strings with embedded slash code" do
-    assert T.tokenize('foo <%/ bar %>', 1, 1, @opts) ==
-             {:ok, [{:text, 1, 1, 'foo '}, {:expr, 1, 5, '/', ' bar '}, {:eof, 1, 15}]}
-  end
-
-  test "strings with embedded pipe code" do
-    assert T.tokenize('foo <%| bar %>', 1, 1, @opts) ==
-             {:ok, [{:text, 1, 1, 'foo '}, {:expr, 1, 5, '|', ' bar '}, {:eof, 1, 15}]}
+    assert T.tokenize('foo <%= bar %>', 1) == [ { :text, 1, "foo " }, { :expr, 1, '=', ' bar ' } ]
  end

  test "strings with more than one line" do
-    assert T.tokenize('foo\n<%= bar %>', 1, 1, @opts) ==
-             {:ok, [{:text, 1, 1, 'foo\n'}, {:expr, 2, 1, '=', ' bar '}, {:eof, 2, 11}]}
+    assert T.tokenize('foo\n<%= bar %>', 1) == [ { :text, 1, "foo\n" },{ :expr, 2, '=', ' bar ' } ]
  end

  test "strings with more than one line and expression with more than one line" do
    string = '''
-    foo <%= bar
+foo <%= bar

-    baz %>
-    <% foo %>
-    '''
+baz %>
+<% foo %>
+'''

-    exprs = [
-      {:text, 1, 1, 'foo '},
-      {:expr, 1, 5, '=', ' bar\n\nbaz '},
-      {:text, 3, 7, '\n'},
-      {:expr, 4, 1, '', ' foo '},
-      {:text, 4, 10, '\n'},
-      {:eof, 5, 1}
-    ]
-
-    assert T.tokenize(string, 1, 1, @opts) == {:ok, exprs}
-  end
-
-  test "quotation" do
-    assert T.tokenize('foo <%% true %>', 1, 1, @opts) ==
-             {:ok, [{:text, 1, 1, 'foo <% true %>'}, {:eof, 1, 16}]}
-  end
-
-  test "quotation with do-end" do
-    assert T.tokenize('foo <%% true do %>bar<%% end %>', 1, 1, @opts) ==
-             {:ok, [{:text, 1, 1, 'foo <% true do %>bar<% end %>'}, {:eof, 1, 32}]}
-  end
-
-  test "quotation with interpolation" do
-    exprs = [
-      {:text, 1, 1, 'a <% b '},
-      {:expr, 1, 9, '=', ' c '},
-      {:text, 1, 17, ' '},
-      {:expr, 1, 18, '=', ' d '},
-      {:text, 1, 26, ' e %> f'},
-      {:eof, 1, 33}
-    ]
-
-    assert T.tokenize('a <%% b <%= c %> <%= d %> e %> f', 1, 1, @opts) == {:ok, exprs}
-  end
-
-  test "improperly formatted quotation with interpolation" do
-    exprs = [
-      {:text, 1, 1, '<%% a <%= b %> c %>'},
-      {:eof, 1, 22}
-    ]
-
-    assert T.tokenize('<%%% a <%%= b %> c %>', 1, 1, @opts) == {:ok, exprs}
-  end
-
-  test "EEx comments" do
-    exprs = [
-      {:text, 1, 1, 'foo '},
-      {:eof, 1, 16}
-    ]
-
-    assert T.tokenize('foo <%# true %>', 1, 1, @opts) == {:ok, exprs}
-  end
-
-  test "EEx comments with do-end" do
-    exprs = [
-      {:text, 1, 1, 'foo '},
-      {:text, 1, 19, 'bar'},
-      {:eof, 1, 32}
-    ]
-
-    assert T.tokenize('foo <%# true do %>bar<%# end %>', 1, 1, @opts) == {:ok, exprs}
-  end
-
-  test "EEx comments inside do-end" do
-    exprs = [
-      {:start_expr, 1, 1, '', ' if true do '},
-      {:text, 1, 31, 'bar'},
-      {:end_expr, 1, 34, [], ' end '},
-      {:eof, 1, 43}
-    ]
-
-    assert T.tokenize('<% if true do %><%# comment %>bar<% end %>', 1, 1, @opts) == {:ok, exprs}
-
-    exprs = [
-      {:start_expr, 1, 1, [], ' case true do '},
-      {:middle_expr, 1, 33, '', ' true -> '},
-      {:text, 1, 46, 'bar'},
-      {:end_expr, 1, 49, [], ' end '},
-      {:eof, 1, 58}
-    ]
-
-    assert T.tokenize('<% case true do %><%# comment %><% true -> %>bar<% end %>', 1, 1, @opts) ==
-             {:ok, exprs}
-  end
-
-  test "Elixir comments" do
-    exprs = [
-      {:text, 1, 1, 'foo '},
-      {:expr, 1, 5, [], ' true # this is a boolean '},
-      {:eof, 1, 35}
-    ]
-
-    assert T.tokenize('foo <% true # this is a boolean %>', 1, 1, @opts) == {:ok, exprs}
-  end
-
-  test "Elixir comments with do-end" do
-    exprs = [
-      {:start_expr, 1, 1, [], ' if true do # startif '},
-      {:text, 1, 27, 'text'},
-      {:end_expr, 1, 31, [], ' end # closeif '},
-      {:eof, 1, 50}
-    ]
-
-    assert T.tokenize('<% if true do # startif %>text<% end # closeif %>', 1, 1, @opts) ==
-             {:ok, exprs}
+    assert T.tokenize(string, 1) == [
+      {:text, 1, "foo "},
+      {:expr, 1, '=', ' bar\n\nbaz '},
+      {:text, 3, "\n"},
+      {:expr, 4, [], ' foo '},
+      {:text, 4, "\n"}
+    ] 
  end

  test "strings with embedded do end" do
-    exprs = [
-      {:text, 1, 1, 'foo '},
-      {:start_expr, 1, 5, '', ' if true do '},
-      {:text, 1, 21, 'bar'},
-      {:end_expr, 1, 24, '', ' end '},
-      {:eof, 1, 33}
+    assert T.tokenize('foo <% if true do %>bar<% end %>', 1) == [
+      { :text, 1, "foo " },
+      { :start_expr, 1, '', ' if true do ' },
+      { :text, 1, "bar" },
+      { :end_expr, 1, '', ' end ' }
    ]
-
-    assert T.tokenize('foo <% if true do %>bar<% end %>', 1, 1, @opts) == {:ok, exprs}
  end

  test "strings with embedded -> end" do
-    exprs = [
-      {:text, 1, 1, 'foo '},
-      {:start_expr, 1, 5, '', ' cond do '},
-      {:middle_expr, 1, 18, '', ' false -> '},
-      {:text, 1, 32, 'bar'},
-      {:middle_expr, 1, 35, '', ' true -> '},
-      {:text, 1, 48, 'baz'},
-      {:end_expr, 1, 51, '', ' end '},
-      {:eof, 1, 60}
+    assert T.tokenize('foo <% cond do %><% false -> %>bar<% true -> %>baz<% end %>', 1) == [
+      { :text, 1, "foo " },
+      { :start_expr, 1, '', ' cond do ' },
+      { :middle_expr, 1, '', ' false -> ' },
+      { :text, 1, "bar" },
+      { :middle_expr, 1, '', ' true -> ' },
+      { :text, 1, "baz" },
+      { :end_expr, 1, '', ' end ' }
    ]
-
-    assert T.tokenize('foo <% cond do %><% false -> %>bar<% true -> %>baz<% end %>', 1, 1, @opts) ==
-             {:ok, exprs}
-  end
-
-  test "strings with fn-end with newline" do
-    exprs = [
-      {:start_expr, 1, 1, '=', ' a fn ->\n'},
-      {:text, 2, 3, 'foo'},
-      {:end_expr, 2, 6, [], ' end '},
-      {:eof, 2, 15}
-    ]
-
-    assert T.tokenize('<%= a fn ->\n%>foo<% end %>', 1, 1, @opts) ==
-             {:ok, exprs}
-  end
-
-  test "strings with multiple fn-end" do
-    exprs = [
-      {:start_expr, 1, 1, '=', ' a fn -> '},
-      {:text, 1, 15, 'foo'},
-      {:middle_expr, 1, 18, '', ' end, fn -> '},
-      {:text, 1, 34, 'bar'},
-      {:end_expr, 1, 37, '', ' end '},
-      {:eof, 1, 46}
-    ]
-
-    assert T.tokenize('<%= a fn -> %>foo<% end, fn -> %>bar<% end %>', 1, 1, @opts) ==
-             {:ok, exprs}
-  end
-
-  test "strings with fn-end followed by do block" do
-    exprs = [
-      {:start_expr, 1, 1, '=', ' a fn -> '},
-      {:text, 1, 15, 'foo'},
-      {:middle_expr, 1, 18, '', ' end do '},
-      {:text, 1, 30, 'bar'},
-      {:end_expr, 1, 33, '', ' end '},
-      {:eof, 1, 42}
-    ]
-
-    assert T.tokenize('<%= a fn -> %>foo<% end do %>bar<% end %>', 1, 1, @opts) == {:ok, exprs}
  end

  test "strings with embedded keywords blocks" do
-    exprs = [
-      {:text, 1, 1, 'foo '},
-      {:start_expr, 1, 5, '', ' if true do '},
-      {:text, 1, 21, 'bar'},
-      {:middle_expr, 1, 24, '', ' else '},
-      {:text, 1, 34, 'baz'},
-      {:end_expr, 1, 37, '', ' end '},
-      {:eof, 1, 46}
+    assert T.tokenize('foo <% if true do %>bar<% else %>baz<% end %>', 1) == [
+      { :text, 1, "foo " },
+      { :start_expr, 1, '', ' if true do ' },
+      { :text, 1, "bar" },
+      { :middle_expr, 1, '', ' else ' },
+      { :text, 1, "baz" },
+      { :end_expr, 1, '', ' end ' }
    ]
-
-    assert T.tokenize('foo <% if true do %>bar<% else %>baz<% end %>', 1, 1, @opts) ==
-             {:ok, exprs}
  end

-  test "trim mode" do
-    template = '\t<%= if true do %> \n TRUE \n  <% else %>\n FALSE \n  <% end %>  \n\n  '
-
-    exprs = [
-      {:start_expr, 1, 2, '=', ' if true do '},
-      {:text, 1, 20, '\n TRUE \n'},
-      {:middle_expr, 3, 3, '', ' else '},
-      {:text, 3, 13, '\n FALSE \n'},
-      {:end_expr, 5, 3, '', ' end '},
-      {:eof, 7, 3}
-    ]
-
-    assert T.tokenize(template, 1, 1, %{@opts | trim: true}) == {:ok, exprs}
-  end
-
-  test "trim mode with comment" do
-    exprs = [
-      {:text, 1, 19, '\n123'},
-      {:eof, 2, 4}
-    ]
-
-    assert T.tokenize('  <%# comment %>  \n123', 1, 1, %{@opts | trim: true}) == {:ok, exprs}
-  end
-
-  test "trim mode with CRLF" do
-    exprs = [
-      {:text, 1, 1, '0\n'},
-      {:expr, 2, 3, '=', ' 12 '},
-      {:text, 2, 15, '\n34'},
-      {:eof, 3, 3}
-    ]
-
-    assert T.tokenize('0\r\n  <%= 12 %>  \r\n34', 1, 1, %{@opts | trim: true}) == {:ok, exprs}
-  end
-
-  test "trim mode set to false" do
-    exprs = [
-      {:text, 1, 1, ' '},
-      {:expr, 1, 2, '=', ' 12 '},
-      {:text, 1, 11, ' \n'},
-      {:eof, 2, 1}
-    ]
-
-    assert T.tokenize(' <%= 12 %> \n', 1, 1, %{@opts | trim: false}) == {:ok, exprs}
-  end
-
-  test "trim mode no false positives" do
-    assert_not_trimmed = fn x ->
-      assert T.tokenize(x, 1, 1, %{@opts | trim: false}) == T.tokenize(x, 1, 1, @opts)
+  test "raise syntax error when there is start mark and no end mark" do
+    assert_raise EEx.SyntaxError, "missing token: %>", fn ->
+      T.tokenize('foo <% :bar', 1)
    end
-
-    assert_not_trimmed.('foo <%= "bar" %>  ')
-    assert_not_trimmed.('\n  <%= "foo" %>bar')
-    assert_not_trimmed.('  <%% hello %>  ')
-    assert_not_trimmed.('  <%= 01 %><%= 23 %>\n')
-  end
-
-  test "returns error when there is start mark and no end mark" do
-    assert T.tokenize('foo <% :bar', 1, 1, @opts) == {:error, 1, 12, "missing token '%>'"}
-    assert T.tokenize('<%# true ', 1, 1, @opts) == {:error, 1, 10, "missing token '%>'"}
-  end
-
-  test "marks invalid expressions as regular expressions" do
-    assert T.tokenize('<% 1 $ 2 %>', 1, 1, @opts) ==
-             {:ok, [{:expr, 1, 1, [], ' 1 $ 2 '}, {:eof, 1, 12}]}
  end
 end
@@ -1 +0,0 @@
-foo <%= bar
@@ -1 +1,2 @@
-ExUnit.start(trace: "--trace" in System.argv())
+# Configure ExUnit, no options supported yet.
+ExUnit.start []
@@ -1,16 +0,0 @@
-{'src/*', [
-  warn_unused_vars,
-  warn_export_all,
-  warn_shadow_vars,
-  warn_unused_import,
-  warn_unused_function,
-  warn_bif_clash,
-  warn_unused_record,
-  warn_deprecated_function,
-  warn_obsolete_guard,
-  warn_exported_vars,
-  %% warn_missing_spec,
-  %% warn_untyped_record,
-  debug_info,
-  {outdir, "ebin/"}
-]}.
@@ -1,156 +0,0 @@
-defmodule Diff do
-  @moduledoc """
-  Utilities for comparing build artifacts.
-  """
-
-  @known_chunks ~w(
-    abstract_code
-    debug_info
-    attributes
-    compile_info
-    exports
-    labeled_exports
-    imports
-    indexed_imports
-    locals
-    labeled_locals
-    atoms
-  )a
-
-  @doc """
-  Compares the build artifacts of two build directories.
-  """
-  @spec compare_dirs(Path.t(), Path.t()) ::
-          {
-            only1_paths :: list(Path.t()),
-            only2_paths :: list(Path.t()),
-            diff :: list({Path.t(), diff :: String.t()})
-          }
-  def compare_dirs(dir1, dir2) do
-    dir1 = Path.expand(dir1)
-    dir2 = Path.expand(dir2)
-
-    assert_dir!(dir1)
-    assert_dir!(dir2)
-
-    dir1_paths = relative_paths(dir1)
-    dir2_paths = relative_paths(dir2)
-
-    only1_paths = dir1_paths -- dir2_paths
-    only2_paths = dir2_paths -- dir1_paths
-    common_paths = dir1_paths -- only1_paths
-    common_files = Enum.reject(common_paths, &File.dir?/1)
-
-    diff =
-      Enum.flat_map(common_files, fn path ->
-        file1 = Path.join(dir1, path)
-        file2 = Path.join(dir2, path)
-
-        case compare_files(file1, file2) do
-          :eq -> []
-          {:diff, diff} -> [{path, diff}]
-        end
-      end)
-
-    {only1_paths, only2_paths, diff}
-  end
-
-  @doc """
-  Compares the contents of two files.
-
-  If the files are BEAM files, it performs a more human-friendly
-  "BEAM-diff".
-  """
-  @spec compare_files(Path.t(), Path.t()) :: :eq | {:diff, diff :: String.t()}
-  def compare_files(file1, file2) do
-    content1 = File.read!(file1)
-    content2 = File.read!(file2)
-
-    if content1 == content2 do
-      :eq
-    else
-      diff =
-        if String.ends_with?(file1, ".beam") do
-          beam_diff(file1, content1, file2, content2)
-        else
-          file_diff(file1, file2)
-        end
-
-      {:diff, diff}
-    end
-  end
-
-  defp beam_diff(file1, content1, file2, content2) do
-    with {:ok, {module, chunks1}} <- :beam_lib.chunks(content1, @known_chunks),
-         {:ok, {^module, chunks2}} <- :beam_lib.chunks(content2, @known_chunks),
-         true <- chunks1 != chunks2 do
-      for {chunk1, chunk2} <- Enum.zip(chunks1, chunks2), chunk1 != chunk2 do
-        tmp_file1 =
-          chunk1
-          |> inspect(pretty: true, limit: :infinity)
-          |> write_tmp()
-
-        tmp_file2 =
-          chunk2
-          |> inspect(pretty: true, limit: :infinity)
-          |> write_tmp()
-
-        file_diff(tmp_file1, tmp_file2)
-      end
-    else
-      _ ->
-        file_diff(file1, file2)
-    end
-  end
-
-  defp file_diff(file1, file2) do
-    {diff, _} = System.cmd("diff", [file1, file2])
-    diff
-  end
-
-  defp relative_paths(dir) do
-    dir
-    |> Path.join("**")
-    |> Path.wildcard()
-    |> Enum.map(&Path.relative_to(&1, dir))
-  end
-
-  defp assert_dir!(dir) do
-    unless File.dir?(dir) do
-      raise ArgumentError, "#{inspect(dir)} is not a directory"
-    end
-  end
-
-  defp write_tmp(content) do
-    filename = generate_tmp_filename()
-    File.mkdir_p!("tmp")
-    File.write!(Path.join("tmp", filename), content)
-    Path.join("tmp", filename)
-  end
-
-  defp generate_tmp_filename do
-    sec = :os.system_time(:second)
-    rand = :rand.uniform(999_999_999)
-    scheduler_id = :erlang.system_info(:scheduler_id)
-    "tmp-#{sec}-#{rand}-#{scheduler_id}"
-  end
-end
-
-case System.argv() do
-  [dir1, dir2] ->
-    case Diff.compare_dirs(dir1, dir2) do
-      {[], [], []} ->
-        IO.puts("#{inspect(dir1)} and #{inspect(dir2)} are equal")
-
-      {only1, only2, diff} ->
-        for path <- only1, do: IO.puts("Only in #{dir1}: #{path}")
-        for path <- only2, do: IO.puts("Only in #{dir2}: #{path}")
-        for {path, diff} <- diff, do: IO.puts("Diff #{path}:\n#{diff}")
-
-        System.halt(1)
-    end
-
-  _ ->
-    IO.puts("Please, provide two directories as arguments")
-    System.halt(1)
-end
@@ -1,117 +0,0 @@
-# Returns config for Elixir docs
-
-canonical = System.fetch_env!("CANONICAL")
-
-[
-  extras: Path.wildcard("lib/elixir/pages/*.md") ++ ["CHANGELOG.md"],
-  deps: [
-    eex: "https://hexdocs.pm/eex/#{canonical}",
-    ex_unit: "https://hexdocs.pm/ex_unit/#{canonical}",
-    iex: "https://hexdocs.pm/iex/#{canonical}",
-    logger: "https://hexdocs.pm/logger/#{canonical}",
-    mix: "https://hexdocs.pm/mix/#{canonical}"
-  ],
-  groups_for_functions: [
-    Guards: &(&1[:guard] == true)
-  ],
-  skip_undefined_reference_warnings_on: ["lib/elixir/pages/compatibility-and-deprecations.md"],
-  groups_for_modules: [
-    # [Kernel, Kernel.SpecialForms],
-
-    "Basic Types": [
-      Atom,
-      Base,
-      Bitwise,
-      Date,
-      DateTime,
-      Exception,
-      Float,
-      Function,
-      Integer,
-      Module,
-      NaiveDateTime,
-      Record,
-      Regex,
-      String,
-      Time,
-      Tuple,
-      URI,
-      Version,
-      Version.Requirement
-    ],
-    "Collections & Enumerables": [
-      Access,
-      Date.Range,
-      Enum,
-      Keyword,
-      List,
-      Map,
-      MapSet,
-      Range,
-      Stream
-    ],
-    "IO & System": [
-      File,
-      File.Stat,
-      File.Stream,
-      IO,
-      IO.ANSI,
-      IO.Stream,
-      OptionParser,
-      Path,
-      Port,
-      StringIO,
-      System
-    ],
-    Calendar: [
-      Calendar,
-      Calendar.ISO,
-      Calendar.TimeZoneDatabase,
-      Calendar.UTCOnlyTimeZoneDatabase
-    ],
-    "Processes & Applications": [
-      Agent,
-      Application,
-      Config,
-      Config.Provider,
-      Config.Reader,
-      DynamicSupervisor,
-      GenServer,
-      Node,
-      Process,
-      Registry,
-      Supervisor,
-      Task,
-      Task.Supervisor
-    ],
-    Protocols: [
-      Collectable,
-      Enumerable,
-      Inspect,
-      Inspect.Algebra,
-      Inspect.Opts,
-      List.Chars,
-      Protocol,
-      String.Chars
-    ],
-    "Code & Macros": [
-      Code,
-      Code.Fragment,
-      Kernel.ParallelCompiler,
-      Macro,
-      Macro.Env
-    ]
-
-    ## Automatically detected groups
-
-    # Deprecated: [
-    #   Behaviour,
-    #   Dict,
-    #   GenEvent,
-    #   HashDict,
-    #   HashSet,
-    #   Set,
-    #   Supervisor.Spec
-    # ]
-  ]
-]
@@ -1,13 +0,0 @@
-#!/usr/bin/env escript
-%% -*- erlang -*-
-
-main([Source, Target, Version]) ->
-  {ok, [{application, Name, Props0}]} = file:consult(Source),
-  Ebin = filename:dirname(Target),
-  Files = filelib:wildcard(filename:join(Ebin, "*.beam")),
-  Mods = [list_to_atom(filename:basename(F, ".beam")) || F <- Files],
-  Props1 = lists:keyreplace(modules, 1, Props0, {modules, Mods}),
-  Props = lists:keyreplace(vsn, 1, Props1, {vsn, Version}),
-  AppDef = io_lib:format("~tp.~n", [{application, Name, Props}]),
-  ok = file:write_file(Target, AppDef),
-  io:format("Generated ~ts app~n", [Name]).
@@ -0,0 +1,39 @@
+-define(ELIXIR_WRAP_CALL(Line, Module, Function, Args),
+  { call, Line,
+    { remote, Line, { atom, Line, Module }, { atom, Line, Function } },
+    Args
+  }).
+
+-define(ELIXIR_ATOM_CONCAT(Atoms), list_to_atom(lists:concat(Atoms))).
+-define(ELIXIR_MACRO(Macro), list_to_atom(lists:concat(['MACRO-',Macro]))).
+
+-record(elixir_scope, {
+  context=nil,                                   %% can be assign, guards or nil
+  noname=false,                                  %% when true, don't add new names (used by try)
+  check_clauses=true,                            %% when true, check def clauses ordering
+  super=false,                                   %% when true, it means super was invoked
+  caller=false,                                  %% when true, it means caller was invoked
+  name_args=false,                               %% when true, it means arguments should be named
+  macro=[],                                      %% a stack with macros nesting
+  module=nil,                                    %% the current module
+  function=nil,                                  %% the current function
+  recur=nil,                                     %% the current loop function to be recurred
+  vars=dict:new(),                               %% a dict of defined variables and their alias
+  temp_vars=dict:new(),                          %% a dict of all variables defined in a particular assign
+  clause_vars=dict:new(),                        %% a dict of all variables defined in a particular clause
+  quote_vars=dict:new(),                         %% a dict of all quoted variables
+  extra_guards=nil,                              %% extra guards from args expansion
+  counter=0,                                     %% a counter for the variables defined
+  file=(<<"nofile">>),                           %% the current scope filename
+  local=nil,                                     %% the scope to evaluate local functions against
+  aliases=[],                                    %% an orddict with aliases by new -> old names
+  requires=elixir_dispatch:default_requires(),   %% a set with modules required
+  macros=elixir_dispatch:default_macros(),       %% a list with macros imported by module
+  functions=elixir_dispatch:default_functions(), %% a list with functions imported by module
+  scheduled=[]}).                                %% scheduled modules to be loaded
+
+-record(elixir_quote, {
+  line=0,
+  marker=quoted,
+  unquote=true
+}).
@@ -1,829 +1,66 @@
-defmodule Access do
+import Kernel, except: [access: 2]
+
+defprotocol Access do
  @moduledoc """
-  Key-based access to data structures.
+  The Access protocol is the underlying protocol invoked
+  when the brackets syntax is used. For instance, `foo[bar]`
+  is translated to `access foo, bar` which, by default,
+  invokes `Access.access` protocol.

-  The `Access` module defines a behaviour for dynamically accessing
-  keys of any type in a data structure via the `data[key]` syntax.
-
-  `Access` supports keyword lists (`Keyword`) and maps (`Map`) out
-  of the box. Keywords supports only atoms keys, keys for maps can
-  be of any type. Both return `nil` if the key does not exist:
-
-      iex> keywords = [a: 1, b: 2]
-      iex> keywords[:a]
-      1
-      iex> keywords[:c]
-      nil
-
-      iex> map = %{a: 1, b: 2}
-      iex> map[:a]
-      1
-
-      iex> star_ratings = %{1.0 => "★", 1.5 => "★☆", 2.0 => "★★"}
-      iex> star_ratings[1.5]
-      "★☆"
-
-  This syntax is very convenient as it can be nested arbitrarily:
-
-      iex> keywords = [a: 1, b: 2]
-      iex> keywords[:c][:unknown]
-      nil
-
-  This works because accessing anything on a `nil` value, returns
-  `nil` itself:
-
-      iex> nil[:a]
-      nil
-
-  The access syntax can also be used with the `Kernel.put_in/2`,
-  `Kernel.update_in/2` and `Kernel.get_and_update_in/2` macros
-  to allow values to be set in nested data structures:
-
-      iex> users = %{"john" => %{age: 27}, "meg" => %{age: 23}}
-      iex> put_in(users["john"][:age], 28)
-      %{"john" => %{age: 28}, "meg" => %{age: 23}}
-
-  > Attention! While the access syntax is allowed in maps via
-  > `map[key]`, if your map is made of predefined atom keys,
-  > you should prefer to access those atom keys with `map.key`
-  > instead of `map[key]`, as `map.key` will raise if the key
-  > is missing (which is not supposed to happen if the keys are
-  > predefined). Similarly, since structs are maps and structs
-  > have predefined keys, they only allow the `struct.key`
-  > syntax and they do not allow the `struct[key]` access syntax.
-  > See the `Map` module for more information.
-
-  ## Nested data structures
-
-  Both key-based access syntaxes can be used with the nested update
-  functions and macros in `Kernel`, such as `Kernel.get_in/2`,
-  `Kernel.put_in/3`, `Kernel.update_in/3`, `Kernel.pop_in/2`, and
-  `Kernel.get_and_update_in/3`.
-
-  For example, to update a map inside another map:
-
-      iex> users = %{"john" => %{age: 27}, "meg" => %{age: 23}}
-      iex> put_in(users["john"].age, 28)
-      %{"john" => %{age: 28}, "meg" => %{age: 23}}
-
-  This module provides convenience functions for traversing other
-  structures, like tuples and lists. These functions can be used
-  in all the `Access`-related functions and macros in `Kernel`.
-
-  For instance, given a user map with the `:name` and `:languages`
-  keys, here is how to deeply traverse the map and convert all
-  language names to uppercase:
-
-      iex> languages = [
-      ...>   %{name: "elixir", type: :functional},
-      ...>   %{name: "c", type: :procedural}
-      ...> ]
-      iex> user = %{name: "john", languages: languages}
-      iex> update_in(user, [:languages, Access.all(), :name], &String.upcase/1)
-      %{
-        name: "john",
-        languages: [
-          %{name: "ELIXIR", type: :functional},
-          %{name: "C", type: :procedural}
-        ]
-      }
-
-  See the functions `key/1`, `key!/1`, `elem/1`, and `all/0` for
-  some of the available accessors.
+  This protocol is limited and is implemented only for the
+  following built-in types: keywords, tuples, atoms and
+  functions.
  """

-  @type container :: keyword | struct | map
-  @type nil_container :: nil
-  @type any_container :: any
-  @type t :: container | nil_container | any_container
-  @type key :: any
-  @type value :: any
-
-  @type get_fun(data) ::
-          (:get, data, (term -> term) -> new_data :: container)
-
-  @type get_and_update_fun(data, current_value) ::
-          (:get_and_update, data, (term -> term) ->
-             {current_value, new_data :: container} | :pop)
-
-  @type access_fun(data, current_value) ::
-          get_fun(data) | get_and_update_fun(data, current_value)
+  @only [List, Function, Record, Atom]

  @doc """
-  Invoked in order to access the value stored under `key` in the given term `term`.
-
-  This function should return `{:ok, value}` where `value` is the value under
-  `key` if the key exists in the term, or `:error` if the key does not exist in
-  the term.
-
-  Many of the functions defined in the `Access` module internally call this
-  function. This function is also used when the square-brackets access syntax
-  (`structure[key]`) is used: the `fetch/2` callback implemented by the module
-  that defines the `structure` struct is invoked and if it returns `{:ok,
-  value}` then `value` is returned, or if it returns `:error` then `nil` is
-  returned.
-
-  See the `Map.fetch/2` and `Keyword.fetch/2` implementations for examples of
-  how to implement this callback.
+  Receives the element being accessed and the access item.
  """
-  @callback fetch(term :: t, key) :: {:ok, value} | :error
+  def access(element, qualifier)
+end

+defimpl Access, for: List do
  @doc """
-  Invoked in order to access the value under `key` and update it at the same time.
+  Access the given key in a keywords list.

-  The implementation of this callback should invoke `fun` with the value under
-  `key` in the passed structure `data`, or with `nil` if `key` is not present in it.
-  This function must return either `{current_value, new_value}` or `:pop`.
+  ## Examples

-  If the passed function returns `{current_value, new_value}`,
-  the return value of this callback should be `{current_value, new_data}`, where:
+      keywords = [a: 1, b: 2]
+      keywords[:a] #=> 1

-    * `current_value` is the retrieved value (which can be operated on before being returned)
-
-    * `new_value` is the new value to be stored under `key`
-
-    * `new_data` is `data` after updating the value of `key` with `new_value`.
-
-  If the passed function returns `:pop`, the return value of this callback
-  must be `{value, new_data}` where `value` is the value under `key`
-  (or `nil` if not present) and `new_data` is `data` without `key`.
-
-  See the implementations of `Map.get_and_update/3` or `Keyword.get_and_update/3`
-  for more examples.
  """
-  @callback get_and_update(data, key, (value | nil -> {current_value, new_value :: value} | :pop)) ::
-              {current_value, new_data :: data}
-            when current_value: value, data: container | any_container

+  def access(list, atom) when is_atom(atom) do
+    atom_access(list, atom)
+  end
+
+  defp atom_access([{k, _}|_], key) when key < k, do: nil
+  defp atom_access([{k, _}|d], key) when key > k, do: atom_access(d, key)
+  defp atom_access([{_k, value}|_], _key),        do: value
+  defp atom_access([], _),                        do: nil
+end
+
+defimpl Access, for: Atom do
  @doc """
-  Invoked to "pop" the value under `key` out of the given data structure.
-
-  When `key` exists in the given structure `data`, the implementation should
-  return a `{value, new_data}` tuple where `value` is the value that was under
-  `key` and `new_data` is `term` without `key`.
-
-  When `key` is not present in the given structure, a tuple `{value, data}`
-  should be returned, where `value` is implementation-defined.
-
-  See the implementations for `Map.pop/3` or `Keyword.pop/3` for more examples.
+  The access protocol can only be accessed by atoms
+  at compilation time. If we reach this, we should raise
+  an exception.
  """
-  @callback pop(data, key) :: {value, data} when data: container | any_container
-
-  defmacrop raise_undefined_behaviour(exception, module, top) do
-    quote do
-      exception =
-        case __STACKTRACE__ do
-          [unquote(top) | _] ->
-            reason = "#{inspect(unquote(module))} does not implement the Access behaviour"
-            %{unquote(exception) | reason: reason}
-
-          _ ->
-            unquote(exception)
-        end
-
-      reraise exception, __STACKTRACE__
-    end
-  end
-
-  @doc """
-  Fetches the value for the given key in a container (a map, keyword
-  list, or struct that implements the `Access` behaviour).
-
-  Returns `{:ok, value}` where `value` is the value under `key` if there is such
-  a key, or `:error` if `key` is not found.
-
-  ## Examples
-
-      iex> Access.fetch(%{name: "meg", age: 26}, :name)
-      {:ok, "meg"}
-
-      iex> Access.fetch([ordered: true, on_timeout: :exit], :timeout)
-      :error
-
-  """
-  @spec fetch(container, term) :: {:ok, term} | :error
-  @spec fetch(nil_container, any) :: :error
-  def fetch(container, key)
-
-  def fetch(%module{} = container, key) do
-    module.fetch(container, key)
-  rescue
-    exception in UndefinedFunctionError ->
-      raise_undefined_behaviour(exception, module, {^module, :fetch, [^container, ^key], _})
-  end
-
-  def fetch(map, key) when is_map(map) do
-    case map do
-      %{^key => value} -> {:ok, value}
-      _ -> :error
-    end
-  end
-
-  def fetch(list, key) when is_list(list) and is_atom(key) do
-    case :lists.keyfind(key, 1, list) do
-      {_, value} -> {:ok, value}
-      false -> :error
-    end
-  end
-
-  def fetch(list, key) when is_list(list) do
-    raise ArgumentError,
-          "the Access calls for keywords expect the key to be an atom, got: " <> inspect(key)
-  end
-
-  def fetch(nil, _key) do
-    :error
-  end
-
-  @doc """
-  Same as `fetch/2` but returns the value directly,
-  or raises a `KeyError` exception if `key` is not found.
-
-  ## Examples
-
-      iex> Access.fetch!(%{name: "meg", age: 26}, :name)
-      "meg"
-
-  """
-  @doc since: "1.10.0"
-  @spec fetch!(container, term) :: term
-  def fetch!(container, key) do
-    case fetch(container, key) do
-      {:ok, value} -> value
-      :error -> raise(KeyError, key: key, term: container)
-    end
-  end
-
-  @doc """
-  Gets the value for the given key in a container (a map, keyword
-  list, or struct that implements the `Access` behaviour).
-
-  Returns the value under `key` if there is such a key, or `default` if `key` is
-  not found.
-
-  ## Examples
-
-      iex> Access.get(%{name: "john"}, :name, "default name")
-      "john"
-      iex> Access.get(%{name: "john"}, :age, 25)
-      25
-
-      iex> Access.get([ordered: true], :timeout)
-      nil
-
-  """
-  @spec get(container, term, term) :: term
-  @spec get(nil_container, any, default) :: default when default: var
-  def get(container, key, default \\ nil)
-
-  # Reimplementing the same logic as Access.fetch/2 here is done for performance, since
-  # this is called a lot and calling fetch/2 means introducing some overhead (like
-  # building the "{:ok, _}" tuple and deconstructing it back right away).
-
-  def get(%module{} = container, key, default) do
-    try do
-      module.fetch(container, key)
-    rescue
-      exception in UndefinedFunctionError ->
-        raise_undefined_behaviour(exception, module, {^module, :fetch, [^container, ^key], _})
-    else
-      {:ok, value} -> value
-      :error -> default
-    end
-  end
-
-  def get(map, key, default) when is_map(map) do
-    case map do
-      %{^key => value} -> value
-      _ -> default
-    end
-  end
-
-  def get(list, key, default) when is_list(list) and is_atom(key) do
-    case :lists.keyfind(key, 1, list) do
-      {_, value} -> value
-      false -> default
-    end
-  end
-
-  def get(list, key, _default) when is_list(list) do
-    raise ArgumentError,
-          "the Access calls for keywords expect the key to be an atom, got: " <> inspect(key)
-  end
-
-  def get(nil, _key, default) do
-    default
-  end
-
-  @doc """
-  Gets and updates the given key in a `container` (a map, a keyword list,
-  a struct that implements the `Access` behaviour).
-
-  The `fun` argument receives the value of `key` (or `nil` if `key` is not
-  present in `container`) and must return a two-element tuple `{current_value, new_value}`:
-  the "get" value `current_value` (the retrieved value, which can be operated on before
-  being returned) and the new value to be stored under `key` (`new_value`).
-  `fun` may also return `:pop`, which means the current value
-  should be removed from the container and returned.
-
-  The returned value is a two-element tuple with the "get" value returned by
-  `fun` and a new container with the updated value under `key`.
-
-  ## Examples
-
-      iex> Access.get_and_update([a: 1], :a, fn current_value ->
-      ...>   {current_value, current_value + 1}
-      ...> end)
-      {1, [a: 2]}
-
-  """
-  @spec get_and_update(data, key, (value | nil -> {current_value, new_value :: value} | :pop)) ::
-          {current_value, new_data :: data}
-        when current_value: var, data: container
-  def get_and_update(container, key, fun)
-
-  def get_and_update(%module{} = container, key, fun) do
-    module.get_and_update(container, key, fun)
-  rescue
-    exception in UndefinedFunctionError ->
-      raise_undefined_behaviour(
-        exception,
-        module,
-        {^module, :get_and_update, [^container, ^key, ^fun], _}
-      )
-  end
-
-  def get_and_update(map, key, fun) when is_map(map) do
-    Map.get_and_update(map, key, fun)
-  end
-
-  def get_and_update(list, key, fun) when is_list(list) do
-    Keyword.get_and_update(list, key, fun)
-  end
-
-  def get_and_update(nil, key, _fun) do
-    raise ArgumentError, "could not put/update key #{inspect(key)} on a nil value"
+  def access(atom, _) do
+    raise "The access protocol can only be invoked for atoms at " <>
+      "compilation time, tried to invoke it for #{inspect atom}"
  end
+end

+defimpl Access, for: Function do
  @doc """
-  Removes the entry with a given key from a container (a map, keyword
-  list, or struct that implements the `Access` behaviour).
-
-  Returns a tuple containing the value associated with the key and the
-  updated container. `nil` is returned for the value if the key isn't
-  in the container.
-
-  ## Examples
-
-  With a map:
-
-      iex> Access.pop(%{name: "Elixir", creator: "Valim"}, :name)
-      {"Elixir", %{creator: "Valim"}}
-
-  A keyword list:
-
-      iex> Access.pop([name: "Elixir", creator: "Valim"], :name)
-      {"Elixir", [creator: "Valim"]}
-
-  An unknown key:
-
-      iex> Access.pop(%{name: "Elixir", creator: "Valim"}, :year)
-      {nil, %{creator: "Valim", name: "Elixir"}}
-
-  """
-  @spec pop(data, key) :: {value, data} when data: container
-  def pop(%module{} = container, key) do
-    module.pop(container, key)
-  rescue
-    exception in UndefinedFunctionError ->
-      raise_undefined_behaviour(exception, module, {^module, :pop, [^container, ^key], _})
-  end
-
-  def pop(map, key) when is_map(map) do
-    Map.pop(map, key)
-  end
-
-  def pop(list, key) when is_list(list) do
-    Keyword.pop(list, key)
-  end
-
-  def pop(nil, key) do
-    raise ArgumentError, "could not pop key #{inspect(key)} on a nil value"
-  end
-
-  ## Accessors
-
-  @doc """
-  Returns a function that accesses the given key in a map/struct.
-
-  The returned function is typically passed as an accessor to `Kernel.get_in/2`,
-  `Kernel.get_and_update_in/3`, and friends.
-
-  The returned function uses the default value if the key does not exist.
-  This can be used to specify defaults and safely traverse missing keys:
-
-      iex> get_in(%{}, [Access.key(:user, %{}), Access.key(:name, "meg")])
-      "meg"
-
-  Such is also useful when using update functions, allowing us to introduce
-  values as we traverse the data structure for updates:
-
-      iex> put_in(%{}, [Access.key(:user, %{}), Access.key(:name)], "Mary")
-      %{user: %{name: "Mary"}}
-
-  ## Examples
-
-      iex> map = %{user: %{name: "john"}}
-      iex> get_in(map, [Access.key(:unknown, %{}), Access.key(:name, "john")])
-      "john"
-      iex> get_and_update_in(map, [Access.key(:user), Access.key(:name)], fn prev ->
-      ...>   {prev, String.upcase(prev)}
-      ...> end)
-      {"john", %{user: %{name: "JOHN"}}}
-      iex> pop_in(map, [Access.key(:user), Access.key(:name)])
-      {"john", %{user: %{}}}
-
-  An error is raised if the accessed structure is not a map or a struct:
-
-      iex> get_in([], [Access.key(:foo)])
-      ** (BadMapError) expected a map, got: []
-
-  """
-  @spec key(key, term) :: access_fun(data :: struct | map, current_value :: term)
-  def key(key, default \\ nil) do
-    fn
-      :get, data, next ->
-        next.(Map.get(data, key, default))
-
-      :get_and_update, data, next ->
-        value = Map.get(data, key, default)
-
-        case next.(value) do
-          {get, update} -> {get, Map.put(data, key, update)}
-          :pop -> {value, Map.delete(data, key)}
-        end
-    end
-  end
-
-  @doc """
-  Returns a function that accesses the given key in a map/struct.
-
-  The returned function is typically passed as an accessor to `Kernel.get_in/2`,
-  `Kernel.get_and_update_in/3`, and friends.
-
-  Similar to `key/2`, but the returned function raises if the key does not exist.
-
-  ## Examples
-
-      iex> map = %{user: %{name: "john"}}
-      iex> get_in(map, [Access.key!(:user), Access.key!(:name)])
-      "john"
-      iex> get_and_update_in(map, [Access.key!(:user), Access.key!(:name)], fn prev ->
-      ...>   {prev, String.upcase(prev)}
-      ...> end)
-      {"john", %{user: %{name: "JOHN"}}}
-      iex> pop_in(map, [Access.key!(:user), Access.key!(:name)])
-      {"john", %{user: %{}}}
-      iex> get_in(map, [Access.key!(:user), Access.key!(:unknown)])
-      ** (KeyError) key :unknown not found in: %{name: \"john\"}
-
-  An error is raised if the accessed structure is not a map/struct:
-
-      iex> get_in([], [Access.key!(:foo)])
-      ** (RuntimeError) Access.key!/1 expected a map/struct, got: []
-
+  The Access protocol for functions simply invokes
+  the function passing the item as argument. This
+  is useful because it allows a function to be
+  passed as argument in places a dict would also fit.
  """
-  @spec key!(key) :: access_fun(data :: struct | map, current_value :: term)
-  def key!(key) do
-    fn
-      :get, %{} = data, next ->
-        next.(Map.fetch!(data, key))
-
-      :get_and_update, %{} = data, next ->
-        value = Map.fetch!(data, key)
-
-        case next.(value) do
-          {get, update} -> {get, Map.put(data, key, update)}
-          :pop -> {value, Map.delete(data, key)}
-        end
-
-      _op, data, _next ->
-        raise "Access.key!/1 expected a map/struct, got: #{inspect(data)}"
-    end
-  end
-
-  @doc ~S"""
-  Returns a function that accesses the element at the given index in a tuple.
-
-  The returned function is typically passed as an accessor to `Kernel.get_in/2`,
-  `Kernel.get_and_update_in/3`, and friends.
-
-  The returned function raises if `index` is out of bounds.
-
-  Note that popping elements out of tuples is not possible and raises an
-  error.
-
-  ## Examples
-
-      iex> map = %{user: {"john", 27}}
-      iex> get_in(map, [:user, Access.elem(0)])
-      "john"
-      iex> get_and_update_in(map, [:user, Access.elem(0)], fn prev ->
-      ...>   {prev, String.upcase(prev)}
-      ...> end)
-      {"john", %{user: {"JOHN", 27}}}
-      iex> pop_in(map, [:user, Access.elem(0)])
-      ** (RuntimeError) cannot pop data from a tuple
-
-  An error is raised if the accessed structure is not a tuple:
-
-      iex> get_in(%{}, [Access.elem(0)])
-      ** (RuntimeError) Access.elem/1 expected a tuple, got: %{}
-
-  """
-  @spec elem(non_neg_integer) :: access_fun(data :: tuple, current_value :: term)
-  def elem(index) when is_integer(index) and index >= 0 do
-    pos = index + 1
-
-    fn
-      :get, data, next when is_tuple(data) ->
-        next.(:erlang.element(pos, data))
-
-      :get_and_update, data, next when is_tuple(data) ->
-        value = :erlang.element(pos, data)
-
-        case next.(value) do
-          {get, update} -> {get, :erlang.setelement(pos, data, update)}
-          :pop -> raise "cannot pop data from a tuple"
-        end
-
-      _op, data, _next ->
-        raise "Access.elem/1 expected a tuple, got: #{inspect(data)}"
-    end
-  end
-
-  @doc ~S"""
-  Returns a function that accesses all the elements in a list.
-
-  The returned function is typically passed as an accessor to `Kernel.get_in/2`,
-  `Kernel.get_and_update_in/3`, and friends.
-
-  ## Examples
-
-      iex> list = [%{name: "john"}, %{name: "mary"}]
-      iex> get_in(list, [Access.all(), :name])
-      ["john", "mary"]
-      iex> get_and_update_in(list, [Access.all(), :name], fn prev ->
-      ...>   {prev, String.upcase(prev)}
-      ...> end)
-      {["john", "mary"], [%{name: "JOHN"}, %{name: "MARY"}]}
-      iex> pop_in(list, [Access.all(), :name])
-      {["john", "mary"], [%{}, %{}]}
-
-  Here is an example that traverses the list dropping even
-  numbers and multiplying odd numbers by 2:
-
-      iex> require Integer
-      iex> get_and_update_in([1, 2, 3, 4, 5], [Access.all()], fn num ->
-      ...>   if Integer.is_even(num), do: :pop, else: {num, num * 2}
-      ...> end)
-      {[1, 2, 3, 4, 5], [2, 6, 10]}
-
-  An error is raised if the accessed structure is not a list:
-
-      iex> get_in(%{}, [Access.all()])
-      ** (RuntimeError) Access.all/0 expected a list, got: %{}
-
-  """
-  @spec all() :: access_fun(data :: list, current_value :: list)
-  def all() do
-    &all/3
-  end
-
-  defp all(:get, data, next) when is_list(data) do
-    Enum.map(data, next)
-  end
-
-  defp all(:get_and_update, data, next) when is_list(data) do
-    all(data, next, _gets = [], _updates = [])
-  end
-
-  defp all(_op, data, _next) do
-    raise "Access.all/0 expected a list, got: #{inspect(data)}"
-  end
-
-  defp all([head | rest], next, gets, updates) do
-    case next.(head) do
-      {get, update} -> all(rest, next, [get | gets], [update | updates])
-      :pop -> all(rest, next, [head | gets], updates)
-    end
-  end
-
-  defp all([], _next, gets, updates) do
-    {:lists.reverse(gets), :lists.reverse(updates)}
-  end
-
-  @doc ~S"""
-  Returns a function that accesses the element at `index` (zero based) of a list.
-
-  The returned function is typically passed as an accessor to `Kernel.get_in/2`,
-  `Kernel.get_and_update_in/3`, and friends.
-
-  ## Examples
-
-      iex> list = [%{name: "john"}, %{name: "mary"}]
-      iex> get_in(list, [Access.at(1), :name])
-      "mary"
-      iex> get_in(list, [Access.at(-1), :name])
-      "mary"
-      iex> get_and_update_in(list, [Access.at(0), :name], fn prev ->
-      ...>   {prev, String.upcase(prev)}
-      ...> end)
-      {"john", [%{name: "JOHN"}, %{name: "mary"}]}
-      iex> get_and_update_in(list, [Access.at(-1), :name], fn prev ->
-      ...>   {prev, String.upcase(prev)}
-      ...> end)
-      {"mary", [%{name: "john"}, %{name: "MARY"}]}
-
-  `at/1` can also be used to pop elements out of a list or
-  a key inside of a list:
-
-      iex> list = [%{name: "john"}, %{name: "mary"}]
-      iex> pop_in(list, [Access.at(0)])
-      {%{name: "john"}, [%{name: "mary"}]}
-      iex> pop_in(list, [Access.at(0), :name])
-      {"john", [%{}, %{name: "mary"}]}
-
-  When the index is out of bounds, `nil` is returned and the update function is never called:
-
-      iex> list = [%{name: "john"}, %{name: "mary"}]
-      iex> get_in(list, [Access.at(10), :name])
-      nil
-      iex> get_and_update_in(list, [Access.at(10), :name], fn prev ->
-      ...>   {prev, String.upcase(prev)}
-      ...> end)
-      {nil, [%{name: "john"}, %{name: "mary"}]}
-
-  An error is raised if the accessed structure is not a list:
-
-      iex> get_in(%{}, [Access.at(1)])
-      ** (RuntimeError) Access.at/1 expected a list, got: %{}
-
-  """
-  @spec at(integer) :: access_fun(data :: list, current_value :: term)
-  def at(index) when is_integer(index) do
-    fn op, data, next -> at(op, data, index, next) end
-  end
-
-  defp at(:get, data, index, next) when is_list(data) do
-    data |> Enum.at(index) |> next.()
-  end
-
-  defp at(:get_and_update, data, index, next) when is_list(data) do
-    get_and_update_at(data, index, next, [], fn -> nil end)
-  end
-
-  defp at(_op, data, _index, _next) do
-    raise "Access.at/1 expected a list, got: #{inspect(data)}"
-  end
-
-  defp get_and_update_at([head | rest], 0, next, updates, _default_fun) do
-    case next.(head) do
-      {get, update} -> {get, :lists.reverse([update | updates], rest)}
-      :pop -> {head, :lists.reverse(updates, rest)}
-    end
-  end
-
-  defp get_and_update_at([_ | _] = list, index, next, updates, default_fun) when index < 0 do
-    list_length = length(list)
-
-    if list_length + index >= 0 do
-      get_and_update_at(list, list_length + index, next, updates, default_fun)
-    else
-      {default_fun.(), list}
-    end
-  end
-
-  defp get_and_update_at([head | rest], index, next, updates, default_fun) when index > 0 do
-    get_and_update_at(rest, index - 1, next, [head | updates], default_fun)
-  end
-
-  defp get_and_update_at([], _index, _next, updates, default_fun) do
-    {default_fun.(), :lists.reverse(updates)}
-  end
-
-  @doc ~S"""
-  Same as `at/1` except that it raises `Enum.OutOfBoundsError`
-  if the given index is out of bounds.
-
-  ## Examples
-
-      iex> get_in([:a, :b, :c], [Access.at!(2)])
-      :c
-      iex> get_in([:a, :b, :c], [Access.at!(3)])
-      ** (Enum.OutOfBoundsError) out of bounds error
-
-  """
-  @doc since: "1.11.0"
-  @spec at!(integer) :: access_fun(data :: list, current_value :: term)
-  def at!(index) when is_integer(index) do
-    fn op, data, next -> at!(op, data, index, next) end
-  end
-
-  defp at!(:get, data, index, next) when is_list(data) do
-    case Enum.fetch(data, index) do
-      {:ok, value} -> next.(value)
-      :error -> raise Enum.OutOfBoundsError
-    end
-  end
-
-  defp at!(:get_and_update, data, index, next) when is_list(data) do
-    get_and_update_at(data, index, next, [], fn -> raise Enum.OutOfBoundsError end)
-  end
-
-  defp at!(_op, data, _index, _next) do
-    raise "Access.at!/1 expected a list, got: #{inspect(data)}"
-  end
-
-  @doc ~S"""
-  Returns a function that accesses all elements of a list that match the provided predicate.
-
-  The returned function is typically passed as an accessor to `Kernel.get_in/2`,
-  `Kernel.get_and_update_in/3`, and friends.
-
-  ## Examples
-
-      iex> list = [%{name: "john", salary: 10}, %{name: "francine", salary: 30}]
-      iex> get_in(list, [Access.filter(&(&1.salary > 20)), :name])
-      ["francine"]
-      iex> get_and_update_in(list, [Access.filter(&(&1.salary <= 20)), :name], fn prev ->
-      ...>   {prev, String.upcase(prev)}
-      ...> end)
-      {["john"], [%{name: "JOHN", salary: 10}, %{name: "francine", salary: 30}]}
-
-  `filter/1` can also be used to pop elements out of a list or
-  a key inside of a list:
-
-      iex> list = [%{name: "john", salary: 10}, %{name: "francine", salary: 30}]
-      iex> pop_in(list, [Access.filter(&(&1.salary >= 20))])
-      {[%{name: "francine", salary: 30}], [%{name: "john", salary: 10}]}
-      iex> pop_in(list, [Access.filter(&(&1.salary >= 20)), :name])
-      {["francine"], [%{name: "john", salary: 10}, %{salary: 30}]}
-
-  When no match is found, an empty list is returned and the update function is never called
-
-      iex> list = [%{name: "john", salary: 10}, %{name: "francine", salary: 30}]
-      iex> get_in(list, [Access.filter(&(&1.salary >= 50)), :name])
-      []
-      iex> get_and_update_in(list, [Access.filter(&(&1.salary >= 50)), :name], fn prev ->
-      ...>   {prev, String.upcase(prev)}
-      ...> end)
-      {[], [%{name: "john", salary: 10}, %{name: "francine", salary: 30}]}
-
-  An error is raised if the predicate is not a function or is of the incorrect arity:
-
-      iex> get_in([], [Access.filter(5)])
-      ** (FunctionClauseError) no function clause matching in Access.filter/1
-
-  An error is raised if the accessed structure is not a list:
-
-      iex> get_in(%{}, [Access.filter(fn a -> a == 10 end)])
-      ** (RuntimeError) Access.filter/1 expected a list, got: %{}
-
-  """
-  @doc since: "1.6.0"
-  @spec filter((term -> boolean)) :: access_fun(data :: list, current_value :: list)
-  def filter(func) when is_function(func) do
-    fn op, data, next -> filter(op, data, func, next) end
-  end
-
-  defp filter(:get, data, func, next) when is_list(data) do
-    data |> Enum.filter(func) |> Enum.map(next)
-  end
-
-  defp filter(:get_and_update, data, func, next) when is_list(data) do
-    get_and_update_filter(data, func, next, [], [])
-  end
-
-  defp filter(_op, data, _func, _next) do
-    raise "Access.filter/1 expected a list, got: #{inspect(data)}"
-  end
-
-  defp get_and_update_filter([head | rest], func, next, updates, gets) do
-    if func.(head) do
-      case next.(head) do
-        {get, update} ->
-          get_and_update_filter(rest, func, next, [update | updates], [get | gets])
-
-        :pop ->
-          get_and_update_filter(rest, func, next, updates, [head | gets])
-      end
-    else
-      get_and_update_filter(rest, func, next, [head | updates], gets)
-    end
-  end
-
-  defp get_and_update_filter([], _func, _next, updates, gets) do
-    {:lists.reverse(gets), :lists.reverse(updates)}
+  def access(function, item) do
+    function.(item)
  end
 end
@@ -1,508 +0,0 @@
-defmodule Agent do
-  @moduledoc """
-  Agents are a simple abstraction around state.
-
-  Often in Elixir there is a need to share or store state that
-  must be accessed from different processes or by the same process
-  at different points in time.
-
-  The `Agent` module provides a basic server implementation that
-  allows state to be retrieved and updated via a simple API.
-
-  ## Examples
-
-  For example, the following agent implements a counter:
-
-      defmodule Counter do
-        use Agent
-
-        def start_link(initial_value) do
-          Agent.start_link(fn -> initial_value end, name: __MODULE__)
-        end
-
-        def value do
-          Agent.get(__MODULE__, & &1)
-        end
-
-        def increment do
-          Agent.update(__MODULE__, &(&1 + 1))
-        end
-      end
-
-  Usage would be:
-
-      Counter.start_link(0)
-      #=> {:ok, #PID<0.123.0>}
-
-      Counter.value()
-      #=> 0
-
-      Counter.increment()
-      #=> :ok
-
-      Counter.increment()
-      #=> :ok
-
-      Counter.value()
-      #=> 2
-
-  Thanks to the agent server process, the counter can be safely incremented
-  concurrently.
-
-  Agents provide a segregation between the client and server APIs (similar to
-  `GenServer`s). In particular, the functions passed as arguments to the calls to
-  `Agent` functions are invoked inside the agent (the server). This distinction
-  is important because you may want to avoid expensive operations inside the
-  agent, as they will effectively block the agent until the request is
-  fulfilled.
-
-  Consider these two examples:
-
-      # Compute in the agent/server
-      def get_something(agent) do
-        Agent.get(agent, fn state -> do_something_expensive(state) end)
-      end
-
-      # Compute in the agent/client
-      def get_something(agent) do
-        Agent.get(agent, & &1) |> do_something_expensive()
-      end
-
-  The first function blocks the agent. The second function copies all the state
-  to the client and then executes the operation in the client. One aspect to
-  consider is whether the data is large enough to require processing in the server,
-  at least initially, or small enough to be sent to the client cheaply. Another
-  factor is whether the data needs to be processed atomically: getting the
-  state and calling `do_something_expensive(state)` outside of the agent means
-  that the agent's state can be updated in the meantime. This is specially
-  important in case of updates as computing the new state in the client rather
-  than in the server can lead to race conditions if multiple clients are trying
-  to update the same state to different values.
-
-  ## How to supervise
-
-  An `Agent` is most commonly started under a supervision tree.
-  When we invoke `use Agent`, it automatically defines a `child_spec/1`
-  function that allows us to start the agent directly under a supervisor.
-  To start an agent under a supervisor with an initial counter of 0,
-  one may do:
-
-      children = [
-        {Counter, 0}
-      ]
-
-      Supervisor.start_link(children, strategy: :one_for_all)
-
-  While one could also simply pass the `Counter` as a child to the supervisor,
-  such as:
-
-      children = [
-        Counter # Same as {Counter, []}
-      ]
-
-      Supervisor.start_link(children, strategy: :one_for_all)
-
-  The definition above wouldn't work for this particular example,
-  as it would attempt to start the counter with an initial value
-  of an empty list. However, this may be a viable option in your
-  own agents. A common approach is to use a keyword list, as that
-  would allow setting the initial value and giving a name to the
-  counter process, for example:
-
-      def start_link(opts) do
-        {initial_value, opts} = Keyword.pop(opts, :initial_value, 0)
-        Agent.start_link(fn -> initial_value end, opts)
-      end
-
-  and then you can use `Counter`, `{Counter, name: :my_counter}` or
-  even `{Counter, initial_value: 0, name: :my_counter}` as a child
-  specification.
-
-  `use Agent` also accepts a list of options which configures the
-  child specification and therefore how it runs under a supervisor.
-  The generated `child_spec/1` can be customized with the following options:
-
-    * `:id` - the child specification identifier, defaults to the current module
-    * `:restart` - when the child should be restarted, defaults to `:permanent`
-    * `:shutdown` - how to shut down the child, either immediately or by giving it time to shut down
-
-  For example:
-
-      use Agent, restart: :transient, shutdown: 10_000
-
-  See the "Child specification" section in the `Supervisor` module for more
-  detailed information. The `@doc` annotation immediately preceding
-  `use Agent` will be attached to the generated `child_spec/1` function.
-
-  ## Name registration
-
-  An agent is bound to the same name registration rules as GenServers.
-  Read more about it in the `GenServer` documentation.
-
-  ## A word on distributed agents
-
-  It is important to consider the limitations of distributed agents. Agents
-  provide two APIs, one that works with anonymous functions and another
-  that expects an explicit module, function, and arguments.
-
-  In a distributed setup with multiple nodes, the API that accepts anonymous
-  functions only works if the caller (client) and the agent have the same
-  version of the caller module.
-
-  Keep in mind this issue also shows up when performing "rolling upgrades"
-  with agents. By rolling upgrades we mean the following situation: you wish
-  to deploy a new version of your software by *shutting down* some of your
-  nodes and replacing them with nodes running a new version of the software.
-  In this setup, part of your environment will have one version of a given
-  module and the other part another version (the newer one) of the same module.
-
-  The best solution is to simply use the explicit module, function, and arguments
-  APIs when working with distributed agents.
-
-  ## Hot code swapping
-
-  An agent can have its code hot swapped live by simply passing a module,
-  function, and arguments tuple to the update instruction. For example, imagine
-  you have an agent named `:sample` and you want to convert its inner state
-  from a keyword list to a map. It can be done with the following
-  instruction:
-
-      {:update, :sample, {:advanced, {Enum, :into, [%{}]}}}
-
-  The agent's state will be added to the given list of arguments (`[%{}]`) as
-  the first argument.
-  """
-
-  @typedoc "Return values of `start*` functions"
-  @type on_start :: {:ok, pid} | {:error, {:already_started, pid} | term}
-
-  @typedoc "The agent name"
-  @type name :: atom | {:global, term} | {:via, module, term}
-
-  @typedoc "The agent reference"
-  @type agent :: pid | {atom, node} | name
-
-  @typedoc "The agent state"
-  @type state :: term
-
-  @doc """
-  Returns a specification to start an agent under a supervisor.
-
-  See the "Child specification" section in the `Supervisor` module for more detailed information.
-  """
-  @doc since: "1.5.0"
-  def child_spec(arg) do
-    %{
-      id: Agent,
-      start: {Agent, :start_link, [arg]}
-    }
-  end
-
-  @doc false
-  defmacro __using__(opts) do
-    quote location: :keep, bind_quoted: [opts: opts] do
-      unless Module.has_attribute?(__MODULE__, :doc) do
-        @doc """
-        Returns a specification to start this module under a supervisor.
-
-        See `Supervisor`.
-        """
-      end
-
-      def child_spec(arg) do
-        default = %{
-          id: __MODULE__,
-          start: {__MODULE__, :start_link, [arg]}
-        }
-
-        Supervisor.child_spec(default, unquote(Macro.escape(opts)))
-      end
-
-      defoverridable child_spec: 1
-    end
-  end
-
-  @doc """
-  Starts an agent linked to the current process with the given function.
-
-  This is often used to start the agent as part of a supervision tree.
-
-  Once the agent is spawned, the given function `fun` is invoked in the server
-  process, and should return the initial agent state. Note that `start_link/2`
-  does not return until the given function has returned.
-
-  ## Options
-
-  The `:name` option is used for registration as described in the module
-  documentation.
-
-  If the `:timeout` option is present, the agent is allowed to spend at most
-  the given number of milliseconds on initialization or it will be terminated
-  and the start function will return `{:error, :timeout}`.
-
-  If the `:debug` option is present, the corresponding function in the
-  [`:sys` module](`:sys`) will be invoked.
-
-  If the `:spawn_opt` option is present, its value will be passed as options
-  to the underlying process as in `Process.spawn/4`.
-
-  ## Return values
-
-  If the server is successfully created and initialized, the function returns
-  `{:ok, pid}`, where `pid` is the PID of the server. If an agent with the
-  specified name already exists, the function returns
-  `{:error, {:already_started, pid}}` with the PID of that process.
-
-  If the given function callback fails, the function returns `{:error, reason}`.
-
-  ## Examples
-
-      iex> {:ok, pid} = Agent.start_link(fn -> 42 end)
-      iex> Agent.get(pid, fn state -> state end)
-      42
-
-      iex> {:error, {exception, _stacktrace}} = Agent.start(fn -> raise "oops" end)
-      iex> exception
-      %RuntimeError{message: "oops"}
-
-  """
-  @spec start_link((() -> term), GenServer.options()) :: on_start
-  def start_link(fun, options \\ []) when is_function(fun, 0) do
-    GenServer.start_link(Agent.Server, fun, options)
-  end
-
-  @doc """
-  Starts an agent linked to the current process.
-
-  Same as `start_link/2` but a module, function, and arguments are expected
-  instead of an anonymous function; `fun` in `module` will be called with the
-  given arguments `args` to initialize the state.
-  """
-  @spec start_link(module, atom, [any], GenServer.options()) :: on_start
-  def start_link(module, fun, args, options \\ []) do
-    GenServer.start_link(Agent.Server, {module, fun, args}, options)
-  end
-
-  @doc """
-  Starts an agent process without links (outside of a supervision tree).
-
-  See `start_link/2` for more information.
-
-  ## Examples
-
-      iex> {:ok, pid} = Agent.start(fn -> 42 end)
-      iex> Agent.get(pid, fn state -> state end)
-      42
-
-  """
-  @spec start((() -> term), GenServer.options()) :: on_start
-  def start(fun, options \\ []) when is_function(fun, 0) do
-    GenServer.start(Agent.Server, fun, options)
-  end
-
-  @doc """
-  Starts an agent without links with the given module, function, and arguments.
-
-  See `start_link/4` for more information.
-  """
-  @spec start(module, atom, [any], GenServer.options()) :: on_start
-  def start(module, fun, args, options \\ []) do
-    GenServer.start(Agent.Server, {module, fun, args}, options)
-  end
-
-  @doc """
-  Gets an agent value via the given anonymous function.
-
-  The function `fun` is sent to the `agent` which invokes the function
-  passing the agent state. The result of the function invocation is
-  returned from this function.
-
-  `timeout` is an integer greater than zero which specifies how many
-  milliseconds are allowed before the agent executes the function and returns
-  the result value, or the atom `:infinity` to wait indefinitely. If no result
-  is received within the specified time, the function call fails and the caller
-  exits.
-
-  ## Examples
-
-      iex> {:ok, pid} = Agent.start_link(fn -> 42 end)
-      iex> Agent.get(pid, fn state -> state end)
-      42
-
-  """
-  @spec get(agent, (state -> a), timeout) :: a when a: var
-  def get(agent, fun, timeout \\ 5000) when is_function(fun, 1) do
-    GenServer.call(agent, {:get, fun}, timeout)
-  end
-
-  @doc """
-  Gets an agent value via the given function.
-
-  Same as `get/3` but a module, function, and arguments are expected
-  instead of an anonymous function. The state is added as first
-  argument to the given list of arguments.
-  """
-  @spec get(agent, module, atom, [term], timeout) :: any
-  def get(agent, module, fun, args, timeout \\ 5000) do
-    GenServer.call(agent, {:get, {module, fun, args}}, timeout)
-  end
-
-  @doc """
-  Gets and updates the agent state in one operation via the given anonymous
-  function.
-
-  The function `fun` is sent to the `agent` which invokes the function
-  passing the agent state. The function must return a tuple with two
-  elements, the first being the value to return (that is, the "get" value)
-  and the second one being the new state of the agent.
-
-  `timeout` is an integer greater than zero which specifies how many
-  milliseconds are allowed before the agent executes the function and returns
-  the result value, or the atom `:infinity` to wait indefinitely. If no result
-  is received within the specified time, the function call fails and the caller
-  exits.
-
-  ## Examples
-
-      iex> {:ok, pid} = Agent.start_link(fn -> 42 end)
-      iex> Agent.get_and_update(pid, fn state -> {state, state + 1} end)
-      42
-      iex> Agent.get(pid, fn state -> state end)
-      43
-
-  """
-  @spec get_and_update(agent, (state -> {a, state}), timeout) :: a when a: var
-  def get_and_update(agent, fun, timeout \\ 5000) when is_function(fun, 1) do
-    GenServer.call(agent, {:get_and_update, fun}, timeout)
-  end
-
-  @doc """
-  Gets and updates the agent state in one operation via the given function.
-
-  Same as `get_and_update/3` but a module, function, and arguments are expected
-  instead of an anonymous function. The state is added as first
-  argument to the given list of arguments.
-  """
-  @spec get_and_update(agent, module, atom, [term], timeout) :: any
-  def get_and_update(agent, module, fun, args, timeout \\ 5000) do
-    GenServer.call(agent, {:get_and_update, {module, fun, args}}, timeout)
-  end
-
-  @doc """
-  Updates the agent state via the given anonymous function.
-
-  The function `fun` is sent to the `agent` which invokes the function
-  passing the agent state. The return value of `fun` becomes the new
-  state of the agent.
-
-  This function always returns `:ok`.
-
-  `timeout` is an integer greater than zero which specifies how many
-  milliseconds are allowed before the agent executes the function and returns
-  the result value, or the atom `:infinity` to wait indefinitely. If no result
-  is received within the specified time, the function call fails and the caller
-  exits.
-
-  ## Examples
-
-      iex> {:ok, pid} = Agent.start_link(fn -> 42 end)
-      iex> Agent.update(pid, fn state -> state + 1 end)
-      :ok
-      iex> Agent.get(pid, fn state -> state end)
-      43
-
-  """
-  @spec update(agent, (state -> state), timeout) :: :ok
-  def update(agent, fun, timeout \\ 5000) when is_function(fun, 1) do
-    GenServer.call(agent, {:update, fun}, timeout)
-  end
-
-  @doc """
-  Updates the agent state via the given function.
-
-  Same as `update/3` but a module, function, and arguments are expected
-  instead of an anonymous function. The state is added as first
-  argument to the given list of arguments.
-
-  ## Examples
-
-      iex> {:ok, pid} = Agent.start_link(fn -> 42 end)
-      iex> Agent.update(pid, Kernel, :+, [12])
-      :ok
-      iex> Agent.get(pid, fn state -> state end)
-      54
-
-  """
-  @spec update(agent, module, atom, [term], timeout) :: :ok
-  def update(agent, module, fun, args, timeout \\ 5000) do
-    GenServer.call(agent, {:update, {module, fun, args}}, timeout)
-  end
-
-  @doc """
-  Performs a cast (*fire and forget*) operation on the agent state.
-
-  The function `fun` is sent to the `agent` which invokes the function
-  passing the agent state. The return value of `fun` becomes the new
-  state of the agent.
-
-  Note that `cast` returns `:ok` immediately, regardless of whether `agent` (or
-  the node it should live on) exists.
-
-  ## Examples
-
-      iex> {:ok, pid} = Agent.start_link(fn -> 42 end)
-      iex> Agent.cast(pid, fn state -> state + 1 end)
-      :ok
-      iex> Agent.get(pid, fn state -> state end)
-      43
-
-  """
-  @spec cast(agent, (state -> state)) :: :ok
-  def cast(agent, fun) when is_function(fun, 1) do
-    GenServer.cast(agent, {:cast, fun})
-  end
-
-  @doc """
-  Performs a cast (*fire and forget*) operation on the agent state.
-
-  Same as `cast/2` but a module, function, and arguments are expected
-  instead of an anonymous function. The state is added as first
-  argument to the given list of arguments.
-
-  ## Examples
-
-      iex> {:ok, pid} = Agent.start_link(fn -> 42 end)
-      iex> Agent.cast(pid, Kernel, :+, [12])
-      :ok
-      iex> Agent.get(pid, fn state -> state end)
-      54
-
-  """
-  @spec cast(agent, module, atom, [term]) :: :ok
-  def cast(agent, module, fun, args) do
-    GenServer.cast(agent, {:cast, {module, fun, args}})
-  end
-
-  @doc """
-  Synchronously stops the agent with the given `reason`.
-
-  It returns `:ok` if the agent terminates with the given
-  reason. If the agent terminates with another reason, the call will
-  exit.
-
-  This function keeps OTP semantics regarding error reporting.
-  If the reason is any other than `:normal`, `:shutdown` or
-  `{:shutdown, _}`, an error report will be logged.
-
-  ## Examples
-
-      iex> {:ok, pid} = Agent.start_link(fn -> 42 end)
-      iex> Agent.stop(pid)
-      :ok
-
-  """
-  @spec stop(agent, reason :: term, timeout) :: :ok
-  def stop(agent, reason \\ :normal, timeout \\ :infinity) do
-    GenServer.stop(agent, reason, timeout)
-  end
-end
@@ -1,51 +0,0 @@
-defmodule Agent.Server do
-  @moduledoc false
-
-  use GenServer
-
-  def init(fun) do
-    _ = initial_call(fun)
-    {:ok, run(fun, [])}
-  end
-
-  def handle_call({:get, fun}, _from, state) do
-    {:reply, run(fun, [state]), state}
-  end
-
-  def handle_call({:get_and_update, fun}, _from, state) do
-    case run(fun, [state]) do
-      {reply, state} -> {:reply, reply, state}
-      other -> {:stop, {:bad_return_value, other}, state}
-    end
-  end
-
-  def handle_call({:update, fun}, _from, state) do
-    {:reply, :ok, run(fun, [state])}
-  end
-
-  def handle_cast({:cast, fun}, state) do
-    {:noreply, run(fun, [state])}
-  end
-
-  def code_change(_old, state, fun) do
-    {:ok, run(fun, [state])}
-  end
-
-  defp initial_call(mfa) do
-    _ = Process.put(:"$initial_call", get_initial_call(mfa))
-    :ok
-  end
-
-  defp get_initial_call(fun) when is_function(fun, 0) do
-    {:module, module} = Function.info(fun, :module)
-    {:name, name} = Function.info(fun, :name)
-    {module, name, 0}
-  end
-
-  defp get_initial_call({mod, fun, args}) do
-    {mod, fun, length(args)}
-  end
-
-  defp run({m, f, a}, extra), do: apply(m, f, extra ++ a)
-  defp run(fun, extra), do: apply(fun, extra)
-end
@@ -1,82 +0,0 @@
-defmodule Atom do
-  @moduledoc """
-  Atoms are constants whose values are their own name.
-
-  They are often useful to enumerate over distinct values, such as:
-
-      iex> :apple
-      :apple
-      iex> :orange
-      :orange
-      iex> :watermelon
-      :watermelon
-
-  Atoms are equal if their names are equal.
-
-      iex> :apple == :apple
-      true
-      iex> :apple == :orange
-      false
-
-  Often they are used to express the state of an operation, by using
-  values such as `:ok` and `:error`.
-
-  The booleans `true` and `false` are also atoms:
-
-      iex> true == :true
-      true
-      iex> is_atom(false)
-      true
-      iex> is_boolean(:false)
-      true
-
-  Elixir allows you to skip the leading `:` for the atoms `false`, `true`,
-  and `nil`.
-
-  Atoms must be composed of Unicode characters such as letters, numbers,
-  underscore, and `@`. If the keyword has a character that does not
-  belong to the category above, such as spaces, you can wrap it in
-  quotes:
-
-      iex> :"this is an atom with spaces"
-      :"this is an atom with spaces"
-
-  """
-
-  @doc """
-  Converts an atom to a string.
-
-  Inlined by the compiler.
-
-  ## Examples
-
-      iex> Atom.to_string(:foo)
-      "foo"
-
-  """
-  @spec to_string(atom) :: String.t()
-  def to_string(atom) do
-    :erlang.atom_to_binary(atom, :utf8)
-  end
-
-  @doc """
-  Converts an atom to a charlist.
-
-  Inlined by the compiler.
-
-  ## Examples
-
-      iex> Atom.to_charlist(:"An atom")
-      'An atom'
-
-  """
-  @spec to_charlist(atom) :: charlist
-  def to_charlist(atom) do
-    :erlang.atom_to_list(atom)
-  end
-
-  @doc false
-  @deprecated "Use Atom.to_charlist/1 instead"
-  @spec to_char_list(atom) :: charlist
-  def to_char_list(atom), do: Atom.to_charlist(atom)
-end
@@ -1,123 +0,0 @@
-defmodule Behaviour do
-  @moduledoc """
-  Mechanism for handling behaviours.
-
-  This module is deprecated. Instead of `defcallback/1` and
-  `defmacrocallback/1`, the `@callback` and `@macrocallback`
-  module attributes can be used respectively. See the
-  documentation for `Module` for more information on these
-  attributes.
-
-  Instead of `MyModule.__behaviour__(:callbacks)`,
-  `MyModule.behaviour_info(:callbacks)` can be used.
-  """
-
-  @moduledoc deprecated: "Use @callback and @macrocallback attributes instead"
-
-  @doc """
-  Defines a function callback according to the given type specification.
-  """
-  @deprecated "Use the @callback module attribute instead"
-  defmacro defcallback(spec) do
-    do_defcallback(:def, split_spec(spec, quote(do: term)))
-  end
-
-  @doc """
-  Defines a macro callback according to the given type specification.
-  """
-  @deprecated "Use the @macrocallback module attribute instead"
-  defmacro defmacrocallback(spec) do
-    do_defcallback(:defmacro, split_spec(spec, quote(do: Macro.t())))
-  end
-
-  defp split_spec({:when, _, [{:"::", _, [spec, return]}, guard]}, _default) do
-    {spec, return, guard}
-  end
-
-  defp split_spec({:when, _, [spec, guard]}, default) do
-    {spec, default, guard}
-  end
-
-  defp split_spec({:"::", _, [spec, return]}, _default) do
-    {spec, return, []}
-  end
-
-  defp split_spec(spec, default) do
-    {spec, default, []}
-  end
-
-  defp do_defcallback(kind, {spec, return, guards}) do
-    case Macro.decompose_call(spec) do
-      {name, args} ->
-        do_callback(kind, name, args, return, guards)
-
-      _ ->
-        raise ArgumentError, "invalid syntax in #{kind}callback #{Macro.to_string(spec)}"
-    end
-  end
-
-  defp do_callback(kind, name, args, return, guards) do
-    fun = fn
-      {:"::", _, [left, right]} ->
-        ensure_not_default(left)
-        ensure_not_default(right)
-        left
-
-      other ->
-        ensure_not_default(other)
-        other
-    end
-
-    :lists.foreach(fun, args)
-
-    spec =
-      quote do
-        unquote(name)(unquote_splicing(args)) :: unquote(return) when unquote(guards)
-      end
-
-    case kind do
-      :def -> quote(do: @callback(unquote(spec)))
-      :defmacro -> quote(do: @macrocallback(unquote(spec)))
-    end
-  end
-
-  defp ensure_not_default({:\\, _, [_, _]}) do
-    raise ArgumentError, "default arguments \\\\ not supported in defcallback/defmacrocallback"
-  end
-
-  defp ensure_not_default(_), do: :ok
-
-  @doc false
-  defmacro __using__(_) do
-    quote do
-      warning =
-        "the Behaviour module is deprecated. Instead of using this module, " <>
-          "use the @callback and @macrocallback module attributes. See the " <>
-          "documentation for Module for more information on these attributes"
-
-      IO.warn(warning)
-
-      @doc false
-      def __behaviour__(:callbacks) do
-        __MODULE__.behaviour_info(:callbacks)
-      end
-
-      def __behaviour__(:docs) do
-        {:docs_v1, _, :elixir, _, _, _, docs} = Code.fetch_docs(__MODULE__)
-
-        for {{kind, name, arity}, line, _, doc, _} <- docs, kind in [:callback, :macrocallback] do
-          case kind do
-            :callback -> {{name, arity}, line, :def, __behaviour__doc_value(doc)}
-            :macrocallback -> {{name, arity}, line, :defmacro, __behaviour__doc_value(doc)}
-          end
-        end
-      end
-
-      defp __behaviour__doc_value(%{"en" => doc}), do: doc
-      defp __behaviour__doc_value(:hidden), do: false
-      defp __behaviour__doc_value(_), do: nil
-
-      import unquote(__MODULE__)
-    end
-  end
-end
@@ -0,0 +1,218 @@
+defmodule Binary do
+  @moduledoc """
+  Functions for working with binaries.
+  """
+
+  @doc %B"""
+  Receives a char list and escapes all special chars (like \n)
+  and interpolation markers. A last argument is given and wraps
+  the whole char list given.
+
+  ## Examples
+
+      Binary.escape "foo", ?'
+      #=> "'foo'"
+
+  """
+  def escape(other, char) do
+    <<char>> <> do_escape(other, char)
+  end
+
+  @doc """
+  Check if a binary is printable considering it is encoded
+  as UTF-8. Returns true if so, false otherwise.
+
+  ## Examples
+
+      Binary.printable?("abc") #=> true
+
+  """
+
+  # Allow basic ascii chars
+  def printable?(<<c, t|:binary>>) when c in ?\s..?~ do
+    printable?(t)
+  end
+
+  # From 16#A0 to 16#BF
+  def printable?(<<194, c, t|:binary>>) when c in 160..191 do
+    printable?(t)
+  end
+
+  # From 16#C0 to 16#7FF
+  def printable?(<<m, o1, t|:binary>>) when m in 195..223 and o1 in 128..191 do
+    printable?(t)
+  end
+
+  # From 16#800 to 16#CFFF
+  def printable?(<<m, o1, o2, t|:binary>>) when m in 224..236 and
+      o1 >= 128 and o1 < 192 and o2 >= 128 and o2 < 192 do
+    printable?(t)
+  end
+
+  # From 16#D000 to 16#D7FF
+  def printable?(<<237, o1, o2, t|:binary>>) when
+      o1 >= 128 and o1 < 160 and o2 >= 128 and o2 < 192 do
+    printable?(t)
+  end
+
+  # Reject 16#FFFF and 16#FFFE
+  def printable?(<<239, 191, o>>) when o == 190 or o == 191 do
+    false
+  end
+
+  # From 16#E000 to 16#EFFF
+  def printable?(<<m, o1, o2, t|:binary>>) when (m == 238 or m == 239) and
+      o1 in 128..191 and o2 in 128..191 do
+    printable?(t)
+  end
+
+  # From 16#F000 to 16#FFFD
+  def printable?(<<239, o1, o2, t|:binary>>) when
+      o1 in 128..191 and o2 in 128..191 do
+    printable?(t)
+  end
+
+  # From 16#10000 to 16#3FFFF
+  def printable?(<<240, o1, o2, o3, t|:binary>>) when
+      o1 in 144..191 and o2 in 128..191 and o3 in 128..191 do
+    printable?(t)
+  end
+
+  # Reject 16#110000 onwards
+  def printable?(<<244, o1, _, _, _|:binary>>) when o1 >= 144 do
+    false
+  end
+
+  # From 16#4000 to 16#10FFFF
+  def printable?(<<m, o1, o2, o3, t|:binary>>) when m in 241..244 and
+      o1 in 128..191 and o2 in 128..191 and o3 in 128..191 do
+    printable?(t)
+  end
+
+  def printable?(<<?\n, t|:binary>>), do: printable?(t)
+  def printable?(<<?\r, t|:binary>>), do: printable?(t)
+  def printable?(<<?\t, t|:binary>>), do: printable?(t)
+  def printable?(<<?\v, t|:binary>>), do: printable?(t)
+  def printable?(<<?\b, t|:binary>>), do: printable?(t)
+  def printable?(<<?\f, t|:binary>>), do: printable?(t)
+  def printable?(<<?\e, t|:binary>>), do: printable?(t)
+
+  def printable?(<<>>), do: true
+  def printable?(_),    do: false
+
+  @doc %B"""
+  Unescape the given chars. The unescaping is driven by the same
+  rules as single- and double-quoted strings. Check `unescape/2`
+  for information on how to customize the escaping map.
+
+  In this setup, Elixir will escape the following: `\b`, `\d`,
+  `\e`, `\f`, `\n`, `\r`, `\s`, `\t` and `\v`. Octals are also
+  escaped according to the latin1 set they represent.
+
+  ## Examples
+
+      Binary.unescape "example\\n"
+      #=> "example\n"
+
+  In the example above, we pass a string with `\n` escaped
+  and we return a version with it unescaped.
+  """
+  def unescape(chars) do
+    Erlang.elixir_interpolation.unescape_chars(chars)
+  end
+
+  @doc %B"""
+  Unescape the given chars according to the map given.
+  Check `unescape/1` if you want to use the same map as Elixir
+  single- and double-quoted strings.
+
+  ## Map
+
+  The map must be a function. The function receives an integer
+  representing the number of the characters it wants to unescape.
+  Here is the default mapping function implemented by Elixir:
+
+      def unescape_map(?b), do: ?\b
+      def unescape_map(?d), do: ?\d
+      def unescape_map(?e), do: ?\e
+      def unescape_map(?f), do: ?\f
+      def unescape_map(?n), do: ?\n
+      def unescape_map(?r), do: ?\r
+      def unescape_map(?s), do: ?\s
+      def unescape_map(?t), do: ?\t
+      def unescape_map(?v), do: ?\v
+      def unescape_map(e), do: e
+
+  If the `unescape_map` function returns false. The char is
+  not escaped and `\` is kept in the char list.
+
+  ## Octals
+
+  Octals will by default be escaped unless the map function
+  returns false for ?0.
+
+  ## Examples
+
+  Using the unescape_map defined above is easy:
+
+      Binary.unescape "example\\n", unescape_map(&1)
+
+  """
+  def unescape(chars, map) do
+    Erlang.elixir_interpolation.unescape_chars(chars, map)
+  end
+
+  @doc """
+  Unescape the given tokens according to the default map.
+  Check `unescape/1` and `unescape/2` for more information
+  about unescaping. Only tokens that are char lists are
+  unescaped, all others are ignored. This method is useful
+  when implementing your own sigils. Check the implementation
+  of `Kernel.__b__` for examples.
+  """
+  def unescape_tokens(tokens) do
+    Erlang.elixir_interpolation.unescape_tokens(tokens)
+  end
+
+  @doc """
+  Unescape the given tokens according to the given map.
+  Check `unescape_tokens/1` and `unescaped/2` for more information.
+  """
+  def unescape_tokens(tokens, map) do
+    Erlang.elixir_interpolation.unescape_tokens(tokens, map)
+  end
+
+  ## Helpers
+
+  defp do_escape(<<char, t|:binary>>, char) do
+    <<?\\, char, do_escape(t, char)|:binary>>
+  end
+
+  defp do_escape(<<h, t|:binary>>, char) when
+    h == ?#  or h == ?\b or
+    h == ?\d or h == ?\e or
+    h == ?\f or h == ?\n or
+    h == ?\r or h == ?\\ or
+    h == ?\t or h == ?\v do
+    <<?\\, escape_map(h), do_escape(t, char)|:binary>>
+  end
+
+  defp do_escape(<<h, t|:binary>>, char) do
+    <<h, do_escape(t,char)|:binary>>
+  end
+
+  defp do_escape(<<>>, char) do
+    <<char>>
+  end
+
+  defp escape_map(?#),  do: ?#
+  defp escape_map(?\b), do: ?b
+  defp escape_map(?\d), do: ?d
+  defp escape_map(?\e), do: ?e
+  defp escape_map(?\f), do: ?f
+  defp escape_map(?\n), do: ?n
+  defp escape_map(?\r), do: ?r
+  defp escape_map(?\\), do: ?\\
+  defp escape_map(?\t), do: ?t
+  defp escape_map(?\v), do: ?v
+end
@@ -0,0 +1,74 @@
+import Kernel, except: [to_binary: 1]
+
+defprotocol Binary.Chars do
+  @moduledoc %B"""
+  The Binary.Chars protocol is responsible for
+  converting a structure to a Binary (only if applicable).
+  The only function required to be implemented is
+  `to_binary` which does the conversion.
+
+  The `to_binary` function automatically imported
+  by Kernel invokes this protocol. String
+  interpolation also invokes to_binary in its
+  arguments. For example, `"foo#{bar}"` is the same
+  as `"foo" <> to_binary(bar)`.
+  """
+
+  @only [BitString, List, Number, Atom, Record]
+
+  def to_binary(thing)
+end
+
+defimpl Binary.Chars, for: Atom do
+  @doc """
+  Convert the atom literally to a binary, except
+  `nil` which is converted to an empty string.
+  """
+  def to_binary(nil) do
+    ""
+  end
+
+  def to_binary(atom) do
+    atom_to_binary(atom, :utf8)
+  end
+end
+
+defimpl Binary.Chars, for: BitString do
+  @doc """
+  Simply returns the binary itself.
+  """
+  def to_binary(thing) when is_binary(thing) do
+    thing
+  end
+end
+
+defimpl Binary.Chars, for: List do
+  @doc """
+  Consider the list is an iolist and converts it
+  to a binary. This allows a list of binaries, or
+  a charlist, or a mix of both, to be converted
+  successfully.
+
+  ## Examples
+
+      to_binary 'foo' #=> "foo"
+      to_binary ["foo", 'bar'] #=> "foobar"
+
+  """
+  def to_binary(thing) do
+    iolist_to_binary(thing)
+  end
+end
+
+defimpl Binary.Chars, for: Number do
+  @doc """
+  Simply converts the number (integer or a float) to a binary.
+  """
+  def to_binary(thing) when is_integer(thing) do
+    list_to_binary integer_to_list(thing)
+  end
+
+  def to_binary(thing) do
+    list_to_binary float_to_list(thing)
+  end
+end
@@ -0,0 +1,301 @@
+import Kernel, except: [inspect: 1]
+
+defprotocol Binary.Inspect do
+  @moduledoc """
+  The `Binary.Inspect` protocol is responsible for
+  converting any structure to a Binary for textual
+  representation. All basic data structures (tuple,
+  list, function, pid, etc) implement the inspect
+  protocol. Other structures are adviced to implement
+  the protocol in order to provide pretty printing.
+  """
+
+  @only [BitString, List, Record, Tuple, Atom, Number, Any]
+
+  def inspect(thing)
+end
+
+defimpl Binary.Inspect, for: Atom do
+  require Macro
+
+  @doc """
+  Represents the atom as an Elixir term. The atoms false, true
+  and nil are simply quoted. Modules are properly represented
+  as modules using the dot notation.
+
+  Notice that in Elixir, all operators can be represented using
+  literal atoms (`:+`, `:-`, etc).
+
+  ## Examples
+
+      inspect(:foo)    #=> ":foo"
+      inspect(nil)     #=> "nil"
+      inspect(Foo.Bar) #=> "Foo.Bar"
+
+  """
+  def inspect(false),  do: "false"
+  def inspect(true),   do: "true"
+  def inspect(nil),    do: "nil"
+  def inspect(:""),    do: ":\"\""
+  def inspect(Elixir), do: "Elixir"
+
+  def inspect(atom) do
+    binary = atom_to_binary(atom)
+
+    cond do
+      valid_atom_identifier?(binary) ->
+        ":" <> binary
+      valid_ref_identifier?(binary) ->
+        "Elixir-" <> rest = binary
+        bc <<r>> inbits rest, do: <<to_dot(r)>>
+      atom in Macro.binary_ops or atom in Macro.unary_ops ->
+        ":" <> binary
+      true ->
+        ":" <> Binary.escape(binary, ?")
+    end
+  end
+
+  # Detect if atom is an atom alias (Elixir-Foo-Bar-Baz)
+
+  defp to_dot(?-), do: ?.
+  defp to_dot(l),  do: l
+
+  defp valid_ref_identifier?("Elixir" <> rest) do
+    valid_ref_piece?(rest)
+  end
+
+  defp valid_ref_identifier?(_), do: false
+
+  defp valid_ref_piece?(<<?-, h, t|:binary>>) when h in ?A..?Z do
+    valid_ref_piece? valid_identifier?(t)
+  end
+
+  defp valid_ref_piece?(<<>>), do: true
+  defp valid_ref_piece?(_),    do: false
+
+  # Detect if atom
+
+  defp valid_atom_identifier?(<<h, t|:binary>>) when h in ?a..?z or h in ?A..?Z or h == ?_ do
+    case valid_identifier?(t) do
+      <<>>   -> true
+      <<??>> -> true
+      <<?!>> -> true
+      _      -> false
+    end
+  end
+
+  defp valid_atom_identifier?(_), do: false
+
+  defp valid_identifier?(<<h, t|:binary>>)
+      when h in ?a..?z
+      when h in ?A..?Z
+      when h in ?0..?9
+      when h == ?_ do
+    valid_identifier? t
+  end
+
+  defp valid_identifier?(other), do: other
+end
+
+defimpl Binary.Inspect, for: BitString do
+  @doc %B"""
+  Represents the string as itself escaping
+  all necessary characters.
+
+  ## Examples
+
+      inspect("bar")   #=> "bar"
+      inspect("f\"oo") #=> "f\"oo"
+
+  """
+  def inspect(thing) when is_binary(thing) do
+    if Binary.printable?(thing) do
+      Binary.escape(thing, ?")
+    else
+      as_bitstring(thing)
+    end
+  end
+
+  def inspect(thing) do
+    as_bitstring(thing)
+  end
+
+  ## Helpers
+
+  defp as_bitstring(thing) do
+    erlang = Erlang.io_lib.format('~p', [thing])
+    list_to_binary List.reverse(replace(erlang, []))
+  end
+
+  defp replace([?:|t], acc),                do: replace(t, [?||acc])
+  defp replace([h|t], acc) when is_list(h), do: replace(t, replace(h, acc))
+  defp replace([h|t], acc),                 do: replace(t, [h|acc])
+  defp replace([], acc),                    do: acc
+end
+
+defimpl Binary.Inspect, for: List do
+
+  @doc %B"""
+  Represents a list checking if it can be printed or not.
+  If so, a single-quoted representation is returned,
+  otherwise the brackets syntax is used.
+
+  Inspecting a list is conservative as it does not try
+  to guess how the list is encoded. That said, `'josé'`
+  will likely be inspected as `[106,111,115,195,169]`
+  because we can't know if it is encoded in utf-8
+  or iso-5569-1, which is common in Erlang libraries.
+
+  ## Examples
+
+      inspect('bar')       #=> 'bar'
+      inspect([0|'bar'])   #=> "[0,98,97,114]"
+      inspect([:foo,:bar]) #=> "[:foo, :bar]"
+
+  """
+
+  def inspect([]), do: "[]"
+
+  def inspect(thing) do
+    if printable?(thing) do
+      Binary.escape(list_to_binary(thing), ?')
+    else
+      container_join(thing, "[", "]")
+    end
+  end
+
+  ## Helpers
+
+  def container_join([h], acc, last) do
+    acc <> Binary.Inspect.inspect(h) <> last
+  end
+
+  def container_join([h|t], acc, last) when is_list(t) do
+    acc = acc <> Binary.Inspect.inspect(h) <> ","
+    container_join(t, acc, last)
+  end
+
+  def container_join([h|t], acc, last) do
+    acc <> Binary.Inspect.inspect(h) <> "|" <> Binary.Inspect.inspect(t) <> last
+  end
+
+  def container_join([], acc, last) do
+    acc <> last
+  end
+
+  ## printable?
+
+  defp printable?([c|cs]) when is_integer(c) and c in 32..126 do
+    printable?(cs)
+  end
+
+  defp printable?([c|cs]) when c in [?\n, ?\r, ?\t, ?\v, ?\b, ?\f, ?\e] do
+    printable?(cs)
+  end
+
+  defp printable?([]), do: true
+  defp printable?(_),  do: false
+end
+
+defimpl Binary.Inspect, for: Tuple do
+  @doc """
+  Inspect tuples. If the tuple represents a record,
+  it shows it nicely formatted using the access syntax.
+
+  ## Examples
+
+      inspect({1,2,3})            #=> "{1,2,3}"
+      inspect(ArgumentError.new)  #=> ArgumentError[message: "argument error"]
+
+  """
+  def inspect({}), do: "{}"
+
+  def inspect(exception) when is_exception(exception) do
+    [name,_|tail] = tuple_to_list(exception)
+    [_|fields]    = lc { field, _ } inlist name.__record__(:fields), do: field
+    Binary.Inspect.Atom.inspect(name) <> records_join(fields, tail, "[", "]")
+  end
+
+  def inspect(thing) do
+    list = tuple_to_list(thing)
+    [name|tail] = list
+
+    if is_record?(name) do
+      fields = lc { field, _ } inlist name.__record__(:fields), do: field
+      if length(fields) != size(thing) - 1 do
+        Binary.Inspect.List.container_join(list, "{", "}")
+      else
+        Binary.Inspect.Atom.inspect(name) <> records_join(fields, tail, "[", "]")
+      end
+    else
+      Binary.Inspect.List.container_join(list, "{", "}")
+    end
+  end
+
+  ## Helpers
+
+  defp is_record?(name) do
+    is_atom(name) and match?("Elixir-" <> _, atom_to_binary(name, :utf8)) and
+      function_exported?(name, :__record__, 1)
+  end
+
+  defp records_join([f], [v], acc, last) do
+    acc <> atom_to_binary(f, :utf8) <> ": " <> Binary.Inspect.inspect(v) <> last
+  end
+
+  defp records_join([fh|ft], [vh|vt], acc, last) do
+    acc = acc <> atom_to_binary(fh, :utf8) <> ": " <> Binary.Inspect.inspect(vh) <> ", "
+    records_join(ft, vt, acc, last)
+  end
+
+  defp records_join([], [], acc, last) do
+    acc <> last
+  end
+end
+
+defimpl Binary.Inspect, for: Number do
+  @doc """
+  Represents the number as a binary.
+
+  ## Examples
+
+      inspect(1) #=> "1"
+
+  """
+  def inspect(thing) when is_integer(thing) do
+    list_to_binary integer_to_list(thing)
+  end
+
+  def inspect(thing) do
+    list_to_binary float_to_list(thing)
+  end
+end
+
+defimpl Binary.Inspect, for: Regex do
+  @doc %B"""
+  Represents the Regex using the `%r""` syntax.
+
+  ## Examples
+
+      inspect(%r/foo/m) #=> "%r\"foo\"m"
+
+  """
+  def inspect(thing) do
+    "%r" <> Binary.Inspect.inspect(Regex.source(thing)) <> Regex.opts(thing)
+  end
+end
+
+defimpl Binary.Inspect, for: Any do
+  @doc """
+  For all other terms not implemented, we use the default
+  Erlang representation.
+
+  ## Examples
+
+      inspect Process.self #=> "<0.35.0>"
+
+  """
+  def inspect(thing) do
+    iolist_to_binary Erlang.io_lib.format('~p', [thing])
+  end
+end
@@ -1,59 +1,39 @@
 defmodule Bitwise do
  @moduledoc """
-  A set of functions that perform calculations on bits.
+  This module provide macros and operators for bitwise operators.
+  These macros can be used in guards.

-  All bitwise functions work only on integers; otherwise an
-  `ArithmeticError` is raised.
+  The easiest way to use is to simply import them into
+  your module:

-  The functions in this module come in two flavors: named or
-  operators. For example:
+      use Bitwise

-      iex> use Bitwise
-      iex> bnot(1) # named
-      -2
-      iex> 1 &&& 1 # operator
-      1
+      bnot 1   #=> -2
+      1 &&& 1  #=> 1

-  If you prefer to use only operators or skip them, you can
-  pass the following options:
+  You can select to include only or skip operators by passing options:

-    * `:only_operators` - includes only operators
-    * `:skip_operators` - skips operators
+      use Bitwise, only_operators: true
+      1 &&& 1 #=> 1

-  For example:
-
-      iex> use Bitwise, only_operators: true
-      iex> 1 &&& 1
-      1
-
-  When invoked with no options, `use Bitwise` is equivalent
-  to `import Bitwise`.
-
-  All bitwise functions can be used in guards:
-
-      iex> odd? = fn
-      ...>   int when Bitwise.band(int, 1) == 1 -> true
-      ...>   _ -> false
-      ...> end
-      iex> odd?.(1)
-      true
-
-  All functions in this module are inlined by the compiler.
  """

-  @doc false
+  @doc """
+  Allow a developer to use this module in their programs with
+  the following options:
+
+  * `:only_operators` - Include only operators;
+  * `:skip_operators` - Skip operators;
+
+  """
  defmacro __using__(options) do
-    except =
-      cond do
-        Keyword.get(options, :only_operators) ->
-          [bnot: 1, band: 2, bor: 2, bxor: 2, bsl: 2, bsr: 2]
-
-        Keyword.get(options, :skip_operators) ->
-          [~~~: 1, &&&: 2, |||: 2, ^^^: 2, <<<: 2, >>>: 2]
-
-        true ->
-          []
-      end
+    except = cond do
+      Keyword.get(options, :only_operators) ->
+        [:bnot, :band, :bor, :bxor, :bsl, :bsr]
+      Keyword.get(options, :skip_operators) ->
+        [:~~~, :&&&, :|||, :^^^, :<<<, :>>>]
+      true -> []
+    end

    quote do
      import Bitwise, except: unquote(except)
@@ -61,246 +41,86 @@ defmodule Bitwise do
  end

  @doc """
-  Calculates the bitwise NOT of the argument.
-
-  Allowed in guard tests. Inlined by the compiler.
-
-  ## Examples
-
-      iex> bnot(2)
-      -3
-
-      iex> bnot(2) &&& 3
-      1
-
+  Bitwise not.
  """
-  @doc guard: true
-  @spec bnot(integer) :: integer
-  def bnot(expr) do
-    :erlang.bnot(expr)
+  defmacro bnot(expr) do
+    quote do: __op__ :bnot, unquote(expr)
  end

  @doc """
-  Bitwise NOT unary operator.
-
-  Calculates the bitwise NOT of the argument.
-
-  Allowed in guard tests. Inlined by the compiler.
-
-  ## Examples
-
-      iex> ~~~2
-      -3
-
-      iex> ~~~2 &&& 3
-      1
-
+  Bitwise not as operator.
  """
-  @doc guard: true
-  @spec ~~~integer :: integer
-  def ~~~expr do
-    :erlang.bnot(expr)
+  defmacro ~~~expr do
+    quote do: __op__ :bnot, unquote(expr)
  end

  @doc """
-  Calculates the bitwise AND of its arguments.
-
-  Allowed in guard tests. Inlined by the compiler.
-
-  ## Examples
-
-      iex> band(9, 3)
-      1
-
+  Bitwise and.
  """
-  @doc guard: true
-  @spec band(integer, integer) :: integer
-  def band(left, right) do
-    :erlang.band(left, right)
+  defmacro band(left, right) do
+    quote do: __op__ :band, unquote(left), unquote(right)
  end

  @doc """
-  Bitwise AND operator.
-
-  Calculates the bitwise AND of its arguments.
-
-  Allowed in guard tests. Inlined by the compiler.
-
-  ## Examples
-
-      iex> 9 &&& 3
-      1
-
+  Bitwise and as operator.
  """
-  @doc guard: true
-  @spec integer &&& integer :: integer
-  def left &&& right do
-    :erlang.band(left, right)
+  defmacro left &&& right do
+    quote do: __op__ :band, unquote(left), unquote(right)
  end

  @doc """
-  Calculates the bitwise OR of its arguments.
-
-  Allowed in guard tests. Inlined by the compiler.
-
-  ## Examples
-
-      iex> bor(9, 3)
-      11
-
+  Bitwise or.
  """
-  @doc guard: true
-  @spec bor(integer, integer) :: integer
-  def bor(left, right) do
-    :erlang.bor(left, right)
+  defmacro bor(left, right) do
+    quote do: __op__ :bor, unquote(left), unquote(right)
  end

  @doc """
-  Bitwise OR operator.
-
-  Calculates the bitwise OR of its arguments.
-
-  Allowed in guard tests. Inlined by the compiler.
-
-  ## Examples
-
-      iex> 9 ||| 3
-      11
-
+  Bitwise or as operator.
  """
-  @doc guard: true
-  @spec integer ||| integer :: integer
-  def left ||| right do
-    :erlang.bor(left, right)
+  defmacro left ||| right do
+    quote do: __op__ :bor, unquote(left), unquote(right)
  end

  @doc """
-  Calculates the bitwise XOR of its arguments.
-
-  Allowed in guard tests. Inlined by the compiler.
-
-  ## Examples
-
-      iex> bxor(9, 3)
-      10
-
+  Bitwise xor.
  """
-  @doc guard: true
-  @spec bxor(integer, integer) :: integer
-  def bxor(left, right) do
-    :erlang.bxor(left, right)
-  end
-
-  @doc false
-  def unquote(:^^^)(left, right) do
-    :erlang.bxor(left, right)
+  defmacro bxor(left, right) do
+    quote do: __op__ :bxor, unquote(left), unquote(right)
  end

  @doc """
-  Calculates the result of an arithmetic left bitshift.
-
-  Allowed in guard tests. Inlined by the compiler.
-
-  ## Examples
-
-      iex> bsl(1, 2)
-      4
-
-      iex> bsl(1, -2)
-      0
-
-      iex> bsl(-1, 2)
-      -4
-
-      iex> bsl(-1, -2)
-      -1
-
+  Bitwise xor as operator.
  """
-  @doc guard: true
-  @spec bsl(integer, integer) :: integer
-  def bsl(left, right) do
-    :erlang.bsl(left, right)
+  defmacro left ^^^ right do
+    quote do: __op__ :bxor, unquote(left), unquote(right)
  end

  @doc """
-  Arithmetic left bitshift operator.
-
-  Calculates the result of an arithmetic left bitshift.
-
-  Allowed in guard tests. Inlined by the compiler.
-
-  ## Examples
-
-      iex> 1 <<< 2
-      4
-
-      iex> 1 <<< -2
-      0
-
-      iex> -1 <<< 2
-      -4
-
-      iex> -1 <<< -2
-      -1
-
+  Arithmetic bitshift left.
  """
-  @doc guard: true
-  @spec integer <<< integer :: integer
-  def left <<< right do
-    :erlang.bsl(left, right)
+  defmacro bsl(left, right) do
+    quote do: __op__ :bsl, unquote(left), unquote(right)
  end

  @doc """
-  Calculates the result of an arithmetic right bitshift.
-
-  Allowed in guard tests. Inlined by the compiler.
-
-  ## Examples
-
-      iex> bsr(1, 2)
-      0
-
-      iex> bsr(1, -2)
-      4
-
-      iex> bsr(-1, 2)
-      -1
-
-      iex> bsr(-1, -2)
-      -4
-
+  Arithmetic bitshift left as operator.
  """
-  @doc guard: true
-  @spec bsr(integer, integer) :: integer
-  def bsr(left, right) do
-    :erlang.bsr(left, right)
+  defmacro left <<< right do
+    quote do: __op__ :bsl, unquote(left), unquote(right)
  end

  @doc """
-  Arithmetic right bitshift operator.
-
-  Calculates the result of an arithmetic right bitshift.
-
-  Allowed in guard tests. Inlined by the compiler.
-
-  ## Examples
-
-      iex> 1 >>> 2
-      0
-
-      iex> 1 >>> -2
-      4
-
-      iex> -1 >>> 2
-      -1
-
-      iex> -1 >>> -2
-      -4
-
+  Arithmetic bitshift right.
  """
-  @doc guard: true
-  @spec integer >>> integer :: integer
-  def left >>> right do
-    :erlang.bsr(left, right)
+  defmacro bsr(left, right) do
+    quote do: __op__ :bsr, unquote(left), unquote(right)
  end
-end
+
+  @doc """
+  Arithmetic bitshift right as operator.
+  """
+  defmacro left >>> right do
+    quote do: __op__ :bsr, unquote(left), unquote(right)
+  end
+end
@@ -1,886 +0,0 @@
-defmodule Calendar do
-  @moduledoc """
-  This module defines the responsibilities for working with
-  calendars, dates, times and datetimes in Elixir.
-
-  Currently it defines types and the minimal implementation
-  for a calendar behaviour in Elixir. The goal of the Calendar
-  features in Elixir is to provide a base for interoperability
-  instead of full-featured datetime API.
-
-  For the actual date, time and datetime structures, see `Date`,
-  `Time`, `NaiveDateTime` and `DateTime`.
-
-  Note designations for year, month, day, and the like, are overspecified
-  (i.e. an integer instead of `1..12` for months) because different
-  calendars may have a different number of days per month, months per year and so on.
-  """
-
-  @type year :: integer
-  @type month :: pos_integer
-  @type day :: pos_integer
-  @type week :: pos_integer
-  @type day_of_week :: non_neg_integer
-  @type era :: non_neg_integer
-
-  @typedoc """
-  A tuple representing the `day` and the `era`.
-  """
-  @type day_of_era :: {day :: non_neg_integer(), era}
-
-  @type hour :: non_neg_integer
-  @type minute :: non_neg_integer
-  @type second :: non_neg_integer
-
-  @typedoc """
-  The internal time format is used when converting between calendars.
-
-  It represents time as a fraction of a day (starting from midnight).
-  `parts_in_day` specifies how much of the day is already passed,
-  while `parts_per_day` signifies how many parts there fit in a day.
-  """
-  @type day_fraction :: {parts_in_day :: non_neg_integer, parts_per_day :: pos_integer}
-
-  @typedoc """
-  The internal date format that is used when converting between calendars.
-
-  This is the number of days including the fractional part that has passed of
-  the last day since 0000-01-01+00:00T00:00.000000 in ISO 8601 notation (also
-  known as midnight 1 January BC 1 of the proleptic Gregorian calendar).
-  """
-  @type iso_days :: {days :: integer, day_fraction}
-
-  @typedoc """
-  Microseconds with stored precision.
-
-  The precision represents the number of digits that must be used when
-  representing the microseconds to external format. If the precision is 0,
-  it means microseconds must be skipped.
-  """
-  @type microsecond :: {non_neg_integer, non_neg_integer}
-
-  @typedoc "A calendar implementation"
-  @type calendar :: module
-
-  @typedoc "The time zone ID according to the IANA tz database (for example, Europe/Zurich)"
-  @type time_zone :: String.t()
-
-  @typedoc "The time zone abbreviation (for example, CET or CEST or BST, and such)"
-  @type zone_abbr :: String.t()
-
-  @typedoc """
-  The time zone UTC offset in seconds for standard time.
-
-  See also `t:std_offset/0`.
-  """
-  @type utc_offset :: integer
-
-  @typedoc """
-  The time zone standard offset in seconds (typically not zero in summer times).
-
-  It must be added to `t:utc_offset/0` to get the total offset from UTC used for "wall time".
-  """
-  @type std_offset :: integer
-
-  @typedoc "Any map/struct that contains the date fields"
-  @type date :: %{optional(any) => any, calendar: calendar, year: year, month: month, day: day}
-
-  @typedoc "Any map/struct that contains the time fields"
-  @type time :: %{
-          optional(any) => any,
-          hour: hour,
-          minute: minute,
-          second: second,
-          microsecond: microsecond
-        }
-
-  @typedoc "Any map/struct that contains the naive_datetime fields"
-  @type naive_datetime :: %{
-          optional(any) => any,
-          calendar: calendar,
-          year: year,
-          month: month,
-          day: day,
-          hour: hour,
-          minute: minute,
-          second: second,
-          microsecond: microsecond
-        }
-
-  @typedoc "Any map/struct that contains the datetime fields"
-  @type datetime :: %{
-          optional(any) => any,
-          calendar: calendar,
-          year: year,
-          month: month,
-          day: day,
-          hour: hour,
-          minute: minute,
-          second: second,
-          microsecond: microsecond,
-          time_zone: time_zone,
-          zone_abbr: zone_abbr,
-          utc_offset: utc_offset,
-          std_offset: std_offset
-        }
-
-  @typedoc """
-  Specifies the time zone database for calendar operations.
-
-  Many functions in the `DateTime` module require a time zone database.
-  By default, it uses the default time zone database returned by
-  `Calendar.get_time_zone_database/0`, which defaults to
-  `Calendar.UTCOnlyTimeZoneDatabase` which only handles "Etc/UTC"
-  datetimes and returns `{:error, :utc_only_time_zone_database}`
-  for any other time zone.
-
-  Other time zone databases (including ones provided by packages)
-  can be configured as default either via configuration:
-
-      config :elixir, :time_zone_database, CustomTimeZoneDatabase
-
-  or by calling `Calendar.put_time_zone_database/1`.
-
-  See `Calendar.TimeZoneDatabase` for more information on custom
-  time zone databases.
-  """
-  @type time_zone_database :: module()
-
-  @doc """
-  Returns how many days there are in the given year-month.
-  """
-  @callback days_in_month(year, month) :: day
-
-  @doc """
-  Returns how many months there are in the given year.
-  """
-  @callback months_in_year(year) :: month
-
-  @doc """
-  Returns `true` if the given year is a leap year.
-
-  A leap year is a year of a longer length than normal. The exact meaning
-  is up to the calendar. A calendar must return `false` if it does not support
-  the concept of leap years.
-  """
-  @callback leap_year?(year) :: boolean
-
-  @doc """
-  Calculates the day of the week from the given `year`, `month`, and `day`.
-
-  The `starting_on` represents the starting day of the week. All
-  calendars must support at least the `:default` value. They may
-  also support other values representing their days of the week.
-  """
-  @callback day_of_week(year, month, day, starting_on :: :default | atom) ::
-              {day_of_week(), first_day_of_week :: non_neg_integer(),
-               last_day_of_week :: non_neg_integer()}
-
-  @doc """
-  Calculates the day of the year from the given `year`, `month`, and `day`.
-  """
-  @callback day_of_year(year, month, day) :: non_neg_integer()
-
-  @doc """
-  Calculates the quarter of the year from the given `year`, `month`, and `day`.
-  """
-  @callback quarter_of_year(year, month, day) :: non_neg_integer()
-
-  @doc """
-  Calculates the year and era from the given `year`.
-  """
-  @callback year_of_era(year, month, day) :: {year, era}
-
-  @doc """
-  Calculates the day and era from the given `year`, `month`, and `day`.
-  """
-  @callback day_of_era(year, month, day) :: day_of_era()
-
-  @doc """
-  Converts the date into a string according to the calendar.
-  """
-  @callback date_to_string(year, month, day) :: String.t()
-
-  @doc """
-  Converts the datetime (without time zone) into a string according to the calendar.
-  """
-  @callback naive_datetime_to_string(year, month, day, hour, minute, second, microsecond) ::
-              String.t()
-
-  @doc """
-  Converts the datetime (with time zone) into a string according to the calendar.
-  """
-  @callback datetime_to_string(
-              year,
-              month,
-              day,
-              hour,
-              minute,
-              second,
-              microsecond,
-              time_zone,
-              zone_abbr,
-              utc_offset,
-              std_offset
-            ) :: String.t()
-
-  @doc """
-  Converts the time into a string according to the calendar.
-  """
-  @callback time_to_string(hour, minute, second, microsecond) :: String.t()
-
-  @doc """
-  Converts the given datetime (without time zone) into the `t:iso_days/0` format.
-  """
-  @callback naive_datetime_to_iso_days(year, month, day, hour, minute, second, microsecond) ::
-              iso_days
-
-  @doc """
-  Converts `t:iso_days/0` to the Calendar's datetime format.
-  """
-  @callback naive_datetime_from_iso_days(iso_days) ::
-              {year, month, day, hour, minute, second, microsecond}
-
-  @doc """
-  Converts the given time to the `t:day_fraction/0` format.
-  """
-  @callback time_to_day_fraction(hour, minute, second, microsecond) :: day_fraction
-
-  @doc """
-  Converts `t:day_fraction/0` to the Calendar's time format.
-  """
-  @callback time_from_day_fraction(day_fraction) :: {hour, minute, second, microsecond}
-
-  @doc """
-  Define the rollover moment for the given calendar.
-
-  This is the moment, in your calendar, when the current day ends
-  and the next day starts.
-
-  The result of this function is used to check if two calendars rollover at
-  the same time of day. If they do not, we can only convert datetimes and times
-  between them. If they do, this means that we can also convert dates as well
-  as naive datetimes between them.
-
-  This day fraction should be in its most simplified form possible, to make comparisons fast.
-
-  ## Examples
-
-    * If, in your Calendar, a new day starts at midnight, return {0, 1}.
-    * If, in your Calendar, a new day starts at sunrise, return {1, 4}.
-    * If, in your Calendar, a new day starts at noon, return {1, 2}.
-    * If, in your Calendar, a new day starts at sunset, return {3, 4}.
-
-  """
-  @callback day_rollover_relative_to_midnight_utc() :: day_fraction
-
-  @doc """
-  Should return `true` if the given date describes a proper date in the calendar.
-  """
-  @callback valid_date?(year, month, day) :: boolean
-
-  @doc """
-  Should return `true` if the given time describes a proper time in the calendar.
-  """
-  @callback valid_time?(hour, minute, second, microsecond) :: boolean
-
-  @doc """
-  Parses the string representation for a time returned by `c:time_to_string/4`
-  into a time-tuple.
-  """
-  @doc since: "1.10.0"
-  @callback parse_time(String.t()) ::
-              {:ok, {hour, minute, second, microsecond}}
-              | {:error, atom}
-
-  @doc """
-  Parses the string representation for a date returned by `c:date_to_string/3`
-  into a date-tuple.
-  """
-  @doc since: "1.10.0"
-  @callback parse_date(String.t()) ::
-              {:ok, {year, month, day}}
-              | {:error, atom}
-
-  @doc """
-  Parses the string representation for a naive datetime returned by
-  `c:naive_datetime_to_string/7` into a naive-datetime-tuple.
-
-  The given string may contain a timezone offset but it is ignored.
-  """
-  @doc since: "1.10.0"
-  @callback parse_naive_datetime(String.t()) ::
-              {:ok, {year, month, day, hour, minute, second, microsecond}}
-              | {:error, atom}
-
-  @doc """
-  Parses the string representation for a datetime returned by
-  `c:datetime_to_string/11` into a datetime-tuple.
-
-  The returned datetime must be in UTC. The original `utc_offset`
-  it was written in must be returned in the result.
-  """
-  @doc since: "1.10.0"
-  @callback parse_utc_datetime(String.t()) ::
-              {:ok, {year, month, day, hour, minute, second, microsecond}, utc_offset}
-              | {:error, atom}
-
-  # General Helpers
-
-  @doc """
-  Returns `true` if two calendars have the same moment of starting a new day,
-  `false` otherwise.
-
-  If two calendars are not compatible, we can only convert datetimes and times
-  between them. If they are compatible, this means that we can also convert
-  dates as well as naive datetimes between them.
-  """
-  @doc since: "1.5.0"
-  @spec compatible_calendars?(Calendar.calendar(), Calendar.calendar()) :: boolean
-  def compatible_calendars?(calendar, calendar), do: true
-
-  def compatible_calendars?(calendar1, calendar2) do
-    calendar1.day_rollover_relative_to_midnight_utc() ==
-      calendar2.day_rollover_relative_to_midnight_utc()
-  end
-
-  @doc """
-  Returns a microsecond tuple truncated to a given precision (`:microsecond`,
-  `:millisecond` or `:second`).
-  """
-  @doc since: "1.6.0"
-  @spec truncate(Calendar.microsecond(), :microsecond | :millisecond | :second) ::
-          Calendar.microsecond()
-  def truncate(microsecond_tuple, :microsecond), do: microsecond_tuple
-
-  def truncate({microsecond, precision}, :millisecond) do
-    output_precision = min(precision, 3)
-    {div(microsecond, 1000) * 1000, output_precision}
-  end
-
-  def truncate(_, :second), do: {0, 0}
-
-  @doc """
-  Sets the current time zone database.
-  """
-  @doc since: "1.8.0"
-  @spec put_time_zone_database(time_zone_database()) :: :ok
-  def put_time_zone_database(database) do
-    Application.put_env(:elixir, :time_zone_database, database)
-  end
-
-  @doc """
-  Gets the current time zone database.
-  """
-  @doc since: "1.8.0"
-  @spec get_time_zone_database() :: time_zone_database()
-  def get_time_zone_database() do
-    Application.get_env(:elixir, :time_zone_database, Calendar.UTCOnlyTimeZoneDatabase)
-  end
-
-  @doc """
-  Formats received datetime into a string.
-
-  The datetime can be any of the Calendar types (`Time`, `Date`,
-  `NaiveDateTime`, and `DateTime`) or any map, as long as they
-  contain all of the relevant fields necessary for formatting.
-  For example, if you use `%Y` to format the year, the datetime
-  must have the `:year` field. Therefore, if you pass a `Time`,
-  or a map without the `:year` field to a format that expects `%Y`,
-  an error will be raised.
-
-  ## Options
-
-    * `:preferred_datetime` - a string for the preferred format to show datetimes,
-      it can't contain the `%c` format and defaults to `"%Y-%m-%d %H:%M:%S"`
-      if the option is not received
-
-    * `:preferred_date` - a string for the preferred format to show dates,
-      it can't contain the `%x` format and defaults to `"%Y-%m-%d"`
-      if the option is not received
-
-    * `:preferred_time` - a string for the preferred format to show times,
-      it can't contain the `%X` format and defaults to `"%H:%M:%S"`
-      if the option is not received
-
-    * `:am_pm_names` - a function that receives either `:am` or `:pm` and returns
-      the name of the period of the day, if the option is not received it defaults
-      to a function that returns `"am"` and `"pm"`, respectively
-
-    *  `:month_names` - a function that receives a number and returns the name of
-      the corresponding month, if the option is not received it defaults to a
-      function that returns the month names in English
-
-    * `:abbreviated_month_names` - a function that receives a number and returns the
-      abbreviated name of the corresponding month, if the option is not received it
-      defaults to a function that returns the abbreviated month names in English
-
-    * `:day_of_week_names` - a function that receives a number and returns the name of
-      the corresponding day of week, if the option is not received it defaults to a
-      function that returns the day of week names in English
-
-    * `:abbreviated_day_of_week_names` - a function that receives a number and returns
-      the abbreviated name of the corresponding day of week, if the option is not received
-      it defaults to a function that returns the abbreviated day of week names in English
-
-  ## Formatting syntax
-
-  The formatting syntax for strftime is a sequence of characters in the following format:
-
-      %<padding><width><format>
-
-  where:
-
-    * `%`: indicates the start of a formatted section
-    * `<padding>`: set the padding (see below)
-    * `<width>`: a number indicating the minimum size of the formatted section
-    * `<format>`: the format itself (see below)
-
-  ### Accepted padding options
-
-    * `-`: no padding, removes all padding from the format
-    * `_`: pad with spaces
-    * `0`: pad with zeroes
-
-  ### Accepted formats
-
-  The accepted formats are:
-
-  Format | Description                                                             | Examples (in ISO)
-  :----- | :-----------------------------------------------------------------------| :------------------------
-  a      | Abbreviated name of day                                                 | Mon
-  A      | Full name of day                                                        | Monday
-  b      | Abbreviated month name                                                  | Jan
-  B      | Full month name                                                         | January
-  c      | Preferred date+time representation                                      | 2018-10-17 12:34:56
-  d      | Day of the month                                                        | 01, 31
-  f      | Microseconds *(does not support width and padding modifiers)*           | 000000, 999999, 0123
-  H      | Hour using a 24-hour clock                                              | 00, 23
-  I      | Hour using a 12-hour clock                                              | 01, 12
-  j      | Day of the year                                                         | 001, 366
-  m      | Month                                                                   | 01, 12
-  M      | Minute                                                                  | 00, 59
-  p      | "AM" or "PM" (noon is "PM", midnight as "AM")                           | AM, PM
-  P      | "am" or "pm" (noon is "pm", midnight as "am")                           | am, pm
-  q      | Quarter                                                                 | 1, 2, 3, 4
-  S      | Second                                                                  | 00, 59, 60
-  u      | Day of the week                                                         | 1 (Monday), 7 (Sunday)
-  x      | Preferred date (without time) representation                            | 2018-10-17
-  X      | Preferred time (without date) representation                            | 12:34:56
-  y      | Year as 2-digits                                                        | 01, 01, 86, 18
-  Y      | Year                                                                    | -0001, 0001, 1986
-  z      | +hhmm/-hhmm time zone offset from UTC (empty string if naive)           | +0300, -0530
-  Z      | Time zone abbreviation (empty string if naive)                          | CET, BRST
-  %      | Literal "%" character                                                   | %
-
-  Any other character will be interpreted as an invalid format and raise an error
-
-  ## Examples
-
-  Without options:
-
-      iex> Calendar.strftime(~U[2019-08-26 13:52:06.0Z], "%y-%m-%d %I:%M:%S %p")
-      "19-08-26 01:52:06 PM"
-
-      iex> Calendar.strftime(~U[2019-08-26 13:52:06.0Z], "%a, %B %d %Y")
-      "Mon, August 26 2019"
-
-      iex> Calendar.strftime(~U[2020-04-02 13:52:06.0Z], "%B %-d, %Y")
-      "April 2, 2020"
-
-      iex> Calendar.strftime(~U[2019-08-26 13:52:06.0Z], "%c")
-      "2019-08-26 13:52:06"
-
-  With options:
-
-      iex> Calendar.strftime(~U[2019-08-26 13:52:06.0Z], "%c", preferred_datetime: "%H:%M:%S %d-%m-%y")
-      "13:52:06 26-08-19"
-
-      iex> Calendar.strftime(
-      ...>  ~U[2019-08-26 13:52:06.0Z],
-      ...>  "%A",
-      ...>  day_of_week_names: fn day_of_week ->
-      ...>    {"segunda-feira", "terça-feira", "quarta-feira", "quinta-feira",
-      ...>    "sexta-feira", "sábado", "domingo"}
-      ...>    |> elem(day_of_week - 1)
-      ...>  end
-      ...>)
-      "segunda-feira"
-
-      iex> Calendar.strftime(
-      ...>  ~U[2019-08-26 13:52:06.0Z],
-      ...>  "%B",
-      ...>  month_names: fn month ->
-      ...>    {"январь", "февраль", "март", "апрель", "май", "июнь",
-      ...>    "июль", "август", "сентябрь", "октябрь", "ноябрь", "декабрь"}
-      ...>    |> elem(month - 1)
-      ...>  end
-      ...>)
-      "август"
-  """
-  @doc since: "1.11.0"
-  @spec strftime(map(), String.t(), keyword()) :: String.t()
-  def strftime(date_or_time_or_datetime, string_format, user_options \\ [])
-      when is_map(date_or_time_or_datetime) and is_binary(string_format) do
-    parse(
-      string_format,
-      date_or_time_or_datetime,
-      options(user_options),
-      []
-    )
-    |> IO.iodata_to_binary()
-  end
-
-  defp parse("", _datetime, _format_options, acc),
-    do: Enum.reverse(acc)
-
-  defp parse("%" <> rest, datetime, format_options, acc),
-    do: parse_modifiers(rest, nil, nil, {datetime, format_options, acc})
-
-  defp parse(<<char, rest::binary>>, datetime, format_options, acc),
-    do: parse(rest, datetime, format_options, [char | acc])
-
-  defp parse_modifiers("-" <> rest, width, nil, parser_data) do
-    parse_modifiers(rest, width, "", parser_data)
-  end
-
-  defp parse_modifiers("0" <> rest, width, nil, parser_data) do
-    parse_modifiers(rest, width, ?0, parser_data)
-  end
-
-  defp parse_modifiers("_" <> rest, width, nil, parser_data) do
-    parse_modifiers(rest, width, ?\s, parser_data)
-  end
-
-  defp parse_modifiers(<<digit, rest::binary>>, width, pad, parser_data) when digit in ?0..?9 do
-    new_width = (width || 0) * 10 + (digit - ?0)
-
-    parse_modifiers(rest, new_width, pad, parser_data)
-  end
-
-  # set default padding if none was specified
-  defp parse_modifiers(<<format, _::binary>> = rest, width, nil, parser_data) do
-    parse_modifiers(rest, width, default_pad(format), parser_data)
-  end
-
-  # set default width if none was specified
-  defp parse_modifiers(<<format, _::binary>> = rest, nil, pad, parser_data) do
-    parse_modifiers(rest, default_width(format), pad, parser_data)
-  end
-
-  defp parse_modifiers(rest, width, pad, {datetime, format_options, acc}) do
-    format_modifiers(rest, width, pad, datetime, format_options, acc)
-  end
-
-  defp am_pm(hour, format_options) when hour > 11 do
-    format_options.am_pm_names.(:pm)
-  end
-
-  defp am_pm(hour, format_options) when hour <= 11 do
-    format_options.am_pm_names.(:am)
-  end
-
-  defp default_pad(format) when format in 'aAbBpPZ', do: ?\s
-  defp default_pad(_format), do: ?0
-
-  defp default_width(format) when format in 'dHImMSy', do: 2
-  defp default_width(?j), do: 3
-  defp default_width(format) when format in 'Yz', do: 4
-  defp default_width(_format), do: 0
-
-  # Literally just %
-  defp format_modifiers("%" <> rest, width, pad, datetime, format_options, acc) do
-    parse(rest, datetime, format_options, [pad_leading("%", width, pad) | acc])
-  end
-
-  # Abbreviated name of day
-  defp format_modifiers("a" <> rest, width, pad, datetime, format_options, acc) do
-    result =
-      datetime
-      |> Date.day_of_week()
-      |> format_options.abbreviated_day_of_week_names.()
-      |> pad_leading(width, pad)
-
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Full name of day
-  defp format_modifiers("A" <> rest, width, pad, datetime, format_options, acc) do
-    result =
-      datetime
-      |> Date.day_of_week()
-      |> format_options.day_of_week_names.()
-      |> pad_leading(width, pad)
-
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Abbreviated month name
-  defp format_modifiers("b" <> rest, width, pad, datetime, format_options, acc) do
-    result =
-      datetime.month
-      |> format_options.abbreviated_month_names.()
-      |> pad_leading(width, pad)
-
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Full month name
-  defp format_modifiers("B" <> rest, width, pad, datetime, format_options, acc) do
-    result = datetime.month |> format_options.month_names.() |> pad_leading(width, pad)
-
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Preferred date+time representation
-  defp format_modifiers(
-         "c" <> _rest,
-         _width,
-         _pad,
-         _datetime,
-         %{preferred_datetime_invoked: true},
-         _acc
-       ) do
-    raise ArgumentError,
-          "tried to format preferred_datetime within another preferred_datetime format"
-  end
-
-  defp format_modifiers("c" <> rest, width, pad, datetime, format_options, acc) do
-    result =
-      format_options.preferred_datetime
-      |> parse(datetime, %{format_options | preferred_datetime_invoked: true}, [])
-      |> pad_preferred(width, pad)
-
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Day of the month
-  defp format_modifiers("d" <> rest, width, pad, datetime, format_options, acc) do
-    result = datetime.day |> Integer.to_string() |> pad_leading(width, pad)
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Microseconds
-  defp format_modifiers("f" <> rest, _width, _pad, datetime, format_options, acc) do
-    {microsecond, precision} = datetime.microsecond
-
-    result =
-      microsecond
-      |> Integer.to_string()
-      |> String.pad_leading(6, "0")
-      |> binary_part(0, max(precision, 1))
-
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Hour using a 24-hour clock
-  defp format_modifiers("H" <> rest, width, pad, datetime, format_options, acc) do
-    result = datetime.hour |> Integer.to_string() |> pad_leading(width, pad)
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Hour using a 12-hour clock
-  defp format_modifiers("I" <> rest, width, pad, datetime, format_options, acc) do
-    result = (rem(datetime.hour() + 23, 12) + 1) |> Integer.to_string() |> pad_leading(width, pad)
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Day of the year
-  defp format_modifiers("j" <> rest, width, pad, datetime, format_options, acc) do
-    result = datetime |> Date.day_of_year() |> Integer.to_string() |> pad_leading(width, pad)
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Month
-  defp format_modifiers("m" <> rest, width, pad, datetime, format_options, acc) do
-    result = datetime.month |> Integer.to_string() |> pad_leading(width, pad)
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Minute
-  defp format_modifiers("M" <> rest, width, pad, datetime, format_options, acc) do
-    result = datetime.minute |> Integer.to_string() |> pad_leading(width, pad)
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # "AM" or "PM" (noon is "PM", midnight as "AM")
-  defp format_modifiers("p" <> rest, width, pad, datetime, format_options, acc) do
-    result = datetime.hour |> am_pm(format_options) |> String.upcase() |> pad_leading(width, pad)
-
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # "am" or "pm" (noon is "pm", midnight as "am")
-  defp format_modifiers("P" <> rest, width, pad, datetime, format_options, acc) do
-    result =
-      datetime.hour
-      |> am_pm(format_options)
-      |> String.downcase()
-      |> pad_leading(width, pad)
-
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Quarter
-  defp format_modifiers("q" <> rest, width, pad, datetime, format_options, acc) do
-    result = datetime |> Date.quarter_of_year() |> Integer.to_string() |> pad_leading(width, pad)
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Second
-  defp format_modifiers("S" <> rest, width, pad, datetime, format_options, acc) do
-    result = datetime.second |> Integer.to_string() |> pad_leading(width, pad)
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Day of the week
-  defp format_modifiers("u" <> rest, width, pad, datetime, format_options, acc) do
-    result = datetime |> Date.day_of_week() |> Integer.to_string() |> pad_leading(width, pad)
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Preferred date (without time) representation
-  defp format_modifiers(
-         "x" <> _rest,
-         _width,
-         _pad,
-         _datetime,
-         %{preferred_date_invoked: true},
-         _acc
-       ) do
-    raise ArgumentError,
-          "tried to format preferred_date within another preferred_date format"
-  end
-
-  defp format_modifiers("x" <> rest, width, pad, datetime, format_options, acc) do
-    result =
-      format_options.preferred_date
-      |> parse(datetime, %{format_options | preferred_date_invoked: true}, [])
-      |> pad_preferred(width, pad)
-
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Preferred time (without date) representation
-  defp format_modifiers(
-         "X" <> _rest,
-         _width,
-         _pad,
-         _datetime,
-         %{preferred_time_invoked: true},
-         _acc
-       ) do
-    raise ArgumentError,
-          "tried to format preferred_time within another preferred_time format"
-  end
-
-  defp format_modifiers("X" <> rest, width, pad, datetime, format_options, acc) do
-    result =
-      format_options.preferred_time
-      |> parse(datetime, %{format_options | preferred_time_invoked: true}, [])
-      |> pad_preferred(width, pad)
-
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Year as 2-digits
-  defp format_modifiers("y" <> rest, width, pad, datetime, format_options, acc) do
-    result = datetime.year |> rem(100) |> Integer.to_string() |> pad_leading(width, pad)
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # Year
-  defp format_modifiers("Y" <> rest, width, pad, datetime, format_options, acc) do
-    result = datetime.year |> Integer.to_string() |> pad_leading(width, pad)
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  # +hhmm/-hhmm time zone offset from UTC (empty string if naive)
-  defp format_modifiers(
-         "z" <> rest,
-         width,
-         pad,
-         datetime = %{utc_offset: utc_offset, std_offset: std_offset},
-         format_options,
-         acc
-       ) do
-    absolute_offset = abs(utc_offset + std_offset)
-
-    offset_number =
-      Integer.to_string(div(absolute_offset, 3600) * 100 + rem(div(absolute_offset, 60), 60))
-
-    sign = if utc_offset + std_offset >= 0, do: "+", else: "-"
-    result = "#{sign}#{pad_leading(offset_number, width, pad)}"
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  defp format_modifiers("z" <> rest, _width, _pad, datetime, format_options, acc) do
-    parse(rest, datetime, format_options, ["" | acc])
-  end
-
-  # Time zone abbreviation (empty string if naive)
-  defp format_modifiers("Z" <> rest, width, pad, datetime, format_options, acc) do
-    result = datetime |> Map.get(:zone_abbr, "") |> pad_leading(width, pad)
-    parse(rest, datetime, format_options, [result | acc])
-  end
-
-  defp format_modifiers(rest, _width, _pad, _datetime, _format_options, _acc) do
-    {next, _rest} = String.next_grapheme(rest) || {"", ""}
-    raise ArgumentError, "invalid strftime format: %#{next}"
-  end
-
-  defp pad_preferred(result, width, pad) when length(result) < width do
-    pad_preferred([pad | result], width, pad)
-  end
-
-  defp pad_preferred(result, _width, _pad), do: result
-
-  defp pad_leading(string, count, padding) do
-    to_pad = count - byte_size(string)
-    if to_pad > 0, do: do_pad_leading(to_pad, padding, string), else: string
-  end
-
-  defp do_pad_leading(0, _, acc), do: acc
-
-  defp do_pad_leading(count, padding, acc),
-    do: do_pad_leading(count - 1, padding, [padding | acc])
-
-  defp options(user_options) do
-    default_options = %{
-      preferred_date: "%Y-%m-%d",
-      preferred_time: "%H:%M:%S",
-      preferred_datetime: "%Y-%m-%d %H:%M:%S",
-      am_pm_names: fn
-        :am -> "am"
-        :pm -> "pm"
-      end,
-      month_names: fn month ->
-        {"January", "February", "March", "April", "May", "June", "July", "August", "September",
-         "October", "November", "December"}
-        |> elem(month - 1)
-      end,
-      day_of_week_names: fn day_of_week ->
-        {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"}
-        |> elem(day_of_week - 1)
-      end,
-      abbreviated_month_names: fn month ->
-        {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}
-        |> elem(month - 1)
-      end,
-      abbreviated_day_of_week_names: fn day_of_week ->
-        {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"} |> elem(day_of_week - 1)
-      end,
-      preferred_datetime_invoked: false,
-      preferred_date_invoked: false,
-      preferred_time_invoked: false
-    }
-
-    Enum.reduce(user_options, default_options, fn {key, value}, acc ->
-      if Map.has_key?(acc, key) do
-        %{acc | key => value}
-      else
-        raise ArgumentError, "unknown option #{inspect(key)} given to Calendar.strftime/3"
-      end
-    end)
-  end
-end
@@ -1,227 +0,0 @@
-defmodule Date.Range do
-  @moduledoc """
-  Returns an inclusive range between dates.
-
-  Ranges must be created with the `Date.range/2` or `Date.range/3` function.
-
-  The following fields are public:
-
-    * `:first` - the initial date on the range
-    * `:last` - the last date on the range
-    * `:step` - (since v1.12.0) the step
-
-  The remaining fields are private and should not be accessed.
-  """
-
-  @type t :: %__MODULE__{
-          first: Date.t(),
-          last: Date.t(),
-          first_in_iso_days: iso_days(),
-          last_in_iso_days: iso_days(),
-          step: pos_integer | neg_integer
-        }
-
-  @typep iso_days() :: Calendar.iso_days()
-
-  @enforce_keys [:first, :last, :first_in_iso_days, :last_in_iso_days, :step]
-  defstruct [:first, :last, :first_in_iso_days, :last_in_iso_days, :step]
-
-  defimpl Enumerable do
-    def member?(
-          %Date.Range{
-            first: %{calendar: calendar},
-            first_in_iso_days: first_days,
-            last_in_iso_days: last_days,
-            step: step
-          } = range,
-          %Date{calendar: calendar} = date
-        ) do
-      {days, _} = Date.to_iso_days(date)
-
-      cond do
-        empty?(range) ->
-          {:ok, false}
-
-        first_days <= last_days ->
-          {:ok, first_days <= days and days <= last_days and rem(days - first_days, step) == 0}
-
-        true ->
-          {:ok, last_days <= days and days <= first_days and rem(days - first_days, step) == 0}
-      end
-    end
-
-    def member?(%Date.Range{step: _}, _) do
-      {:ok, false}
-    end
-
-    # TODO: Remove me on v2.0
-    def member?(
-          %{__struct__: Date.Range, first_in_iso_days: first_days, last_in_iso_days: last_days} =
-            date_range,
-          date
-        ) do
-      step = if first_days <= last_days, do: 1, else: -1
-      member?(Map.put(date_range, :step, step), date)
-    end
-
-    def count(range) do
-      {:ok, size(range)}
-    end
-
-    def slice(
-          %Date.Range{
-            first_in_iso_days: first,
-            first: %{calendar: calendar},
-            step: step
-          } = range
-        ) do
-      {:ok, size(range), &slice(first + &1 * step, step, &2, calendar)}
-    end
-
-    # TODO: Remove me on v2.0
-    def slice(
-          %{__struct__: Date.Range, first_in_iso_days: first_days, last_in_iso_days: last_days} =
-            date_range
-        ) do
-      step = if first_days <= last_days, do: 1, else: -1
-      slice(Map.put(date_range, :step, step))
-    end
-
-    defp slice(current, _step, 1, calendar) do
-      [date_from_iso_days(current, calendar)]
-    end
-
-    defp slice(current, step, remaining, calendar) do
-      [
-        date_from_iso_days(current, calendar)
-        | slice(current + step, step, remaining - 1, calendar)
-      ]
-    end
-
-    def reduce(
-          %Date.Range{
-            first_in_iso_days: first_days,
-            last_in_iso_days: last_days,
-            first: %{calendar: calendar},
-            step: step
-          },
-          acc,
-          fun
-        ) do
-      reduce(first_days, last_days, acc, fun, step, calendar)
-    end
-
-    # TODO: Remove me on v2.0
-    def reduce(
-          %{__struct__: Date.Range, first_in_iso_days: first_days, last_in_iso_days: last_days} =
-            date_range,
-          acc,
-          fun
-        ) do
-      step = if first_days <= last_days, do: 1, else: -1
-      reduce(Map.put(date_range, :step, step), acc, fun)
-    end
-
-    defp reduce(_first_days, _last_days, {:halt, acc}, _fun, _step, _calendar) do
-      {:halted, acc}
-    end
-
-    defp reduce(first_days, last_days, {:suspend, acc}, fun, step, calendar) do
-      {:suspended, acc, &reduce(first_days, last_days, &1, fun, step, calendar)}
-    end
-
-    defp reduce(first_days, last_days, {:cont, acc}, fun, step, calendar)
-         when step > 0 and first_days <= last_days
-         when step < 0 and first_days >= last_days do
-      reduce(
-        first_days + step,
-        last_days,
-        fun.(date_from_iso_days(first_days, calendar), acc),
-        fun,
-        step,
-        calendar
-      )
-    end
-
-    defp reduce(_, _, {:cont, acc}, _fun, _step, _calendar) do
-      {:done, acc}
-    end
-
-    defp date_from_iso_days(days, Calendar.ISO) do
-      {year, month, day} = Calendar.ISO.date_from_iso_days(days)
-      %Date{year: year, month: month, day: day, calendar: Calendar.ISO}
-    end
-
-    defp date_from_iso_days(days, calendar) do
-      {year, month, day, _, _, _, _} =
-        calendar.naive_datetime_from_iso_days({days, {0, 86_400_000_000}})
-
-      %Date{year: year, month: month, day: day, calendar: calendar}
-    end
-
-    defp size(%Date.Range{first_in_iso_days: first_days, last_in_iso_days: last_days, step: step})
-         when step > 0 and first_days > last_days,
-         do: 0
-
-    defp size(%Date.Range{first_in_iso_days: first_days, last_in_iso_days: last_days, step: step})
-         when step < 0 and first_days < last_days,
-         do: 0
-
-    defp size(%Date.Range{first_in_iso_days: first_days, last_in_iso_days: last_days, step: step}),
-      do: abs(div(last_days - first_days, step)) + 1
-
-    # TODO: Remove me on v2.0
-    defp size(
-           %{__struct__: Date.Range, first_in_iso_days: first_days, last_in_iso_days: last_days} =
-             date_range
-         ) do
-      step = if first_days <= last_days, do: 1, else: -1
-      size(Map.put(date_range, :step, step))
-    end
-
-    defp empty?(%Date.Range{
-           first_in_iso_days: first_days,
-           last_in_iso_days: last_days,
-           step: step
-         })
-         when step > 0 and first_days > last_days,
-         do: true
-
-    defp empty?(%Date.Range{
-           first_in_iso_days: first_days,
-           last_in_iso_days: last_days,
-           step: step
-         })
-         when step < 0 and first_days < last_days,
-         do: true
-
-    defp empty?(%Date.Range{step: _}), do: false
-
-    # TODO: Remove me on v2.0
-    defp empty?(
-           %{__struct__: Date.Range, first_in_iso_days: first_days, last_in_iso_days: last_days} =
-             date_range
-         ) do
-      step = if first_days <= last_days, do: 1, else: -1
-      empty?(Map.put(date_range, :step, step))
-    end
-  end
-
-  defimpl Inspect do
-    import Kernel, except: [inspect: 2]
-
-    def inspect(%Date.Range{first: first, last: last, step: 1}, _) do
-      "#DateRange<" <> inspect(first) <> ", " <> inspect(last) <> ">"
-    end
-
-    def inspect(%Date.Range{first: first, last: last, step: step}, _) do
-      "#DateRange<" <> inspect(first) <> ", " <> inspect(last) <> ", #{step}>"
-    end
-
-    # TODO: Remove me on v2.0
-    def inspect(%{__struct__: Date.Range, first: first, last: last} = date_range, opts) do
-      step = if first <= last, do: 1, else: -1
-      inspect(Map.put(date_range, :step, step), opts)
-    end
-  end
-end
@@ -1,784 +0,0 @@
-defmodule Time do
-  @moduledoc """
-  A Time struct and functions.
-
-  The Time struct contains the fields hour, minute, second and microseconds.
-  New times can be built with the `new/4` function or using the
-  `~T` (see `Kernel.sigil_T/2`) sigil:
-
-      iex> ~T[23:00:07.001]
-      ~T[23:00:07.001]
-
-  Both `new/4` and sigil return a struct where the time fields can
-  be accessed directly:
-
-      iex> time = ~T[23:00:07.001]
-      iex> time.hour
-      23
-      iex> time.microsecond
-      {1000, 3}
-
-  The functions on this module work with the `Time` struct as well
-  as any struct that contains the same fields as the `Time` struct,
-  such as `NaiveDateTime` and `DateTime`. Such functions expect
-  `t:Calendar.time/0` in their typespecs (instead of `t:t/0`).
-
-  Developers should avoid creating the Time structs directly
-  and instead rely on the functions provided by this module as well
-  as the ones in third-party calendar libraries.
-
-  ## Comparing times
-
-  Comparisons in Elixir using `==/2`, `>/2`, `</2` and similar are structural
-  and based on the `Time` struct fields. For proper comparison between
-  times, use the `compare/2` function.
-  """
-
-  @enforce_keys [:hour, :minute, :second]
-  defstruct [:hour, :minute, :second, microsecond: {0, 0}, calendar: Calendar.ISO]
-
-  @type t :: %__MODULE__{
-          hour: Calendar.hour(),
-          minute: Calendar.minute(),
-          second: Calendar.second(),
-          microsecond: Calendar.microsecond(),
-          calendar: Calendar.calendar()
-        }
-
-  @parts_per_day 86_400_000_000
-  @seconds_per_day 24 * 60 * 60
-
-  @doc """
-  Returns the current time in UTC.
-
-  ## Examples
-
-      iex> time = Time.utc_now()
-      iex> time.hour >= 0
-      true
-
-  """
-  @doc since: "1.4.0"
-  @spec utc_now(Calendar.calendar()) :: t
-  def utc_now(calendar \\ Calendar.ISO) do
-    {:ok, _, time, microsecond} = Calendar.ISO.from_unix(:os.system_time(), :native)
-    {hour, minute, second} = time
-
-    iso_time = %Time{
-      hour: hour,
-      minute: minute,
-      second: second,
-      microsecond: microsecond,
-      calendar: Calendar.ISO
-    }
-
-    convert!(iso_time, calendar)
-  end
-
-  @doc """
-  Builds a new time.
-
-  Expects all values to be integers. Returns `{:ok, time}` if each
-  entry fits its appropriate range, returns `{:error, reason}` otherwise.
-
-  Microseconds can also be given with a precision, which must be an
-  integer between 0 and 6.
-
-  The built-in calendar does not support leap seconds.
-
-  ## Examples
-
-      iex> Time.new(0, 0, 0, 0)
-      {:ok, ~T[00:00:00.000000]}
-      iex> Time.new(23, 59, 59, 999_999)
-      {:ok, ~T[23:59:59.999999]}
-
-      iex> Time.new(24, 59, 59, 999_999)
-      {:error, :invalid_time}
-      iex> Time.new(23, 60, 59, 999_999)
-      {:error, :invalid_time}
-      iex> Time.new(23, 59, 60, 999_999)
-      {:error, :invalid_time}
-      iex> Time.new(23, 59, 59, 1_000_000)
-      {:error, :invalid_time}
-
-      # Invalid precision
-      Time.new(23, 59, 59, {999_999, 10})
-      {:error, :invalid_time}
-
-  """
-  @spec new(
-          Calendar.hour(),
-          Calendar.minute(),
-          Calendar.second(),
-          Calendar.microsecond() | non_neg_integer,
-          Calendar.calendar()
-        ) :: {:ok, t} | {:error, atom}
-  def new(hour, minute, second, microsecond \\ {0, 0}, calendar \\ Calendar.ISO)
-
-  def new(hour, minute, second, microsecond, calendar) when is_integer(microsecond) do
-    new(hour, minute, second, {microsecond, 6}, calendar)
-  end
-
-  def new(hour, minute, second, {microsecond, precision}, calendar)
-      when is_integer(hour) and is_integer(minute) and is_integer(second) and
-             is_integer(microsecond) and is_integer(precision) do
-    case calendar.valid_time?(hour, minute, second, {microsecond, precision}) do
-      true ->
-        time = %Time{
-          hour: hour,
-          minute: minute,
-          second: second,
-          microsecond: {microsecond, precision},
-          calendar: calendar
-        }
-
-        {:ok, time}
-
-      false ->
-        {:error, :invalid_time}
-    end
-  end
-
-  @doc """
-  Builds a new time.
-
-  Expects all values to be integers. Returns `time` if each
-  entry fits its appropriate range, raises if the time is invalid.
-
-  Microseconds can also be given with a precision, which must be an
-  integer between 0 and 6.
-
-  The built-in calendar does not support leap seconds.
-
-  ## Examples
-
-      iex> Time.new!(0, 0, 0, 0)
-      ~T[00:00:00.000000]
-      iex> Time.new!(23, 59, 59, 999_999)
-      ~T[23:59:59.999999]
-      iex> Time.new!(24, 59, 59, 999_999)
-      ** (ArgumentError) cannot build time, reason: :invalid_time
-  """
-  @doc since: "1.11.0"
-  @spec new!(
-          Calendar.hour(),
-          Calendar.minute(),
-          Calendar.second(),
-          Calendar.microsecond() | non_neg_integer,
-          Calendar.calendar()
-        ) :: t
-  def new!(hour, minute, second, microsecond \\ {0, 0}, calendar \\ Calendar.ISO) do
-    case new(hour, minute, second, microsecond, calendar) do
-      {:ok, time} ->
-        time
-
-      {:error, reason} ->
-        raise ArgumentError, "cannot build time, reason: #{inspect(reason)}"
-    end
-  end
-
-  @doc """
-  Converts the given `time` to a string.
-
-  ### Examples
-
-      iex> Time.to_string(~T[23:00:00])
-      "23:00:00"
-      iex> Time.to_string(~T[23:00:00.001])
-      "23:00:00.001"
-      iex> Time.to_string(~T[23:00:00.123456])
-      "23:00:00.123456"
-
-      iex> Time.to_string(~N[2015-01-01 23:00:00.001])
-      "23:00:00.001"
-      iex> Time.to_string(~N[2015-01-01 23:00:00.123456])
-      "23:00:00.123456"
-
-  """
-  @spec to_string(Calendar.time()) :: String.t()
-  def to_string(time)
-
-  def to_string(%{
-        hour: hour,
-        minute: minute,
-        second: second,
-        microsecond: microsecond,
-        calendar: calendar
-      }) do
-    calendar.time_to_string(hour, minute, second, microsecond)
-  end
-
-  @doc """
-  Parses the extended "Local time" format described by
-  [ISO 8601:2019](https://en.wikipedia.org/wiki/ISO_8601).
-
-  Time zone offset may be included in the string but they will be
-  simply discarded as such information is not included in times.
-
-  As specified in the standard, the separator "T" may be omitted if
-  desired as there is no ambiguity within this function.
-
-  ## Examples
-
-      iex> Time.from_iso8601("23:50:07")
-      {:ok, ~T[23:50:07]}
-      iex> Time.from_iso8601("23:50:07Z")
-      {:ok, ~T[23:50:07]}
-      iex> Time.from_iso8601("T23:50:07Z")
-      {:ok, ~T[23:50:07]}
-
-      iex> Time.from_iso8601("23:50:07,0123456")
-      {:ok, ~T[23:50:07.012345]}
-      iex> Time.from_iso8601("23:50:07.0123456")
-      {:ok, ~T[23:50:07.012345]}
-      iex> Time.from_iso8601("23:50:07.123Z")
-      {:ok, ~T[23:50:07.123]}
-
-      iex> Time.from_iso8601("2015:01:23 23-50-07")
-      {:error, :invalid_format}
-      iex> Time.from_iso8601("23:50:07A")
-      {:error, :invalid_format}
-      iex> Time.from_iso8601("23:50:07.")
-      {:error, :invalid_format}
-      iex> Time.from_iso8601("23:50:61")
-      {:error, :invalid_time}
-
-  """
-  @spec from_iso8601(String.t(), Calendar.calendar()) :: {:ok, t} | {:error, atom}
-  def from_iso8601(string, calendar \\ Calendar.ISO) do
-    with {:ok, {hour, minute, second, microsecond}} <- Calendar.ISO.parse_time(string) do
-      convert(
-        %Time{hour: hour, minute: minute, second: second, microsecond: microsecond},
-        calendar
-      )
-    end
-  end
-
-  @doc """
-  Parses the extended "Local time" format described by
-  [ISO 8601:2019](https://en.wikipedia.org/wiki/ISO_8601).
-
-  Raises if the format is invalid.
-
-  ## Examples
-
-      iex> Time.from_iso8601!("23:50:07,123Z")
-      ~T[23:50:07.123]
-      iex> Time.from_iso8601!("23:50:07.123Z")
-      ~T[23:50:07.123]
-      iex> Time.from_iso8601!("2015:01:23 23-50-07")
-      ** (ArgumentError) cannot parse "2015:01:23 23-50-07" as time, reason: :invalid_format
-
-  """
-  @spec from_iso8601!(String.t(), Calendar.calendar()) :: t
-  def from_iso8601!(string, calendar \\ Calendar.ISO) do
-    case from_iso8601(string, calendar) do
-      {:ok, value} ->
-        value
-
-      {:error, reason} ->
-        raise ArgumentError, "cannot parse #{inspect(string)} as time, reason: #{inspect(reason)}"
-    end
-  end
-
-  @doc """
-  Converts the given time to
-  [ISO 8601:2019](https://en.wikipedia.org/wiki/ISO_8601).
-
-  By default, `Time.to_iso8601/2` returns times formatted in the "extended"
-  format, for human readability. It also supports the "basic" format through
-  passing the `:basic` option.
-
-  ### Examples
-
-      iex> Time.to_iso8601(~T[23:00:13])
-      "23:00:13"
-
-      iex> Time.to_iso8601(~T[23:00:13.001])
-      "23:00:13.001"
-
-      iex> Time.to_iso8601(~T[23:00:13.001], :basic)
-      "230013.001"
-
-      iex> Time.to_iso8601(~N[2010-04-17 23:00:13])
-      "23:00:13"
-
-  """
-  @spec to_iso8601(Calendar.time(), :extended | :basic) :: String.t()
-  def to_iso8601(time, format \\ :extended)
-
-  def to_iso8601(%{calendar: Calendar.ISO} = time, format) when format in [:extended, :basic] do
-    %{
-      hour: hour,
-      minute: minute,
-      second: second,
-      microsecond: microsecond
-    } = time
-
-    Calendar.ISO.time_to_string(hour, minute, second, microsecond, format)
-  end
-
-  def to_iso8601(%{calendar: _} = time, format) when format in [:extended, :basic] do
-    time
-    |> convert!(Calendar.ISO)
-    |> to_iso8601(format)
-  end
-
-  @doc """
-  Converts given `time` to an Erlang time tuple.
-
-  WARNING: Loss of precision may occur, as Erlang time tuples
-  only contain hours/minutes/seconds.
-
-  ## Examples
-
-      iex> Time.to_erl(~T[23:30:15.999])
-      {23, 30, 15}
-
-      iex> Time.to_erl(~N[2010-04-17 23:30:15.999])
-      {23, 30, 15}
-
-  """
-  @spec to_erl(Calendar.time()) :: :calendar.time()
-  def to_erl(time) do
-    %{hour: hour, minute: minute, second: second} = convert!(time, Calendar.ISO)
-    {hour, minute, second}
-  end
-
-  @doc """
-  Converts an Erlang time tuple to a `Time` struct.
-
-  ## Examples
-
-      iex> Time.from_erl({23, 30, 15}, {5000, 3})
-      {:ok, ~T[23:30:15.005]}
-      iex> Time.from_erl({24, 30, 15})
-      {:error, :invalid_time}
-
-  """
-  @spec from_erl(:calendar.time(), Calendar.microsecond(), Calendar.calendar()) ::
-          {:ok, t} | {:error, atom}
-  def from_erl(tuple, microsecond \\ {0, 0}, calendar \\ Calendar.ISO)
-
-  def from_erl({hour, minute, second}, microsecond, calendar) do
-    with {:ok, time} <- new(hour, minute, second, microsecond, Calendar.ISO),
-         do: convert(time, calendar)
-  end
-
-  @doc """
-  Converts an Erlang time tuple to a `Time` struct.
-
-  ## Examples
-
-      iex> Time.from_erl!({23, 30, 15})
-      ~T[23:30:15]
-      iex> Time.from_erl!({23, 30, 15}, {5000, 3})
-      ~T[23:30:15.005]
-      iex> Time.from_erl!({24, 30, 15})
-      ** (ArgumentError) cannot convert {24, 30, 15} to time, reason: :invalid_time
-
-  """
-  @spec from_erl!(:calendar.time(), Calendar.microsecond(), Calendar.calendar()) :: t
-  def from_erl!(tuple, microsecond \\ {0, 0}, calendar \\ Calendar.ISO) do
-    case from_erl(tuple, microsecond, calendar) do
-      {:ok, value} ->
-        value
-
-      {:error, reason} ->
-        raise ArgumentError,
-              "cannot convert #{inspect(tuple)} to time, reason: #{inspect(reason)}"
-    end
-  end
-
-  @doc """
-  Converts a number of seconds after midnight to a `Time` struct.
-
-  ## Examples
-
-      iex> Time.from_seconds_after_midnight(10_000)
-      ~T[02:46:40]
-      iex> Time.from_seconds_after_midnight(30_000, {5000, 3})
-      ~T[08:20:00.005]
-      iex> Time.from_seconds_after_midnight(-1)
-      ~T[23:59:59]
-      iex> Time.from_seconds_after_midnight(100_000)
-      ~T[03:46:40]
-
-  """
-  @doc since: "1.11.0"
-  @spec from_seconds_after_midnight(
-          integer(),
-          Calendar.microsecond(),
-          Calendar.calendar()
-        ) :: t
-  def from_seconds_after_midnight(seconds, microsecond \\ {0, 0}, calendar \\ Calendar.ISO)
-      when is_integer(seconds) do
-    seconds_in_day = Integer.mod(seconds, @seconds_per_day)
-
-    {hour, minute, second, {_, _}} =
-      calendar.time_from_day_fraction({seconds_in_day, @seconds_per_day})
-
-    %Time{
-      calendar: calendar,
-      hour: hour,
-      minute: minute,
-      second: second,
-      microsecond: microsecond
-    }
-  end
-
-  @doc """
-  Converts a `Time` struct to a number of seconds after midnight.
-
-  The returned value is a two-element tuple with the number of seconds and microseconds.
-
-  ## Examples
-
-      iex> Time.to_seconds_after_midnight(~T[23:30:15])
-      {84615, 0}
-      iex> Time.to_seconds_after_midnight(~N[2010-04-17 23:30:15.999])
-      {84615, 999000}
-
-  """
-  @doc since: "1.11.0"
-  @spec to_seconds_after_midnight(Calendar.time()) :: {integer(), non_neg_integer()}
-  def to_seconds_after_midnight(%{microsecond: {microsecond, _precision}} = time) do
-    iso_days = {0, to_day_fraction(time)}
-    {Calendar.ISO.iso_days_to_unit(iso_days, :second), microsecond}
-  end
-
-  @doc """
-  Adds the `number` of `unit`s to the given `time`.
-
-  This function accepts the `number` measured according to `Calendar.ISO`.
-  The time is returned in the same calendar as it was given in.
-
-  Note the result value represents the time of day, meaning that it is cyclic,
-  for instance, it will never go over 24 hours for the ISO calendar.
-
-  ## Examples
-
-      iex> Time.add(~T[10:00:00], 27000)
-      ~T[17:30:00.000000]
-      iex> Time.add(~T[11:00:00.005], 2400)
-      ~T[11:40:00.005000]
-      iex> Time.add(~T[00:00:00], 86_399_999, :millisecond)
-      ~T[23:59:59.999000]
-      iex> Time.add(~T[17:10:05], 86400)
-      ~T[17:10:05.000000]
-      iex> Time.add(~T[23:00:00], -60)
-      ~T[22:59:00.000000]
-
-  """
-  @doc since: "1.6.0"
-  @spec add(Calendar.time(), integer, System.time_unit()) :: t
-  def add(%{calendar: calendar} = time, number, unit \\ :second) when is_integer(number) do
-    number = System.convert_time_unit(number, unit, :microsecond)
-    total = time_to_microseconds(time) + number
-    parts = Integer.mod(total, @parts_per_day)
-    {hour, minute, second, microsecond} = calendar.time_from_day_fraction({parts, @parts_per_day})
-
-    %Time{
-      hour: hour,
-      minute: minute,
-      second: second,
-      microsecond: microsecond,
-      calendar: calendar
-    }
-  end
-
-  defp time_to_microseconds(%{
-         calendar: Calendar.ISO,
-         hour: 0,
-         minute: 0,
-         second: 0,
-         microsecond: {0, _}
-       }) do
-    0
-  end
-
-  defp time_to_microseconds(time) do
-    iso_days = {0, to_day_fraction(time)}
-    Calendar.ISO.iso_days_to_unit(iso_days, :microsecond)
-  end
-
-  @doc """
-  Compares two time structs.
-
-  Returns `:gt` if first time is later than the second
-  and `:lt` for vice versa. If the two times are equal
-  `:eq` is returned.
-
-  ## Examples
-
-      iex> Time.compare(~T[16:04:16], ~T[16:04:28])
-      :lt
-      iex> Time.compare(~T[16:04:16], ~T[16:04:16])
-      :eq
-      iex> Time.compare(~T[16:04:16.01], ~T[16:04:16.001])
-      :gt
-
-  This function can also be used to compare across more
-  complex calendar types by considering only the time fields:
-
-      iex> Time.compare(~N[1900-01-01 16:04:16], ~N[2015-01-01 16:04:16])
-      :eq
-      iex> Time.compare(~N[2015-01-01 16:04:16], ~N[2015-01-01 16:04:28])
-      :lt
-      iex> Time.compare(~N[2015-01-01 16:04:16.01], ~N[2000-01-01 16:04:16.001])
-      :gt
-
-  """
-  @doc since: "1.4.0"
-  @spec compare(Calendar.time(), Calendar.time()) :: :lt | :eq | :gt
-  def compare(%{calendar: calendar} = time1, %{calendar: calendar} = time2) do
-    %{hour: hour1, minute: minute1, second: second1, microsecond: {microsecond1, _}} = time1
-    %{hour: hour2, minute: minute2, second: second2, microsecond: {microsecond2, _}} = time2
-
-    case {{hour1, minute1, second1, microsecond1}, {hour2, minute2, second2, microsecond2}} do
-      {first, second} when first > second -> :gt
-      {first, second} when first < second -> :lt
-      _ -> :eq
-    end
-  end
-
-  def compare(time1, time2) do
-    {parts1, ppd1} = to_day_fraction(time1)
-    {parts2, ppd2} = to_day_fraction(time2)
-
-    case {parts1 * ppd2, parts2 * ppd1} do
-      {first, second} when first > second -> :gt
-      {first, second} when first < second -> :lt
-      _ -> :eq
-    end
-  end
-
-  @doc """
-  Converts given `time` to a different calendar.
-
-  Returns `{:ok, time}` if the conversion was successful,
-  or `{:error, reason}` if it was not, for some reason.
-
-  ## Examples
-
-  Imagine someone implements `Calendar.Holocene`, a calendar based on the
-  Gregorian calendar that adds exactly 10,000 years to the current Gregorian
-  year:
-
-      iex> Time.convert(~T[13:30:15], Calendar.Holocene)
-      {:ok, %Time{calendar: Calendar.Holocene, hour: 13, minute: 30, second: 15, microsecond: {0, 0}}}
-
-  """
-  @doc since: "1.5.0"
-  @spec convert(Calendar.time(), Calendar.calendar()) :: {:ok, t} | {:error, atom}
-
-  # Keep it multiline for proper function clause errors.
-  def convert(
-        %{
-          calendar: calendar,
-          hour: hour,
-          minute: minute,
-          second: second,
-          microsecond: microsecond
-        },
-        calendar
-      ) do
-    time = %Time{
-      calendar: calendar,
-      hour: hour,
-      minute: minute,
-      second: second,
-      microsecond: microsecond
-    }
-
-    {:ok, time}
-  end
-
-  def convert(%{microsecond: {_, precision}} = time, calendar) do
-    {hour, minute, second, {microsecond, _}} =
-      time
-      |> to_day_fraction()
-      |> calendar.time_from_day_fraction()
-
-    time = %Time{
-      calendar: calendar,
-      hour: hour,
-      minute: minute,
-      second: second,
-      microsecond: {microsecond, precision}
-    }
-
-    {:ok, time}
-  end
-
-  @doc """
-  Similar to `Time.convert/2`, but raises an `ArgumentError`
-  if the conversion between the two calendars is not possible.
-
-  ## Examples
-
-  Imagine someone implements `Calendar.Holocene`, a calendar based on the
-  Gregorian calendar that adds exactly 10,000 years to the current Gregorian
-  year:
-
-      iex> Time.convert!(~T[13:30:15], Calendar.Holocene)
-      %Time{calendar: Calendar.Holocene, hour: 13, minute: 30, second: 15, microsecond: {0, 0}}
-
-  """
-  @doc since: "1.5.0"
-  @spec convert!(Calendar.time(), Calendar.calendar()) :: t
-  def convert!(time, calendar) do
-    case convert(time, calendar) do
-      {:ok, value} ->
-        value
-
-      {:error, reason} ->
-        raise ArgumentError,
-              "cannot convert #{inspect(time)} to target calendar #{inspect(calendar)}, " <>
-                "reason: #{inspect(reason)}"
-    end
-  end
-
-  @doc """
-  Returns the difference between two times, considering only the hour, minute,
-  second and microsecond.
-
-  As with the `compare/2` function both `Time` structs and other structures
-  containing time can be used. If for instance a `NaiveDateTime` or `DateTime`
-  is passed, only the hour, minute, second, and microsecond is considered. Any
-  additional information about a date or time zone is ignored when calculating
-  the difference.
-
-  The answer can be returned in any `unit` available from
-  `t:System.time_unit/0`. If the first time value is earlier than
-  the second, a negative number is returned.
-
-  This function returns the difference in seconds where seconds
-  are measured according to `Calendar.ISO`.
-
-  ## Examples
-
-      iex> Time.diff(~T[00:29:12], ~T[00:29:10])
-      2
-
-      # When passing a `NaiveDateTime` the date part is ignored.
-      iex> Time.diff(~N[2017-01-01 00:29:12], ~T[00:29:10])
-      2
-
-      # Two `NaiveDateTime` structs could have big differences in the date
-      # but only the time part is considered.
-      iex> Time.diff(~N[2017-01-01 00:29:12], ~N[1900-02-03 00:29:10])
-      2
-
-      iex> Time.diff(~T[00:29:12], ~T[00:29:10], :microsecond)
-      2_000_000
-      iex> Time.diff(~T[00:29:10], ~T[00:29:12], :microsecond)
-      -2_000_000
-
-  """
-  @doc since: "1.5.0"
-  @spec diff(Calendar.time(), Calendar.time(), System.time_unit()) :: integer
-  def diff(time1, time2, unit \\ :second)
-
-  def diff(
-        %{
-          calendar: Calendar.ISO,
-          hour: hour1,
-          minute: minute1,
-          second: second1,
-          microsecond: {microsecond1, @parts_per_day}
-        },
-        %{
-          calendar: Calendar.ISO,
-          hour: hour2,
-          minute: minute2,
-          second: second2,
-          microsecond: {microsecond2, @parts_per_day}
-        },
-        unit
-      ) do
-    total =
-      (hour1 - hour2) * 3_600_000_000 + (minute1 - minute2) * 60_000_000 +
-        (second1 - second2) * 1_000_000 + (microsecond1 - microsecond2)
-
-    System.convert_time_unit(total, :microsecond, unit)
-  end
-
-  def diff(time1, time2, unit) do
-    fraction1 = to_day_fraction(time1)
-    fraction2 = to_day_fraction(time2)
-
-    Calendar.ISO.iso_days_to_unit({0, fraction1}, unit) -
-      Calendar.ISO.iso_days_to_unit({0, fraction2}, unit)
-  end
-
-  @doc """
-  Returns the given time with the microsecond field truncated to the given
-  precision (`:microsecond`, `millisecond` or `:second`).
-
-  The given time is returned unchanged if it already has lower precision than
-  the given precision.
-
-  ## Examples
-
-      iex> Time.truncate(~T[01:01:01.123456], :microsecond)
-      ~T[01:01:01.123456]
-
-      iex> Time.truncate(~T[01:01:01.123456], :millisecond)
-      ~T[01:01:01.123]
-
-      iex> Time.truncate(~T[01:01:01.123456], :second)
-      ~T[01:01:01]
-
-  """
-  @doc since: "1.6.0"
-  @spec truncate(t(), :microsecond | :millisecond | :second) :: t()
-  def truncate(%Time{microsecond: microsecond} = time, precision) do
-    %{time | microsecond: Calendar.truncate(microsecond, precision)}
-  end
-
-  ## Helpers
-
-  defp to_day_fraction(%{
-         hour: hour,
-         minute: minute,
-         second: second,
-         microsecond: {_, _} = microsecond,
-         calendar: calendar
-       }) do
-    calendar.time_to_day_fraction(hour, minute, second, microsecond)
-  end
-
-  defimpl String.Chars do
-    def to_string(time) do
-      %{
-        hour: hour,
-        minute: minute,
-        second: second,
-        microsecond: microsecond,
-        calendar: calendar
-      } = time
-
-      calendar.time_to_string(hour, minute, second, microsecond)
-    end
-  end
-
-  defimpl Inspect do
-    def inspect(time, _) do
-      %{
-        hour: hour,
-        minute: minute,
-        second: second,
-        microsecond: microsecond,
-        calendar: calendar
-      } = time
-
-      "~T[" <>
-        calendar.time_to_string(hour, minute, second, microsecond) <> suffix(calendar) <> "]"
-    end
-
-    defp suffix(Calendar.ISO), do: ""
-    defp suffix(calendar), do: " " <> inspect(calendar)
-  end
-end
@@ -1,96 +0,0 @@
-defmodule Calendar.TimeZoneDatabase do
-  @moduledoc """
-  This module defines a behaviour for providing time zone data.
-
-  IANA provides time zone data that includes data about different
-  UTC offsets and standard offsets for time zones.
-  """
-
-  @typedoc """
-  A period where a certain combination of UTC offset, standard offset and zone
-  abbreviation is in effect.
-
-  For instance one period could be the summer of 2018 in "Europe/London" where summer time /
-  daylight saving time is in effect and lasts from spring to autumn. At autumn the `std_offset`
-  changes along with the `zone_abbr` so a different period is needed during winter.
-  """
-  @type time_zone_period :: %{
-          optional(any) => any,
-          utc_offset: Calendar.utc_offset(),
-          std_offset: Calendar.std_offset(),
-          zone_abbr: Calendar.zone_abbr()
-        }
-
-  @typedoc """
-  Limit for when a certain time zone period begins or ends.
-
-  A beginning is inclusive. An ending is exclusive. Eg. if a period is from
-  2015-03-29 01:00:00 and until 2015-10-25 01:00:00, the period includes and
-  begins from the beginning of 2015-03-29 01:00:00 and lasts until just before
-  2015-10-25 01:00:00.
-
-  A beginning or end for certain periods are infinite. For instance the latest
-  period for time zones without DST or plans to change. However for the purpose
-  of this behaviour they are only used for gaps in wall time where the needed
-  period limits are at a certain time.
-  """
-  @type time_zone_period_limit :: Calendar.naive_datetime()
-
-  @doc """
-  Time zone period for a point in time in UTC for a specific time zone.
-
-  Takes a time zone name and a point in time for UTC and returns a
-  `time_zone_period` for that point in time.
-  """
-  @doc since: "1.8.0"
-  @callback time_zone_period_from_utc_iso_days(Calendar.iso_days(), Calendar.time_zone()) ::
-              {:ok, time_zone_period}
-              | {:error, :time_zone_not_found | :utc_only_time_zone_database}
-
-  @doc """
-  Possible time zone periods for a certain time zone and wall clock date and time.
-
-  When the provided `datetime` is ambiguous a tuple with `:ambiguous` and two possible
-  periods. The periods in the list are sorted with the first element being the one that begins first.
-
-  When the provided `datetime` is in a gap - for instance during the "spring forward" when going
-  from winter time to summer time, a tuple with `:gap` and two periods with limits are returned
-  in a nested tuple. The first nested two-tuple is the period before the gap and a naive datetime
-  with a limit for when the period ends (wall time). The second nested two-tuple is the period
-  just after the gap and a datetime (wall time) for when the period begins just after the gap.
-
-  If there is only a single possible period for the provided `datetime`, then a tuple with `:ok`
-  and the `time_zone_period` is returned.
-  """
-  @doc since: "1.8.0"
-  @callback time_zone_periods_from_wall_datetime(Calendar.naive_datetime(), Calendar.time_zone()) ::
-              {:ok, time_zone_period}
-              | {:ambiguous, time_zone_period, time_zone_period}
-              | {:gap, {time_zone_period, time_zone_period_limit},
-                 {time_zone_period, time_zone_period_limit}}
-              | {:error, :time_zone_not_found | :utc_only_time_zone_database}
-end
-
-defmodule Calendar.UTCOnlyTimeZoneDatabase do
-  @moduledoc """
-  Built-in time zone database that works only in Etc/UTC.
-
-  For all other time zones, it returns `{:error, :utc_only_time_zone_database}`.
-  """
-
-  @behaviour Calendar.TimeZoneDatabase
-
-  @impl true
-  def time_zone_period_from_utc_iso_days(_, "Etc/UTC"),
-    do: {:ok, %{std_offset: 0, utc_offset: 0, zone_abbr: "UTC"}}
-
-  def time_zone_period_from_utc_iso_days(_, _),
-    do: {:error, :utc_only_time_zone_database}
-
-  @impl true
-  def time_zone_periods_from_wall_datetime(_, "Etc/UTC"),
-    do: {:ok, %{std_offset: 0, utc_offset: 0, zone_abbr: "UTC"}}
-
-  def time_zone_periods_from_wall_datetime(_, _),
-    do: {:error, :utc_only_time_zone_database}
-end
@@ -1,841 +0,0 @@
-defmodule Code.Fragment do
-  @moduledoc """
-  This module provides conveniences for analyzing fragments of
-  textual code and extract available information whenever possible.
-
-  Most of the functions in this module provide a best-effort
-  and may not be accurate under all circumstances. Read each
-  documentation for more information.
-
-  This module should be considered experimental.
-  """
-
-  @type position :: {line :: pos_integer(), column :: pos_integer()}
-
-  @doc """
-  Receives a string and returns the cursor context.
-
-  This function receives a string with an Elixir code fragment,
-  representing a cursor position, and based on the string, it
-  provides contextual information about said position. The
-  return of this function can then be used to provide tips,
-  suggestions, and autocompletion functionality.
-
-  This function provides a best-effort detection and may not be
-  accurate under all circumstances. See the "Limitations"
-  section below.
-
-  Consider adding a catch-all clause when handling the return
-  type of this function as new cursor information may be added
-  in future releases.
-
-  ## Examples
-
-      iex> Code.Fragment.cursor_context("")
-      :expr
-
-      iex> Code.Fragment.cursor_context("hello_wor")
-      {:local_or_var, 'hello_wor'}
-
-  ## Return values
-
-    * `{:alias, charlist}` - the context is an alias, potentially
-      a nested one, such as `Hello.Wor` or `HelloWor`
-
-    * `{:dot, inside_dot, charlist}` - the context is a dot
-      where `inside_dot` is either a `{:var, charlist}`, `{:alias, charlist}`,
-      `{:module_attribute, charlist}`, `{:unquoted_atom, charlist}` or a `dot`
-      itself. If a var is given, this may either be a remote call or a map
-      field access. Examples are `Hello.wor`, `:hello.wor`, `hello.wor`,
-      `Hello.nested.wor`, `hello.nested.wor`, and `@hello.world`
-
-    * `{:dot_arity, inside_dot, charlist}` - the context is a dot arity
-      where `inside_dot` is either a `{:var, charlist}`, `{:alias, charlist}`,
-      `{:module_attribute, charlist}`, `{:unquoted_atom, charlist}` or a `dot`
-      itself. If a var is given, it must be a remote arity. Examples are
-      `Hello.world/`, `:hello.world/`, `hello.world/2`, and `@hello.world/2`
-
-    * `{:dot_call, inside_dot, charlist}` - the context is a dot
-      call. This means parentheses or space have been added after the expression.
-      where `inside_dot` is either a `{:var, charlist}`, `{:alias, charlist}`,
-      `{:module_attribute, charlist}`, `{:unquoted_atom, charlist}` or a `dot`
-      itself. If a var is given, it must be a remote call. Examples are
-      `Hello.world(`, `:hello.world(`, `Hello.world `, `hello.world(`, `hello.world `,
-      and `@hello.world(`
-
-    * `:expr` - may be any expression. Autocompletion may suggest an alias,
-      local or var
-
-    * `{:local_or_var, charlist}` - the context is a variable or a local
-      (import or local) call, such as `hello_wor`
-
-    * `{:local_arity, charlist}` - the context is a local (import or local)
-      arity, such as `hello_world/`
-
-    * `{:local_call, charlist}` - the context is a local (import or local)
-      call, such as `hello_world(` and `hello_world `
-
-    * `{:module_attribute, charlist}` - the context is a module attribute,
-      such as `@hello_wor`
-
-    * `{:operator, charlist}` - the context is an operator, such as `+` or
-      `==`. Note textual operators, such as `when` do not appear as operators
-      but rather as `:local_or_var`. `@` is never an `:operator` and always a
-      `:module_attribute`
-
-    * `{:operator_arity, charlist}` - the context is an operator arity, which
-      is an operator followed by /, such as `+/`, `not/` or `when/`
-
-    * `{:operator_call, charlist}` - the context is an operator call, which is
-      an operator followed by space, such as `left + `, `not ` or `x when `
-
-    * `:none` - no context possible
-
-    * `{:sigil, charlist}` - the context is a sigil. It may be either the beginning
-      of a sigil, such as `~` or `~s`, or an operator starting with `~`, such as
-      `~>` and `~>>`
-
-    * `{:struct, charlist}` - the context is a struct, such as `%`, `%UR` or `%URI`
-
-    * `{:unquoted_atom, charlist}` - the context is an unquoted atom. This
-      can be any atom or an atom representing a module
-
-  ## Limitations
-
-  The current algorithm only considers the last line of the input. This means
-  it will also show suggestions inside strings, heredocs, etc, which is
-  intentional as it helps with doctests, references, and more.
-  """
-  @doc since: "1.13.0"
-  @spec cursor_context(List.Chars.t(), keyword()) ::
-          {:alias, charlist}
-          | {:dot, inside_dot, charlist}
-          | {:dot_arity, inside_dot, charlist}
-          | {:dot_call, inside_dot, charlist}
-          | :expr
-          | {:local_or_var, charlist}
-          | {:local_arity, charlist}
-          | {:local_call, charlist}
-          | {:module_attribute, charlist}
-          | {:operator, charlist}
-          | {:operator_arity, charlist}
-          | {:operator_call, charlist}
-          | :none
-          | {:sigil, charlist}
-          | {:struct, charlist}
-          | {:unquoted_atom, charlist}
-        when inside_dot:
-               {:alias, charlist}
-               | {:dot, inside_dot, charlist}
-               | {:module_attribute, charlist}
-               | {:unquoted_atom, charlist}
-               | {:var, charlist}
-  def cursor_context(fragment, opts \\ [])
-
-  def cursor_context(binary, opts) when is_binary(binary) and is_list(opts) do
-    binary =
-      case :binary.matches(binary, "\n") do
-        [] ->
-          binary
-
-        matches ->
-          {position, _} = List.last(matches)
-          binary_part(binary, position + 1, byte_size(binary) - position - 1)
-      end
-
-    binary
-    |> String.to_charlist()
-    |> :lists.reverse()
-    |> codepoint_cursor_context(opts)
-    |> elem(0)
-  end
-
-  def cursor_context(charlist, opts) when is_list(charlist) and is_list(opts) do
-    charlist =
-      case charlist |> Enum.chunk_by(&(&1 == ?\n)) |> List.last([]) do
-        [?\n | _] -> []
-        rest -> rest
-      end
-
-    charlist
-    |> :lists.reverse()
-    |> codepoint_cursor_context(opts)
-    |> elem(0)
-  end
-
-  def cursor_context(other, opts) when is_list(opts) do
-    cursor_context(to_charlist(other), opts)
-  end
-
-  @operators '\\<>+-*/:=|&~^%!'
-  @starter_punctuation ',([{;'
-  @non_starter_punctuation ')]}"\'.$'
-  @space '\t\s'
-  @trailing_identifier '?!'
-  @tilde_op_prefix '<=~'
-
-  @non_identifier @trailing_identifier ++
-                    @operators ++ @starter_punctuation ++ @non_starter_punctuation ++ @space
-
-  @textual_operators ~w(when not and or in)c
-  @incomplete_operators ~w(^^ ~~ ~)c
-
-  defp codepoint_cursor_context(reverse, _opts) do
-    {stripped, spaces} = strip_spaces(reverse, 0)
-
-    case stripped do
-      # It is empty
-      [] -> {:expr, 0}
-      # Structs
-      [?%, ?:, ?: | _] -> {{:struct, ''}, 1}
-      [?%, ?: | _] -> {{:unquoted_atom, '%'}, 2}
-      [?% | _] -> {{:struct, ''}, 1}
-      # Token/AST only operators
-      [?>, ?= | rest] when rest == [] or hd(rest) != ?: -> {:expr, 0}
-      [?>, ?- | rest] when rest == [] or hd(rest) != ?: -> {:expr, 0}
-      # Two-digit containers
-      [?<, ?< | rest] when rest == [] or hd(rest) != ?< -> {:expr, 0}
-      # Ambiguity around :
-      [?: | rest] when rest == [] or hd(rest) != ?: -> unquoted_atom_or_expr(spaces)
-      # Dots
-      [?.] -> {:none, 0}
-      [?. | rest] when hd(rest) not in '.:' -> dot(rest, spaces + 1, '')
-      # It is a local or remote call with parens
-      [?( | rest] -> call_to_cursor_context(strip_spaces(rest, spaces + 1))
-      # A local arity definition
-      [?/ | rest] -> arity_to_cursor_context(strip_spaces(rest, spaces + 1))
-      # Starting a new expression
-      [h | _] when h in @starter_punctuation -> {:expr, 0}
-      # It is a local or remote call without parens
-      rest when spaces > 0 -> call_to_cursor_context({rest, spaces})
-      # It is an identifier
-      _ -> identifier_to_cursor_context(reverse, 0, false)
-    end
-  end
-
-  defp strip_spaces([h | rest], count) when h in @space, do: strip_spaces(rest, count + 1)
-  defp strip_spaces(rest, count), do: {rest, count}
-
-  defp unquoted_atom_or_expr(0), do: {{:unquoted_atom, ''}, 1}
-  defp unquoted_atom_or_expr(_), do: {:expr, 0}
-
-  defp arity_to_cursor_context({reverse, spaces}) do
-    case identifier_to_cursor_context(reverse, spaces, true) do
-      {{:local_or_var, acc}, count} -> {{:local_arity, acc}, count}
-      {{:dot, base, acc}, count} -> {{:dot_arity, base, acc}, count}
-      {{:operator, acc}, count} -> {{:operator_arity, acc}, count}
-      {_, _} -> {:none, 0}
-    end
-  end
-
-  defp call_to_cursor_context({reverse, spaces}) do
-    case identifier_to_cursor_context(reverse, spaces, true) do
-      {{:local_or_var, acc}, count} -> {{:local_call, acc}, count}
-      {{:dot, base, acc}, count} -> {{:dot_call, base, acc}, count}
-      {{:operator, acc}, count} -> {{:operator_call, acc}, count}
-      {_, _} -> {:none, 0}
-    end
-  end
-
-  defp identifier_to_cursor_context([?., ?., ?: | _], n, _), do: {{:unquoted_atom, '..'}, n + 3}
-  defp identifier_to_cursor_context([?., ?., ?. | _], n, _), do: {{:local_or_var, '...'}, n + 3}
-  defp identifier_to_cursor_context([?., ?: | _], n, _), do: {{:unquoted_atom, '.'}, n + 2}
-  defp identifier_to_cursor_context([?., ?. | _], n, _), do: {{:operator, '..'}, n + 2}
-
-  defp identifier_to_cursor_context(reverse, count, call_op?) do
-    case identifier(reverse, count) do
-      :none ->
-        {:none, 0}
-
-      :operator ->
-        operator(reverse, count, [], call_op?)
-
-      {:module_attribute, acc, count} ->
-        {{:module_attribute, acc}, count}
-
-      {:sigil, acc, count} ->
-        {{:sigil, acc}, count}
-
-      {:unquoted_atom, acc, count} ->
-        {{:unquoted_atom, acc}, count}
-
-      {:alias, rest, acc, count} ->
-        case strip_spaces(rest, count) do
-          {'.' ++ rest, count} when rest == [] or hd(rest) != ?. ->
-            nested_alias(rest, count + 1, acc)
-
-          {'%' ++ _, count} ->
-            {{:struct, acc}, count + 1}
-
-          _ ->
-            {{:alias, acc}, count}
-        end
-
-      {:identifier, _, acc, count} when call_op? and acc in @textual_operators ->
-        {{:operator, acc}, count}
-
-      {:identifier, rest, acc, count} ->
-        case strip_spaces(rest, count) do
-          {'.' ++ rest, count} when rest == [] or hd(rest) != ?. ->
-            dot(rest, count + 1, acc)
-
-          _ ->
-            {{:local_or_var, acc}, count}
-        end
-    end
-  end
-
-  defp identifier([?? | rest], count), do: check_identifier(rest, count + 1, [??])
-  defp identifier([?! | rest], count), do: check_identifier(rest, count + 1, [?!])
-  defp identifier(rest, count), do: check_identifier(rest, count, [])
-
-  defp check_identifier([h | t], count, acc) when h not in @non_identifier,
-    do: rest_identifier(t, count + 1, [h | acc])
-
-  defp check_identifier(_, _, _), do: :operator
-
-  defp rest_identifier([h | rest], count, acc) when h not in @non_identifier do
-    rest_identifier(rest, count + 1, [h | acc])
-  end
-
-  defp rest_identifier(rest, count, [?@ | acc]) do
-    case tokenize_identifier(rest, count, acc) do
-      {:identifier, _rest, acc, count} -> {:module_attribute, acc, count}
-      :none when acc == [] -> {:module_attribute, '', count}
-      _ -> :none
-    end
-  end
-
-  defp rest_identifier([?~ | rest], count, [letter])
-       when (letter in ?A..?Z or letter in ?a..?z) and
-              (rest == [] or hd(rest) not in @tilde_op_prefix) do
-    {:sigil, [letter], count + 1}
-  end
-
-  defp rest_identifier([?: | rest], count, acc) when rest == [] or hd(rest) != ?: do
-    case String.Tokenizer.tokenize(acc) do
-      {_, _, [], _, _, _} -> {:unquoted_atom, acc, count + 1}
-      _ -> :none
-    end
-  end
-
-  defp rest_identifier([?? | _], _count, _acc) do
-    :none
-  end
-
-  defp rest_identifier(rest, count, acc) do
-    tokenize_identifier(rest, count, acc)
-  end
-
-  defp tokenize_identifier(rest, count, acc) do
-    case String.Tokenizer.tokenize(acc) do
-      # Not actually an atom cause rest is not a :
-      {:atom, _, _, _, _, _} ->
-        :none
-
-      # Aliases must be ascii only
-      {:alias, _, _, _, false, _} ->
-        :none
-
-      {kind, _, [], _, _, extra} ->
-        if ?@ in extra do
-          :none
-        else
-          {kind, rest, acc, count}
-        end
-
-      _ ->
-        :none
-    end
-  end
-
-  defp nested_alias(rest, count, acc) do
-    {rest, count} = strip_spaces(rest, count)
-
-    case identifier_to_cursor_context(rest, count, true) do
-      {{:struct, prev}, count} -> {{:struct, prev ++ '.' ++ acc}, count}
-      {{:alias, prev}, count} -> {{:alias, prev ++ '.' ++ acc}, count}
-      _ -> {:none, 0}
-    end
-  end
-
-  defp dot(rest, count, acc) do
-    {rest, count} = strip_spaces(rest, count)
-
-    case identifier_to_cursor_context(rest, count, true) do
-      {{:local_or_var, var}, count} -> {{:dot, {:var, var}, acc}, count}
-      {{:unquoted_atom, _} = prev, count} -> {{:dot, prev, acc}, count}
-      {{:alias, _} = prev, count} -> {{:dot, prev, acc}, count}
-      {{:dot, _, _} = prev, count} -> {{:dot, prev, acc}, count}
-      {{:module_attribute, _} = prev, count} -> {{:dot, prev, acc}, count}
-      {{:struct, acc}, count} -> {{:struct, acc ++ '.'}, count}
-      {_, _} -> {:none, 0}
-    end
-  end
-
-  defp operator([h | rest], count, acc, call_op?) when h in @operators do
-    operator(rest, count + 1, [h | acc], call_op?)
-  end
-
-  defp operator(rest, count, acc, call_op?) when acc in @incomplete_operators do
-    {rest, dot_count} = strip_spaces(rest, count)
-
-    cond do
-      call_op? ->
-        {:none, 0}
-
-      match?([?. | rest] when rest == [] or hd(rest) != ?., rest) ->
-        dot(tl(rest), dot_count + 1, acc)
-
-      acc == '~' ->
-        {{:sigil, ''}, count}
-
-      true ->
-        {{:operator, acc}, count}
-    end
-  end
-
-  # If we are opening a sigil, ignore the operator.
-  defp operator([letter, ?~ | rest], _count, [op], _call_op?)
-       when op in '<|/' and (letter in ?A..?Z or letter in ?a..?z) and
-              (rest == [] or hd(rest) not in @tilde_op_prefix) do
-    {:none, 0}
-  end
-
-  defp operator(rest, count, acc, _call_op?) do
-    case :elixir_tokenizer.tokenize(acc, 1, 1, []) do
-      {:ok, _, _, _, [{:atom, _, _}]} ->
-        {{:unquoted_atom, tl(acc)}, count}
-
-      {:ok, _, _, _, [{_, _, op}]} ->
-        {rest, dot_count} = strip_spaces(rest, count)
-
-        cond do
-          Code.Identifier.unary_op(op) == :error and Code.Identifier.binary_op(op) == :error ->
-            :none
-
-          match?([?. | rest] when rest == [] or hd(rest) != ?., rest) ->
-            dot(tl(rest), dot_count + 1, acc)
-
-          true ->
-            {{:operator, acc}, count}
-        end
-
-      _ ->
-        {:none, 0}
-    end
-  end
-
-  @doc """
-  Receives a string and returns the surround context.
-
-  This function receives a string with an Elixir code fragment
-  and a `position`. It returns a map containing the beginning
-  and ending of the identifier alongside its context, or `:none`
-  if there is nothing with a known context.
-
-  The difference between `cursor_context/2` and `surround_context/3`
-  is that the former assumes the expression in the code fragment
-  is incomplete. For example, `do` in `cursor_context/2` may be
-  a keyword or a variable or a local call, while `surround_context/3`
-  assumes the expression in the code fragment is complete, therefore
-  `do` would always be a keyword.
-
-  The `position` contains both the `line` and `column`, both starting
-  with the index of 1. The column must precede the surrounding expression.
-  For example, the expression `foo`, will return something for the columns
-  1, 2, and 3, but not 4:
-
-      foo
-      ^ column 1
-
-      foo
-       ^ column 2
-
-      foo
-        ^ column 3
-
-      foo
-         ^ column 4
-
-  The returned map contains the column the expression starts and the
-  first column after the expression ends.
-
-  Similar to `cursor_context/2`, this function also provides a best-effort
-  detection and may not be accurate under all circumstances. See the
-  "Return values" and "Limitations" section under `cursor_context/2` for
-  more information.
-
-  ## Examples
-
-      iex> Code.Fragment.surround_context("foo", {1, 1})
-      %{begin: {1, 1}, context: {:local_or_var, 'foo'}, end: {1, 4}}
-
-  ## Differences to `cursor_context/2`
-
-  Because `surround_context/3` deals with complete code, it has some
-  difference to `cursor_context/2`:
-
-    * `dot_call`/`dot_arity` and `operator_call`/`operator_arity`
-      are collapsed into `dot` and `operator` contexts respectively
-      as there aren't any meaningful distinctions between them
-
-    * On the other hand, this function still makes a distinction between
-      `local_call`/`local_arity` and `local_or_var`, since the latter can
-      be a local or variable
-
-    * `@` when not followed by any identifier is returned as `{:operator, '@'}`
-      (in contrast to `{:module_attribute, ''}` in `cursor_context/2`
-
-    * This function never returns empty sigils `{:sigil, ''}` or empty structs
-      `{:struct, ''}` as context
-  """
-  @doc since: "1.13.0"
-  @spec surround_context(List.Chars.t(), position(), keyword()) ::
-          %{begin: position, end: position, context: context} | :none
-        when context:
-               {:alias, charlist}
-               | {:dot, inside_dot, charlist}
-               | {:local_or_var, charlist}
-               | {:local_arity, charlist}
-               | {:local_call, charlist}
-               | {:module_attribute, charlist}
-               | {:operator, charlist}
-               | {:unquoted_atom, charlist},
-             inside_dot:
-               {:alias, charlist}
-               | {:dot, inside_dot, charlist}
-               | {:module_attribute, charlist}
-               | {:unquoted_atom, charlist}
-               | {:var, charlist}
-  def surround_context(fragment, position, options \\ [])
-
-  def surround_context(binary, {line, column}, opts) when is_binary(binary) do
-    binary
-    |> String.split("\n")
-    |> Enum.at(line - 1, '')
-    |> String.to_charlist()
-    |> position_surround_context(line, column, opts)
-  end
-
-  def surround_context(charlist, {line, column}, opts) when is_list(charlist) do
-    charlist
-    |> :string.split('\n', :all)
-    |> Enum.at(line - 1, '')
-    |> position_surround_context(line, column, opts)
-  end
-
-  def surround_context(other, {_, _} = position, opts) do
-    surround_context(to_charlist(other), position, opts)
-  end
-
-  defp position_surround_context(charlist, line, column, opts)
-       when is_integer(line) and line >= 1 and is_integer(column) and column >= 1 do
-    {reversed_pre, post} = string_reverse_at(charlist, column - 1, [])
-    {reversed_pre, post} = adjust_position(reversed_pre, post)
-
-    case take_identifier(post, []) do
-      {_, [], _} ->
-        maybe_operator(reversed_pre, post, line, opts)
-
-      {:identifier, reversed_post, rest} ->
-        {rest, _} = strip_spaces(rest, 0)
-        reversed = reversed_post ++ reversed_pre
-
-        case codepoint_cursor_context(reversed, opts) do
-          {{:struct, acc}, offset} ->
-            build_surround({:struct, acc}, reversed, line, offset)
-
-          {{:alias, acc}, offset} ->
-            build_surround({:alias, acc}, reversed, line, offset)
-
-          {{:dot, _, [_ | _]} = dot, offset} ->
-            build_surround(dot, reversed, line, offset)
-
-          {{:local_or_var, acc}, offset} when hd(rest) == ?( ->
-            build_surround({:local_call, acc}, reversed, line, offset)
-
-          {{:local_or_var, acc}, offset} when hd(rest) == ?/ ->
-            build_surround({:local_arity, acc}, reversed, line, offset)
-
-          {{:local_or_var, acc}, offset} when acc in @textual_operators ->
-            build_surround({:operator, acc}, reversed, line, offset)
-
-          {{:local_or_var, acc}, offset} when acc not in ~w(do end after else catch rescue)c ->
-            build_surround({:local_or_var, acc}, reversed, line, offset)
-
-          {{:module_attribute, ''}, offset} ->
-            build_surround({:operator, '@'}, reversed, line, offset)
-
-          {{:module_attribute, acc}, offset} ->
-            build_surround({:module_attribute, acc}, reversed, line, offset)
-
-          {{:sigil, acc}, offset} ->
-            build_surround({:sigil, acc}, reversed, line, offset)
-
-          {{:unquoted_atom, acc}, offset} ->
-            build_surround({:unquoted_atom, acc}, reversed, line, offset)
-
-          _ ->
-            maybe_operator(reversed_pre, post, line, opts)
-        end
-
-      {:alias, reversed_post, _rest} ->
-        reversed = reversed_post ++ reversed_pre
-
-        case codepoint_cursor_context(reversed, opts) do
-          {{:alias, acc}, offset} ->
-            build_surround({:alias, acc}, reversed, line, offset)
-
-          {{:struct, acc}, offset} ->
-            build_surround({:struct, acc}, reversed, line, offset)
-
-          _ ->
-            :none
-        end
-    end
-  end
-
-  defp maybe_operator(reversed_pre, post, line, opts) do
-    case take_operator(post, []) do
-      {[], _rest} ->
-        :none
-
-      {reversed_post, rest} ->
-        reversed = reversed_post ++ reversed_pre
-
-        case codepoint_cursor_context(reversed, opts) do
-          {{:operator, acc}, offset} when acc not in @incomplete_operators ->
-            build_surround({:operator, acc}, reversed, line, offset)
-
-          {{:sigil, ''}, offset} when hd(rest) in ?A..?Z or hd(rest) in ?a..?z ->
-            build_surround({:sigil, [hd(rest)]}, [hd(rest) | reversed], line, offset + 1)
-
-          {{:dot, _, [_ | _]} = dot, offset} ->
-            build_surround(dot, reversed, line, offset)
-
-          _ ->
-            :none
-        end
-    end
-  end
-
-  defp build_surround(context, reversed, line, offset) do
-    {post, reversed_pre} = enum_reverse_at(reversed, offset, [])
-    pre = :lists.reverse(reversed_pre)
-    pre_length = :string.length(pre) + 1
-
-    %{
-      context: context,
-      begin: {line, pre_length},
-      end: {line, pre_length + :string.length(post)}
-    }
-  end
-
-  defp take_identifier([h | t], acc) when h in @trailing_identifier,
-    do: {:identifier, [h | acc], t}
-
-  defp take_identifier([h | t], acc) when h not in @non_identifier,
-    do: take_identifier(t, [h | acc])
-
-  defp take_identifier(rest, acc) do
-    with {[?. | t], _} <- strip_spaces(rest, 0),
-         {[h | _], _} when h in ?A..?Z <- strip_spaces(t, 0) do
-      take_alias(rest, acc)
-    else
-      _ -> {:identifier, acc, rest}
-    end
-  end
-
-  defp take_alias([h | t], acc) when h not in @non_identifier,
-    do: take_alias(t, [h | acc])
-
-  defp take_alias(rest, acc) do
-    with {[?. | t], acc} <- move_spaces(rest, acc),
-         {[h | t], acc} when h in ?A..?Z <- move_spaces(t, [?. | acc]) do
-      take_alias(t, [h | acc])
-    else
-      _ -> {:alias, acc, rest}
-    end
-  end
-
-  defp take_operator([h | t], acc) when h in @operators, do: take_operator(t, [h | acc])
-  defp take_operator([h | t], acc) when h == ?., do: take_operator(t, [h | acc])
-  defp take_operator(rest, acc), do: {acc, rest}
-
-  # Unquoted atom handling
-  defp adjust_position(reversed_pre, [?: | post])
-       when hd(post) != ?: and (reversed_pre == [] or hd(reversed_pre) != ?:) do
-    {[?: | reversed_pre], post}
-  end
-
-  defp adjust_position(reversed_pre, [?% | post]) do
-    adjust_position([?% | reversed_pre], post)
-  end
-
-  # Dot/struct handling
-  defp adjust_position(reversed_pre, post) do
-    case move_spaces(post, reversed_pre) do
-      # If we are between spaces and a dot, move past the dot
-      {[?. | post], reversed_pre} when hd(post) != ?. and hd(reversed_pre) != ?. ->
-        {post, reversed_pre} = move_spaces(post, [?. | reversed_pre])
-        {reversed_pre, post}
-
-      _ ->
-        case strip_spaces(reversed_pre, 0) do
-          # If there is a dot to our left, make sure to move to the first character
-          {[?. | rest], _} when rest == [] or hd(rest) not in '.:' ->
-            {post, reversed_pre} = move_spaces(post, reversed_pre)
-            {reversed_pre, post}
-
-          # If there is a % to our left, make sure to move to the first character
-          {[?% | _], _} ->
-            case move_spaces(post, reversed_pre) do
-              {[h | _] = post, reversed_pre} when h in ?A..?Z ->
-                {reversed_pre, post}
-
-              _ ->
-                {reversed_pre, post}
-            end
-
-          _ ->
-            {reversed_pre, post}
-        end
-    end
-  end
-
-  defp move_spaces([h | t], acc) when h in @space, do: move_spaces(t, [h | acc])
-  defp move_spaces(t, acc), do: {t, acc}
-
-  defp string_reverse_at(charlist, 0, acc), do: {acc, charlist}
-
-  defp string_reverse_at(charlist, n, acc) do
-    case :unicode_util.gc(charlist) do
-      [gc | cont] when is_integer(gc) -> string_reverse_at(cont, n - 1, [gc | acc])
-      [gc | cont] when is_list(gc) -> string_reverse_at(cont, n - 1, :lists.reverse(gc, acc))
-      [] -> {acc, []}
-    end
-  end
-
-  defp enum_reverse_at([h | t], n, acc) when n > 0, do: enum_reverse_at(t, n - 1, [h | acc])
-  defp enum_reverse_at(rest, _, acc), do: {acc, rest}
-
-  @doc """
-  Receives a code fragment and returns a quoted expression
-  with a cursor at the nearest argument position.
-
-  A container is any Elixir expression starting with `(`,
-  `{`, and `[`. This includes function calls, tuples, lists,
-  maps, and so on. For example, take this code, which would
-  be given as input:
-
-      max(some_value,
-
-  This function will return the AST equivalent to:
-
-      max(some_value, __cursor__())
-
-  In other words, this function is capable of closing any open
-  brackets and insert the cursor position. Any content at the
-  cursor position that is after a comma or an opening bracket
-  is discarded. For example, if this is given as input:
-
-      max(some_value, another_val
-
-  It will return the same AST:
-
-      max(some_value, __cursor__())
-
-  Similarly, if only this is given:
-
-      max(some_va
-
-  Then it returns:
-
-      max(__cursor__())
-
-  Calls without parenthesis are also supported, as we assume the
-  brackets are implicit.
-
-  Operators and anonymous functions are not containers, and therefore
-  will be discarded. The following will all return the same AST:
-
-      max(some_value,
-      max(some_value, fn x -> x end
-      max(some_value, 1 + another_val
-      max(some_value, 1 |> some_fun() |> another_fun
-
-  On the other hand, tuples, lists, maps, etc all retain the
-  cursor position:
-
-      max(some_value, [1, 2,
-
-  Returns the following AST:
-
-      max(some_value, [1, 2, __cursor__()])
-
-  Keyword lists (and do-end blocks) are also retained. The following:
-
-      if(some_value, do:
-      if(some_value, do: :token
-      if(some_value, do: 1 + val
-
-  all return:
-
-      if(some_value, do: __cursor__())
-
-  The AST returned by this function is not safe to evaluate but
-  it can be analyzed and expanded.
-
-  ## Examples
-
-      iex> Code.Fragment.container_cursor_to_quoted("max(some_value, ")
-      {:ok, {:max, [line: 1], [{:some_value, [line: 1], nil}, {:__cursor__, [line: 1], []}]}}
-
-  ## Options
-
-    * `:file` - the filename to be reported in case of parsing errors.
-      Defaults to `"nofile"`.
-
-    * `:line` - the starting line of the string being parsed.
-      Defaults to 1.
-
-    * `:column` - the starting column of the string being parsed.
-      Defaults to 1.
-
-    * `:columns` - when `true`, attach a `:column` key to the quoted
-      metadata. Defaults to `false`.
-
-    * `:token_metadata` - when `true`, includes token-related
-      metadata in the expression AST, such as metadata for `do` and `end`
-      tokens, for closing tokens, end of expressions, as well as delimiters
-      for sigils. See `t:Macro.metadata/0`. Defaults to `false`.
-
-  """
-  @doc since: "1.13.0"
-  @spec container_cursor_to_quoted(List.Chars.t(), keyword()) ::
-          {:ok, Macro.t()} | {:error, {location :: keyword, binary | {binary, binary}, binary}}
-  def container_cursor_to_quoted(fragment, opts \\ []) do
-    file = Keyword.get(opts, :file, "nofile")
-    line = Keyword.get(opts, :line, 1)
-    column = Keyword.get(opts, :column, 1)
-    columns = Keyword.get(opts, :columns, false)
-    token_metadata = Keyword.get(opts, :token_metadata, false)
-
-    fragment = to_charlist(fragment)
-    tokenizer_opts = [file: file, cursor_completion: true, columns: columns]
-
-    case :elixir_tokenizer.tokenize(fragment, line, column, tokenizer_opts) do
-      {:ok, _, _, _warnings, tokens} ->
-        :elixir.tokens_to_quoted(tokens, file, columns: columns, token_metadata: token_metadata)
-
-      {:error, {line, column, {prefix, suffix}, token}, _rest, _warnings, _so_far} ->
-        location = [line: line, column: column]
-        {:error, {location, {to_string(prefix), to_string(suffix)}, to_string(token)}}
-
-      {:error, {line, column, error, token}, _rest, _warnings, _so_far} ->
-        location = [line: line, column: column]
-        {:error, {location, to_string(error), to_string(token)}}
-    end
-  end
-end
@@ -1,291 +0,0 @@
-defmodule Code.Identifier do
-  @moduledoc false
-
-  @doc """
-  Checks if the given identifier is an unary op.
-
-  ## Examples
-
-      iex> Code.Identifier.unary_op(:+)
-      {:non_associative, 300}
-
-  """
-  @spec unary_op(atom) :: {:non_associative, precedence :: pos_integer} | :error
-  def unary_op(op) do
-    cond do
-      op in [:&] -> {:non_associative, 90}
-      op in [:!, :^, :not, :+, :-, :~~~] -> {:non_associative, 300}
-      op in [:@] -> {:non_associative, 320}
-      true -> :error
-    end
-  end
-
-  @doc """
-  Checks if the given identifier is a binary op.
-
-  ## Examples
-
-      iex> Code.Identifier.binary_op(:+)
-      {:left, 210}
-
-  """
-  @spec binary_op(atom) :: {:left | :right, precedence :: pos_integer} | :error
-  def binary_op(op) do
-    cond do
-      op in [:<-, :\\] -> {:left, 40}
-      op in [:when] -> {:right, 50}
-      op in [:"::"] -> {:right, 60}
-      op in [:|] -> {:right, 70}
-      op in [:=] -> {:right, 100}
-      op in [:||, :|||, :or] -> {:left, 120}
-      op in [:&&, :&&&, :and] -> {:left, 130}
-      op in [:==, :!=, :=~, :===, :!==] -> {:left, 140}
-      op in [:<, :<=, :>=, :>] -> {:left, 150}
-      op in [:|>, :<<<, :>>>, :<~, :~>, :<<~, :~>>, :<~>, :<|>] -> {:left, 160}
-      op in [:in] -> {:left, 170}
-      op in [:^^^] -> {:left, 180}
-      op in [:"//"] -> {:right, 190}
-      op in [:++, :--, :.., :<>, :+++, :---] -> {:right, 200}
-      op in [:+, :-] -> {:left, 210}
-      op in [:*, :/] -> {:left, 220}
-      op in [:**] -> {:left, 230}
-      op in [:.] -> {:left, 310}
-      true -> :error
-    end
-  end
-
-  @doc """
-  Classifies the given atom into one of the following categories:
-
-    * `:alias` - a valid Elixir alias, like `Foo`, `Foo.Bar` and so on
-
-    * `:callable_local` - an atom that can be used as a local call;
-      this category includes identifiers like `:foo`
-
-    * `:callable_operator` - all callable operators, such as `:<>`. Note
-      operators such as `:..` are not callable because of ambiguity
-
-    * `:not_atomable` - callable operators that must be wrapped in quotes when
-      defined as an atom. For example, `::` must be written as `:"::"` to avoid
-      the ambiguity between the atom and the keyword identifier
-
-    * `:not_callable` - an atom that cannot be used as a function call after the
-      `.` operator. Those are typically AST nodes that are special forms (such as
-      `:%{}` and `:<<>>>`) as well as nodes that are ambiguous in calls (such as
-      `:..` and `:...`). This category also includes atoms like `:Foo`, since
-      they are valid identifiers but they need quotes to be used in function
-      calls (`Foo."Bar"`)
-
-    * `:other` - any other atom (these are usually escaped when inspected, like
-      `:"foo and bar"`)
-
-  """
-  def classify(atom) when is_atom(atom) do
-    charlist = Atom.to_charlist(atom)
-
-    cond do
-      atom in [:%, :%{}, :{}, :<<>>, :..., :.., :., :"..//", :->] ->
-        :not_callable
-
-      atom in [:"::", :"//"] ->
-        :not_atomable
-
-      unary_op(atom) != :error or binary_op(atom) != :error ->
-        :callable_operator
-
-      valid_alias?(charlist) ->
-        :alias
-
-      true ->
-        case :elixir_config.identifier_tokenizer().tokenize(charlist) do
-          {kind, _acc, [], _, _, special} ->
-            if kind == :identifier and not :lists.member(?@, special) do
-              :callable_local
-            else
-              :not_callable
-            end
-
-          _ ->
-            :other
-        end
-    end
-  end
-
-  defp valid_alias?('Elixir' ++ rest), do: valid_alias_piece?(rest)
-  defp valid_alias?(_other), do: false
-
-  defp valid_alias_piece?([?., char | rest]) when char >= ?A and char <= ?Z,
-    do: valid_alias_piece?(trim_leading_while_valid_identifier(rest))
-
-  defp valid_alias_piece?([]), do: true
-  defp valid_alias_piece?(_other), do: false
-
-  defp trim_leading_while_valid_identifier([char | rest])
-       when char >= ?a and char <= ?z
-       when char >= ?A and char <= ?Z
-       when char >= ?0 and char <= ?9
-       when char == ?_ do
-    trim_leading_while_valid_identifier(rest)
-  end
-
-  defp trim_leading_while_valid_identifier(other) do
-    other
-  end
-
-  @doc """
-  Inspects the identifier as an atom.
-  """
-  def inspect_as_atom(atom) when is_nil(atom) or is_boolean(atom) do
-    Atom.to_string(atom)
-  end
-
-  def inspect_as_atom(atom) when is_atom(atom) do
-    binary = Atom.to_string(atom)
-
-    case classify(atom) do
-      :alias ->
-        case binary do
-          binary when binary in ["Elixir", "Elixir.Elixir"] -> binary
-          "Elixir.Elixir." <> _rest -> binary
-          "Elixir." <> rest -> rest
-        end
-
-      type when type in [:callable_local, :callable_operator, :not_callable] ->
-        ":" <> binary
-
-      _ ->
-        {escaped, _} = escape(binary, ?")
-        IO.iodata_to_binary([?:, ?", escaped, ?"])
-    end
-  end
-
-  @doc """
-  Inspects the given identifier as a key.
-  """
-  def inspect_as_key(atom) when is_atom(atom) do
-    binary = Atom.to_string(atom)
-
-    case classify(atom) do
-      type when type in [:callable_local, :callable_operator, :not_callable] ->
-        IO.iodata_to_binary([binary, ?:])
-
-      _ ->
-        {escaped, _} = escape(binary, ?")
-        IO.iodata_to_binary([?", escaped, ?", ?:])
-    end
-  end
-
-  @doc """
-  Inspects the given identifier as a function name.
-  """
-  def inspect_as_function(atom) when is_atom(atom) do
-    binary = Atom.to_string(atom)
-
-    case classify(atom) do
-      type when type in [:callable_local, :callable_operator, :not_atomable] ->
-        binary
-
-      type ->
-        escaped =
-          if type in [:not_callable, :alias] do
-            binary
-          else
-            elem(escape(binary, ?"), 0)
-          end
-
-        IO.iodata_to_binary([?", escaped, ?"])
-    end
-  end
-
-  @doc """
-  Extracts the name and arity of the parent from the anonymous function identifier.
-  """
-  # Example of this format: -NAME/ARITY-fun-COUNT-
-  def extract_anonymous_fun_parent(atom) when is_atom(atom) do
-    with "-" <> rest <- Atom.to_string(atom),
-         [trailing | reversed] = rest |> String.split("/") |> Enum.reverse(),
-         [arity, _inner, _count, ""] <- String.split(trailing, "-") do
-      {reversed |> Enum.reverse() |> Enum.join("/") |> String.to_atom(), arity}
-    else
-      _ -> :error
-    end
-  end
-
-  @doc """
-  Escapes the given identifier.
-  """
-  def escape(other, char, count \\ :infinity, fun \\ &escape_map/1) do
-    escape(other, char, count, [], fun)
-  end
-
-  defp escape(<<_, _::binary>> = binary, _char, 0, acc, _fun) do
-    {acc, binary}
-  end
-
-  defp escape(<<char, t::binary>>, char, count, acc, fun) do
-    escape(t, char, decrement(count), [acc | [?\\, char]], fun)
-  end
-
-  defp escape(<<?#, ?{, t::binary>>, char, count, acc, fun) do
-    escape(t, char, decrement(count), [acc | '\\\#{'], fun)
-  end
-
-  defp escape(<<h::utf8, t::binary>>, char, count, acc, fun) do
-    escaped = if value = fun.(h), do: value, else: escape_char(h)
-    escape(t, char, decrement(count), [acc | escaped], fun)
-  end
-
-  defp escape(<<a::4, b::4, t::binary>>, char, count, acc, fun) do
-    escape(t, char, decrement(count), [acc | ['\\x', to_hex(a), to_hex(b)]], fun)
-  end
-
-  defp escape(<<>>, _char, _count, acc, _fun) do
-    {acc, <<>>}
-  end
-
-  defp escape_char(0), do: '\\0'
-
-  defp escape_char(65279), do: '\\uFEFF'
-
-  defp escape_char(char)
-       when char in 0x20..0x7E
-       when char in 0xA0..0xD7FF
-       when char in 0xE000..0xFFFD
-       when char in 0x10000..0x10FFFF do
-    <<char::utf8>>
-  end
-
-  defp escape_char(char) when char < 0x100 do
-    <<a::4, b::4>> = <<char::8>>
-    ['\\x', to_hex(a), to_hex(b)]
-  end
-
-  defp escape_char(char) when char < 0x10000 do
-    <<a::4, b::4, c::4, d::4>> = <<char::16>>
-    ['\\x{', to_hex(a), to_hex(b), to_hex(c), to_hex(d), ?}]
-  end
-
-  defp escape_char(char) when char < 0x1000000 do
-    <<a::4, b::4, c::4, d::4, e::4, f::4>> = <<char::24>>
-    ['\\x{', to_hex(a), to_hex(b), to_hex(c), to_hex(d), to_hex(e), to_hex(f), ?}]
-  end
-
-  defp escape_map(?\a), do: '\\a'
-  defp escape_map(?\b), do: '\\b'
-  defp escape_map(?\d), do: '\\d'
-  defp escape_map(?\e), do: '\\e'
-  defp escape_map(?\f), do: '\\f'
-  defp escape_map(?\n), do: '\\n'
-  defp escape_map(?\r), do: '\\r'
-  defp escape_map(?\t), do: '\\t'
-  defp escape_map(?\v), do: '\\v'
-  defp escape_map(?\\), do: '\\\\'
-  defp escape_map(_), do: false
-
-  @compile {:inline, to_hex: 1, decrement: 1}
-  defp to_hex(c) when c in 0..9, do: ?0 + c
-  defp to_hex(c) when c in 10..15, do: ?A + c - 10
-
-  defp decrement(:infinity), do: :infinity
-  defp decrement(counter), do: counter - 1
-end
@@ -1,581 +0,0 @@
-defmodule Code.Normalizer do
-  @moduledoc false
-
-  defguard is_literal(x)
-           when is_integer(x) or
-                  is_float(x) or
-                  is_binary(x) or
-                  is_atom(x)
-
-  @doc """
-  Wraps literals in the quoted expression to conform to the AST format expected
-  by the formatter.
-  """
-  def normalize(quoted, opts \\ []) do
-    line = Keyword.get(opts, :line, nil)
-    escape = Keyword.get(opts, :escape, true)
-    locals_without_parens = Keyword.get(opts, :locals_without_parens, [])
-
-    state = %{
-      escape: escape,
-      parent_meta: [line: line],
-      locals_without_parens: locals_without_parens ++ Code.Formatter.locals_without_parens()
-    }
-
-    do_normalize(quoted, state)
-  end
-
-  # Wrapped literals should receive the block meta
-  defp do_normalize({:__block__, meta, [literal]}, state)
-       when not is_tuple(literal) or tuple_size(literal) == 2 do
-    normalize_literal(literal, meta, state)
-  end
-
-  # Only normalize the first argument of an alias if it's not an atom
-  defp do_normalize({:__aliases__, meta, [first | rest]}, state) when not is_atom(first) do
-    meta = patch_meta_line(meta, state.parent_meta)
-    first = do_normalize(first, %{state | parent_meta: meta})
-    {:__aliases__, meta, [first | rest]}
-  end
-
-  defp do_normalize({:__aliases__, _, _} = quoted, _state) do
-    quoted
-  end
-
-  # Skip captured arguments like &1
-  defp do_normalize({:&, meta, [term]}, state) when is_integer(term) do
-    meta = patch_meta_line(meta, state.parent_meta)
-    {:&, meta, [term]}
-  end
-
-  # Ranges
-  defp do_normalize(left..right//step, state) do
-    left = do_normalize(left, state)
-    right = do_normalize(right, state)
-    meta = meta_line(state)
-
-    if step == 1 do
-      {:.., meta, [left, right]}
-    else
-      step = do_normalize(step, state)
-      {:"..//", meta, [left, right, step]}
-    end
-  end
-
-  # Bit containers
-  defp do_normalize({:<<>>, _, args} = quoted, state) when is_list(args) do
-    normalize_bitstring(quoted, state)
-  end
-
-  # Atoms with interpolations
-  defp do_normalize(
-         {{:., dot_meta, [:erlang, :binary_to_atom]}, call_meta,
-          [{:<<>>, _, args} = string, :utf8]},
-         state
-       )
-       when is_list(args) do
-    dot_meta = patch_meta_line(dot_meta, state.parent_meta)
-    call_meta = patch_meta_line(call_meta, dot_meta)
-
-    string =
-      if state.escape do
-        normalize_bitstring(string, state, true)
-      else
-        normalize_bitstring(string, state)
-      end
-
-    {{:., dot_meta, [:erlang, :binary_to_atom]}, call_meta, [string, :utf8]}
-  end
-
-  # Charlists with interpolations
-  defp do_normalize({{:., dot_meta, [List, :to_charlist]}, call_meta, [parts]}, state) do
-    parts =
-      Enum.map(parts, fn
-        {{:., part_dot_meta, [Kernel, :to_string]}, part_call_meta, args} ->
-          args = normalize_args(args, state)
-
-          {{:., part_dot_meta, [Kernel, :to_string]}, part_call_meta, args}
-
-        part ->
-          if state.escape do
-            maybe_escape_literal(part, state)
-          else
-            part
-          end
-      end)
-
-    {{:., dot_meta, [List, :to_charlist]}, call_meta, [parts]}
-  end
-
-  # Don't normalize the `Access` atom in access syntax
-  defp do_normalize({:., meta, [Access, :get]}, state) do
-    meta = patch_meta_line(meta, state.parent_meta)
-    {:., meta, [Access, :get]}
-  end
-
-  # Only normalize the left side of the dot operator
-  # The right hand side is an atom in the AST but it's not an atom literal, so
-  # it should not be wrapped
-  defp do_normalize({:., meta, [left, right]}, state) do
-    meta = patch_meta_line(meta, state.parent_meta)
-
-    left = do_normalize(left, %{state | parent_meta: meta})
-
-    {:., meta, [left, right]}
-  end
-
-  # A list of left to right arrows is not considered as a list literal, so it's not wrapped
-  defp do_normalize([{:->, _, [_ | _]} | _] = quoted, state) do
-    normalize_args(quoted, state)
-  end
-
-  # left -> right
-  defp do_normalize({:->, meta, [left, right]}, state) do
-    meta = patch_meta_line(meta, state.parent_meta)
-
-    left = normalize_args(left, %{state | parent_meta: meta})
-    right = do_normalize(right, %{state | parent_meta: meta})
-    {:->, meta, [left, right]}
-  end
-
-  # Maps
-  defp do_normalize({:%{}, meta, args}, state) when is_list(args) do
-    meta =
-      if meta == [] do
-        line = state.parent_meta[:line]
-        [line: line, closing: [line: line]]
-      else
-        meta
-      end
-
-    state = %{state | parent_meta: meta}
-
-    args =
-      case args do
-        [{:|, pipe_meta, [left, right]}] ->
-          left = do_normalize(left, state)
-          right = normalize_map_args(right, state)
-          [{:|, pipe_meta, [left, right]}]
-
-        [{_, _, _} = call] ->
-          [do_normalize(call, state)]
-
-        args ->
-          normalize_map_args(args, state)
-      end
-
-    {:%{}, meta, args}
-  end
-
-  # Sigils
-  defp do_normalize({sigil, meta, [{:<<>>, _, args} = string, modifiers]} = quoted, state)
-       when is_list(args) and is_atom(sigil) do
-    case Atom.to_string(sigil) do
-      <<"sigil_", _name>> ->
-        meta =
-          meta
-          |> patch_meta_line(state.parent_meta)
-          |> Keyword.put_new(:delimiter, "\"")
-
-        {sigil, meta, [do_normalize(string, %{state | parent_meta: meta}), modifiers]}
-
-      _ ->
-        normalize_call(quoted, state)
-    end
-  end
-
-  # Tuples
-  defp do_normalize({:{}, meta, args} = quoted, state) when is_list(args) do
-    {last_arg, args} = List.pop_at(args, -1)
-
-    if args != [] and match?([_ | _], last_arg) and keyword?(last_arg) do
-      args = normalize_args(args, state)
-      kw_list = normalize_kw_args(last_arg, state, true)
-      {:{}, meta, args ++ kw_list}
-    else
-      normalize_call(quoted, state)
-    end
-  end
-
-  # Module attributes
-  defp do_normalize({:@, meta, [{name, name_meta, [value]}]}, state) do
-    value =
-      cond do
-        keyword?(value) ->
-          normalize_kw_args(value, state, true)
-
-        is_list(value) ->
-          normalize_literal(value, meta, state)
-
-        true ->
-          do_normalize(value, state)
-      end
-
-    {:@, meta, [{name, name_meta, [value]}]}
-  end
-
-  # Regular blocks
-  defp do_normalize({:__block__, meta, args}, state) when is_list(args) do
-    {:__block__, meta, normalize_args(args, state)}
-  end
-
-  # Calls
-  defp do_normalize({_, _, args} = quoted, state) when is_list(args) do
-    normalize_call(quoted, state)
-  end
-
-  # Vars
-  defp do_normalize({_, _, context} = quoted, _state) when is_atom(context) do
-    quoted
-  end
-
-  # Literals
-  defp do_normalize(quoted, state) do
-    normalize_literal(quoted, [], state)
-  end
-
-  # Numbers
-  defp normalize_literal(number, meta, state) when is_number(number) do
-    meta =
-      meta
-      |> Keyword.put_new(:token, inspect(number))
-      |> patch_meta_line(state.parent_meta)
-
-    {:__block__, meta, [number]}
-  end
-
-  # Atom, Strings
-  defp normalize_literal(literal, meta, state) when is_atom(literal) or is_binary(literal) do
-    meta = patch_meta_line(meta, state.parent_meta)
-    literal = maybe_escape_literal(literal, state)
-
-    if is_atom(literal) and Code.Identifier.classify(literal) == :alias and
-         is_nil(meta[:delimiter]) do
-      "Elixir." <> segments = Atom.to_string(literal)
-
-      segments =
-        segments
-        |> String.split(".")
-        |> Enum.map(&String.to_atom/1)
-
-      {:__aliases__, meta, segments}
-    else
-      {:__block__, meta, [literal]}
-    end
-  end
-
-  # 2-tuples
-  defp normalize_literal({left, right}, meta, state) do
-    meta = patch_meta_line(meta, state.parent_meta)
-    state = %{state | parent_meta: meta}
-
-    if match?([_ | _], right) and keyword?(right) do
-      {:__block__, meta, [{do_normalize(left, state), normalize_kw_args(right, state, true)}]}
-    else
-      {:__block__, meta, [{do_normalize(left, state), do_normalize(right, state)}]}
-    end
-  end
-
-  # Lists
-  defp normalize_literal(list, meta, state) when is_list(list) do
-    if list != [] and List.ascii_printable?(list) do
-      # It's a charlist
-      list =
-        if state.escape do
-          {string, _} = Code.Identifier.escape(IO.chardata_to_string(list), -1)
-          IO.iodata_to_binary(string) |> to_charlist()
-        else
-          list
-        end
-
-      meta =
-        meta
-        |> Keyword.put_new(:delimiter, "'")
-        |> patch_meta_line(state.parent_meta)
-
-      {:__block__, meta, [list]}
-    else
-      meta =
-        if line = state.parent_meta[:line] do
-          meta
-          |> Keyword.put_new(:closing, line: line)
-          |> patch_meta_line(state.parent_meta)
-        else
-          meta
-        end
-
-      {:__block__, meta, [normalize_kw_args(list, state, false)]}
-    end
-  end
-
-  # Probably an invalid value, wrap it and send it upstream
-  defp normalize_literal(quoted, meta, _state) do
-    {:__block__, meta, [quoted]}
-  end
-
-  defp normalize_call({form, meta, args}, state) do
-    meta = patch_meta_line(meta, state.parent_meta)
-    arity = length(args)
-
-    # Only normalize the form if it's a qualified call
-    form =
-      if is_atom(form) do
-        form
-      else
-        do_normalize(form, %{state | parent_meta: meta})
-      end
-
-    meta =
-      if is_nil(meta[:no_parens]) and is_nil(meta[:closing]) and is_nil(meta[:do]) and
-           not Code.Formatter.local_without_parens?(form, arity, state.locals_without_parens) do
-        [closing: [line: meta[:line]]] ++ meta
-      else
-        meta
-      end
-
-    cond do
-      Keyword.has_key?(meta, :do) or match?([{{:__block__, _, [:do]}, _} | _], List.last(args)) ->
-        # def foo do :ok end
-        # def foo, do: :ok
-        normalize_kw_blocks(form, meta, args, state)
-
-      match?([{:do, _} | _], List.last(args)) ->
-        # Non normalized kw blocks
-        line = state.parent_meta[:line]
-        meta = meta ++ [do: [line: line], end: [line: line]]
-        normalize_kw_blocks(form, meta, args, state)
-
-      allow_keyword?(form, arity) ->
-        args = normalize_args(args, %{state | parent_meta: state.parent_meta})
-        {last_arg, leading_args} = List.pop_at(args, -1, [])
-
-        last_args =
-          case last_arg do
-            {:__block__, _, [[{{:__block__, key_meta, _}, _} | _]] = last_args} ->
-              if key_meta[:format] == :keyword do
-                last_args
-              else
-                [last_arg]
-              end
-
-            [] ->
-              []
-
-            _ ->
-              [last_arg]
-          end
-
-        {form, meta, leading_args ++ last_args}
-
-      true ->
-        args = normalize_args(args, %{state | parent_meta: state.parent_meta})
-        {form, meta, args}
-    end
-  end
-
-  defp allow_keyword?(:when, 2), do: true
-  defp allow_keyword?(:{}, _), do: false
-  defp allow_keyword?(op, arity), do: not is_atom(op) or not Macro.operator?(op, arity)
-
-  defp normalize_bitstring({:<<>>, meta, parts} = quoted, state, escape_interpolation \\ false) do
-    meta = patch_meta_line(meta, state.parent_meta)
-
-    parts =
-      if interpolated?(quoted) do
-        normalize_interpolation_parts(parts, %{state | parent_meta: meta}, escape_interpolation)
-      else
-        state = %{state | parent_meta: meta}
-
-        Enum.map(parts, fn part ->
-          with {:"::", meta, [left, _]} <- part,
-               true <- meta[:inferred_bitstring_spec] do
-            do_normalize(left, state)
-          else
-            _ -> do_normalize(part, state)
-          end
-        end)
-      end
-
-    {:<<>>, meta, parts}
-  end
-
-  defp normalize_interpolation_parts(parts, state, escape_interpolation) do
-    Enum.map(parts, fn
-      {:"::", interpolation_meta,
-       [
-         {{:., dot_meta, [Kernel, :to_string]}, middle_meta, [middle]},
-         {:binary, binary_meta, context}
-       ]} ->
-        middle = do_normalize(middle, %{state | parent_meta: dot_meta})
-
-        {:"::", interpolation_meta,
-         [
-           {{:., dot_meta, [Kernel, :to_string]}, middle_meta, [middle]},
-           {:binary, binary_meta, context}
-         ]}
-
-      part ->
-        if escape_interpolation do
-          maybe_escape_literal(part, state)
-        else
-          part
-        end
-    end)
-  end
-
-  defp normalize_map_args(args, state) do
-    Enum.map(normalize_kw_args(args, state, false), fn
-      {:__block__, _, [{_, _} = pair]} -> pair
-      pair -> pair
-    end)
-  end
-
-  defp normalize_kw_blocks(form, meta, args, state) do
-    {kw_blocks, leading_args} = List.pop_at(args, -1)
-
-    kw_blocks =
-      Enum.map(kw_blocks, fn {tag, block} ->
-        block = do_normalize(block, %{state | parent_meta: meta})
-
-        block =
-          case block do
-            {_, _, [[{:->, _, _} | _] = block]} -> block
-            block -> block
-          end
-
-        # Only wrap the tag if it isn't already wrapped
-        tag =
-          case tag do
-            {:__block__, _, _} -> tag
-            _ -> {:__block__, [line: meta[:line]], [tag]}
-          end
-
-        {tag, block}
-      end)
-
-    leading_args = normalize_args(leading_args, %{state | parent_meta: meta})
-    {form, meta, leading_args ++ [kw_blocks]}
-  end
-
-  defp normalize_kw_args(elems, state, keyword?)
-
-  defp normalize_kw_args(
-         [{{:__block__, key_meta, [key]}, value} = first | rest] = current,
-         state,
-         keyword?
-       )
-       when is_atom(key) do
-    keyword? = keyword? or keyword?(current)
-
-    first =
-      if key_meta[:format] == :keyword and not keyword? do
-        key_meta = Keyword.delete(key_meta, :format)
-        line = key_meta[:line] || meta_line(state)
-        {:__block__, [line: line], [{{:__block__, key_meta, [key]}, value}]}
-      else
-        first
-      end
-
-    [first | normalize_kw_args(rest, state, keyword?)]
-  end
-
-  defp normalize_kw_args([{left, right} | rest] = current, state, keyword?) do
-    keyword? = keyword? or keyword?(current)
-
-    left =
-      if keyword? do
-        meta = [format: :keyword] ++ meta_line(state)
-        {:__block__, meta, [maybe_escape_literal(left, state)]}
-      else
-        do_normalize(left, state)
-      end
-
-    right = do_normalize(right, state)
-
-    pair =
-      with {:__block__, meta, _} <- left,
-           :keyword <- meta[:format] do
-        {left, right}
-      else
-        _ -> {:__block__, meta_line(state), [{left, right}]}
-      end
-
-    [pair | normalize_kw_args(rest, state, keyword?)]
-  end
-
-  defp normalize_kw_args([first | rest], state, keyword?) do
-    [do_normalize(first, state) | normalize_kw_args(rest, state, keyword?)]
-  end
-
-  defp normalize_kw_args([], _state, _keyword?) do
-    []
-  end
-
-  defp normalize_args(args, state) do
-    Enum.map(args, &do_normalize(&1, state))
-  end
-
-  defp maybe_escape_literal(string, %{escape: true}) when is_binary(string) do
-    {string, _} = Code.Identifier.escape(string, -1)
-    IO.iodata_to_binary(string)
-  end
-
-  defp maybe_escape_literal(atom, %{escape: true} = state) when is_atom(atom) do
-    atom
-    |> Atom.to_string()
-    |> maybe_escape_literal(state)
-    |> String.to_atom()
-  end
-
-  defp maybe_escape_literal(term, _) do
-    term
-  end
-
-  # Check if we have an interpolated string.
-  defp interpolated?({:<<>>, _, [_ | _] = parts}) do
-    Enum.all?(parts, fn
-      {:"::", _, [{{:., _, [Kernel, :to_string]}, _, [_]}, {:binary, _, _}]} -> true
-      binary when is_binary(binary) -> true
-      _ -> false
-    end)
-  end
-
-  defp interpolated?(_) do
-    false
-  end
-
-  defp patch_meta_line(meta, parent_meta) do
-    with nil <- meta[:line],
-         line when is_integer(line) <- parent_meta[:line] do
-      [line: line] ++ meta
-    else
-      _ -> meta
-    end
-  end
-
-  defp meta_line(state) do
-    if line = state.parent_meta[:line] do
-      [line: line]
-    else
-      []
-    end
-  end
-
-  defp keyword?([{{:__block__, key_meta, [key]}, _} | rest]) when is_atom(key) do
-    if key_meta[:format] == :keyword do
-      keyword?(rest)
-    else
-      false
-    end
-  end
-
-  defp keyword?([{key, _value} | rest]) when is_atom(key) do
-    case Atom.to_charlist(key) do
-      'Elixir.' ++ _ -> false
-      _ -> keyword?(rest)
-    end
-  end
-
-  defp keyword?([]), do: true
-  defp keyword?(_other), do: false
-end
@@ -1,421 +0,0 @@
-defmodule Code.Typespec do
-  @moduledoc false
-
-  @doc """
-  Converts a spec clause back to Elixir quoted expression.
-  """
-  @spec spec_to_quoted(atom, tuple) :: {atom, keyword, [Macro.t()]}
-  def spec_to_quoted(name, spec)
-
-  def spec_to_quoted(name, {:type, anno, :fun, [{:type, _, :product, args}, result]})
-      when is_atom(name) do
-    meta = meta(anno)
-    body = {name, meta, Enum.map(args, &typespec_to_quoted/1)}
-
-    vars =
-      for type_expr <- args ++ [result],
-          var <- collect_vars(type_expr),
-          uniq: true,
-          do: {var, {:var, meta, nil}}
-
-    spec = {:"::", meta, [body, typespec_to_quoted(result)]}
-
-    if vars == [] do
-      spec
-    else
-      {:when, meta, [spec, vars]}
-    end
-  end
-
-  def spec_to_quoted(name, {:type, anno, :fun, []}) when is_atom(name) do
-    meta = meta(anno)
-    {:"::", meta, [{name, meta, []}, quote(do: term)]}
-  end
-
-  def spec_to_quoted(name, {:type, anno, :bounded_fun, [type, constrs]}) when is_atom(name) do
-    meta = meta(anno)
-    {:type, _, :fun, [{:type, _, :product, args}, result]} = type
-
-    guards =
-      for {:type, _, :constraint, [{:atom, _, :is_subtype}, [{:var, _, var}, type]]} <- constrs do
-        {erl_to_ex_var(var), typespec_to_quoted(type)}
-      end
-
-    ignore_vars = Keyword.keys(guards)
-
-    vars =
-      for type_expr <- args ++ [result],
-          var <- collect_vars(type_expr),
-          var not in ignore_vars,
-          uniq: true,
-          do: {var, {:var, meta, nil}}
-
-    args = for arg <- args, do: typespec_to_quoted(arg)
-
-    when_args = [
-      {:"::", meta, [{name, meta, args}, typespec_to_quoted(result)]},
-      guards ++ vars
-    ]
-
-    {:when, meta, when_args}
-  end
-
-  @doc """
-  Converts a type clause back to Elixir AST.
-  """
-  def type_to_quoted(type)
-
-  def type_to_quoted({{:record, record}, fields, args}) when is_atom(record) do
-    fields = for field <- fields, do: typespec_to_quoted(field)
-    args = for arg <- args, do: typespec_to_quoted(arg)
-    type = {:{}, [], [record | fields]}
-    quote(do: unquote(record)(unquote_splicing(args)) :: unquote(type))
-  end
-
-  def type_to_quoted({name, type, args}) when is_atom(name) do
-    args = for arg <- args, do: typespec_to_quoted(arg)
-    quote(do: unquote(name)(unquote_splicing(args)) :: unquote(typespec_to_quoted(type)))
-  end
-
-  @doc """
-  Returns all types available from the module's BEAM code.
-
-  The result is returned as a list of tuples where the first
-  element is the type (`:typep`, `:type` and `:opaque`).
-
-  The module must have a corresponding BEAM file which can be
-  located by the runtime system. The types will be in the Erlang
-  Abstract Format.
-  """
-  @spec fetch_types(module | binary) :: {:ok, [tuple]} | :error
-  def fetch_types(module) when is_atom(module) or is_binary(module) do
-    case typespecs_abstract_code(module) do
-      {:ok, abstract_code} ->
-        exported_types = for {:attribute, _, :export_type, types} <- abstract_code, do: types
-        exported_types = List.flatten(exported_types)
-
-        types =
-          for {:attribute, _, kind, {name, _, args} = type} <- abstract_code,
-              kind in [:opaque, :type] do
-            cond do
-              kind == :opaque -> {:opaque, type}
-              {name, length(args)} in exported_types -> {:type, type}
-              true -> {:typep, type}
-            end
-          end
-
-        {:ok, types}
-
-      _ ->
-        :error
-    end
-  end
-
-  @doc """
-  Returns all specs available from the module's BEAM code.
-
-  The result is returned as a list of tuples where the first
-  element is spec name and arity and the second is the spec.
-
-  The module must have a corresponding BEAM file which can be
-  located by the runtime system. The types will be in the Erlang
-  Abstract Format.
-  """
-  @spec fetch_specs(module) :: {:ok, [tuple]} | :error
-  def fetch_specs(module) when is_atom(module) or is_binary(module) do
-    case typespecs_abstract_code(module) do
-      {:ok, abstract_code} ->
-        {:ok, for({:attribute, _, :spec, value} <- abstract_code, do: value)}
-
-      :error ->
-        :error
-    end
-  end
-
-  @doc """
-  Returns all callbacks available from the module's BEAM code.
-
-  The result is returned as a list of tuples where the first
-  element is spec name and arity and the second is the spec.
-
-  The module must have a corresponding BEAM file
-  which can be located by the runtime system. The types will be
-  in the Erlang Abstract Format.
-  """
-  @spec fetch_callbacks(module) :: {:ok, [tuple]} | :error
-  def fetch_callbacks(module) when is_atom(module) or is_binary(module) do
-    case typespecs_abstract_code(module) do
-      {:ok, abstract_code} ->
-        {:ok, for({:attribute, _, :callback, value} <- abstract_code, do: value)}
-
-      :error ->
-        :error
-    end
-  end
-
-  defp typespecs_abstract_code(module) do
-    with {module, binary} <- get_module_and_beam(module),
-         {:ok, {_, [debug_info: {:debug_info_v1, backend, data}]}} <-
-           :beam_lib.chunks(binary, [:debug_info]) do
-      case data do
-        {:elixir_v1, %{}, specs} ->
-          # Fast path to avoid translation to Erlang from Elixir.
-          {:ok, specs}
-
-        _ ->
-          case backend.debug_info(:erlang_v1, module, data, []) do
-            {:ok, abstract_code} -> {:ok, abstract_code}
-            _ -> :error
-          end
-      end
-    else
-      _ -> :error
-    end
-  end
-
-  defp get_module_and_beam(module) when is_atom(module) do
-    case :code.get_object_code(module) do
-      {^module, beam, _filename} -> {module, beam}
-      :error -> :error
-    end
-  end
-
-  defp get_module_and_beam(beam) when is_binary(beam) do
-    case :beam_lib.info(beam) do
-      [_ | _] = info -> {info[:module], beam}
-      _ -> :error
-    end
-  end
-
-  ## To AST conversion
-
-  defp collect_vars({:ann_type, _anno, args}) when is_list(args) do
-    []
-  end
-
-  defp collect_vars({:type, _anno, _kind, args}) when is_list(args) do
-    Enum.flat_map(args, &collect_vars/1)
-  end
-
-  defp collect_vars({:remote_type, _anno, args}) when is_list(args) do
-    Enum.flat_map(args, &collect_vars/1)
-  end
-
-  defp collect_vars({:typed_record_field, _anno, type}) do
-    collect_vars(type)
-  end
-
-  defp collect_vars({:paren_type, _anno, [type]}) do
-    collect_vars(type)
-  end
-
-  defp collect_vars({:var, _anno, var}) do
-    [erl_to_ex_var(var)]
-  end
-
-  defp collect_vars(_) do
-    []
-  end
-
-  defp typespec_to_quoted({:user_type, anno, name, args}) do
-    args = for arg <- args, do: typespec_to_quoted(arg)
-    {name, meta(anno), args}
-  end
-
-  defp typespec_to_quoted({:type, anno, :tuple, :any}) do
-    {:tuple, meta(anno), []}
-  end
-
-  defp typespec_to_quoted({:type, anno, :tuple, args}) do
-    args = for arg <- args, do: typespec_to_quoted(arg)
-    {:{}, meta(anno), args}
-  end
-
-  defp typespec_to_quoted({:type, _anno, :list, [{:type, _, :union, unions} = arg]}) do
-    case unpack_typespec_kw(unions, []) do
-      {:ok, ast} -> ast
-      :error -> [typespec_to_quoted(arg)]
-    end
-  end
-
-  defp typespec_to_quoted({:type, anno, :list, []}) do
-    {:list, meta(anno), []}
-  end
-
-  defp typespec_to_quoted({:type, _anno, :list, [arg]}) do
-    [typespec_to_quoted(arg)]
-  end
-
-  defp typespec_to_quoted({:type, anno, :nonempty_list, []}) do
-    [{:..., meta(anno), nil}]
-  end
-
-  defp typespec_to_quoted({:type, anno, :nonempty_list, [arg]}) do
-    [typespec_to_quoted(arg), {:..., meta(anno), nil}]
-  end
-
-  defp typespec_to_quoted({:type, anno, :map, :any}) do
-    {:map, meta(anno), []}
-  end
-
-  defp typespec_to_quoted({:type, anno, :map, fields}) do
-    fields =
-      Enum.map(fields, fn
-        {:type, _, :map_field_assoc, :any} ->
-          {{:optional, [], [{:any, [], []}]}, {:any, [], []}}
-
-        {:type, _, :map_field_exact, [{:atom, _, k}, v]} ->
-          {k, typespec_to_quoted(v)}
-
-        {:type, _, :map_field_exact, [k, v]} ->
-          {{:required, [], [typespec_to_quoted(k)]}, typespec_to_quoted(v)}
-
-        {:type, _, :map_field_assoc, [k, v]} ->
-          {{:optional, [], [typespec_to_quoted(k)]}, typespec_to_quoted(v)}
-      end)
-
-    case List.keytake(fields, :__struct__, 0) do
-      {{:__struct__, struct}, fields_pruned} when is_atom(struct) and struct != nil ->
-        map_pruned = {:%{}, meta(anno), fields_pruned}
-        {:%, meta(anno), [struct, map_pruned]}
-
-      _ ->
-        {:%{}, meta(anno), fields}
-    end
-  end
-
-  defp typespec_to_quoted({:type, anno, :binary, [arg1, arg2]}) do
-    [arg1, arg2] = for arg <- [arg1, arg2], do: typespec_to_quoted(arg)
-    line = meta(anno)[:line]
-
-    case {typespec_to_quoted(arg1), typespec_to_quoted(arg2)} do
-      {arg1, 0} ->
-        quote(line: line, do: <<_::unquote(arg1)>>)
-
-      {0, arg2} ->
-        quote(line: line, do: <<_::_*unquote(arg2)>>)
-
-      {arg1, arg2} ->
-        quote(line: line, do: <<_::unquote(arg1), _::_*unquote(arg2)>>)
-    end
-  end
-
-  defp typespec_to_quoted({:type, anno, :union, args}) do
-    args = for arg <- args, do: typespec_to_quoted(arg)
-    Enum.reduce(Enum.reverse(args), fn arg, expr -> {:|, meta(anno), [arg, expr]} end)
-  end
-
-  defp typespec_to_quoted({:type, anno, :fun, [{:type, _, :product, args}, result]}) do
-    args = for arg <- args, do: typespec_to_quoted(arg)
-    [{:->, meta(anno), [args, typespec_to_quoted(result)]}]
-  end
-
-  defp typespec_to_quoted({:type, anno, :fun, [args, result]}) do
-    [{:->, meta(anno), [[typespec_to_quoted(args)], typespec_to_quoted(result)]}]
-  end
-
-  defp typespec_to_quoted({:type, anno, :fun, []}) do
-    typespec_to_quoted({:type, anno, :fun, [{:type, anno, :any}, {:type, anno, :any, []}]})
-  end
-
-  defp typespec_to_quoted({:type, anno, :range, [left, right]}) do
-    {:.., meta(anno), [typespec_to_quoted(left), typespec_to_quoted(right)]}
-  end
-
-  defp typespec_to_quoted({:type, _anno, nil, []}) do
-    []
-  end
-
-  defp typespec_to_quoted({:type, anno, name, args}) do
-    args = for arg <- args, do: typespec_to_quoted(arg)
-    {name, meta(anno), args}
-  end
-
-  defp typespec_to_quoted({:var, anno, var}) do
-    {erl_to_ex_var(var), meta(anno), nil}
-  end
-
-  defp typespec_to_quoted({:op, anno, op, arg}) do
-    {op, meta(anno), [typespec_to_quoted(arg)]}
-  end
-
-  defp typespec_to_quoted({:remote_type, anno, [mod, name, args]}) do
-    remote_type(anno, mod, name, args)
-  end
-
-  defp typespec_to_quoted({:ann_type, anno, [var, type]}) do
-    {:"::", meta(anno), [typespec_to_quoted(var), typespec_to_quoted(type)]}
-  end
-
-  defp typespec_to_quoted(
-         {:typed_record_field, {:record_field, anno1, {:atom, anno2, name}}, type}
-       ) do
-    typespec_to_quoted({:ann_type, anno1, [{:var, anno2, name}, type]})
-  end
-
-  defp typespec_to_quoted({:type, _, :any}) do
-    quote(do: ...)
-  end
-
-  defp typespec_to_quoted({:paren_type, _, [type]}) do
-    typespec_to_quoted(type)
-  end
-
-  defp typespec_to_quoted({type, _anno, atom}) when is_atom(type) do
-    atom
-  end
-
-  defp typespec_to_quoted(other), do: other
-
-  ## Helpers
-
-  defp remote_type(anno, {:atom, _, :elixir}, {:atom, _, :charlist}, []) do
-    typespec_to_quoted({:type, anno, :charlist, []})
-  end
-
-  defp remote_type(anno, {:atom, _, :elixir}, {:atom, _, :nonempty_charlist}, []) do
-    typespec_to_quoted({:type, anno, :nonempty_charlist, []})
-  end
-
-  defp remote_type(anno, {:atom, _, :elixir}, {:atom, _, :struct}, []) do
-    typespec_to_quoted({:type, anno, :struct, []})
-  end
-
-  defp remote_type(anno, {:atom, _, :elixir}, {:atom, _, :as_boolean}, [arg]) do
-    typespec_to_quoted({:type, anno, :as_boolean, [arg]})
-  end
-
-  defp remote_type(anno, {:atom, _, :elixir}, {:atom, _, :keyword}, args) do
-    typespec_to_quoted({:type, anno, :keyword, args})
-  end
-
-  defp remote_type(anno, mod, name, args) do
-    args = for arg <- args, do: typespec_to_quoted(arg)
-    dot = {:., meta(anno), [typespec_to_quoted(mod), typespec_to_quoted(name)]}
-    {dot, meta(anno), args}
-  end
-
-  defp erl_to_ex_var(var) do
-    case Atom.to_string(var) do
-      <<"_", c::utf8, rest::binary>> ->
-        String.to_atom("_#{String.downcase(<<c::utf8>>)}#{rest}")
-
-      <<c::utf8, rest::binary>> ->
-        String.to_atom("#{String.downcase(<<c::utf8>>)}#{rest}")
-    end
-  end
-
-  defp unpack_typespec_kw([{:type, _, :tuple, [{:atom, _, atom}, type]} | t], acc) do
-    unpack_typespec_kw(t, [{atom, typespec_to_quoted(type)} | acc])
-  end
-
-  defp unpack_typespec_kw([], acc) do
-    {:ok, Enum.reverse(acc)}
-  end
-
-  defp unpack_typespec_kw(_, _acc) do
-    :error
-  end
-
-  defp meta(anno), do: [line: :erl_anno.line(anno)]
-end
@@ -1,179 +0,0 @@
-defprotocol Collectable do
-  @moduledoc """
-  A protocol to traverse data structures.
-
-  The `Enum.into/2` function uses this protocol to insert an
-  enumerable into a collection:
-
-      iex> Enum.into([a: 1, b: 2], %{})
-      %{a: 1, b: 2}
-
-  ## Why Collectable?
-
-  The `Enumerable` protocol is useful to take values out of a collection.
-  In order to support a wide range of values, the functions provided by
-  the `Enumerable` protocol do not keep shape. For example, passing a
-  map to `Enum.map/2` always returns a list.
-
-  This design is intentional. `Enumerable` was designed to support infinite
-  collections, resources and other structures with fixed shape. For example,
-  it doesn't make sense to insert values into a `Range`, as it has a
-  fixed shape where only the range limits and step are stored.
-
-  The `Collectable` module was designed to fill the gap left by the
-  `Enumerable` protocol. `Collectable.into/1` can be seen as the opposite of
-  `Enumerable.reduce/3`. If the functions in `Enumerable` are about taking values out,
-  then `Collectable.into/1` is about collecting those values into a structure.
-
-  ## Examples
-
-  To show how to manually use the `Collectable` protocol, let's play with a
-  simplified implementation for `MapSet`.
-
-      iex> {initial_acc, collector_fun} = Collectable.into(MapSet.new())
-      iex> updated_acc = Enum.reduce([1, 2, 3], initial_acc, fn elem, acc ->
-      ...>   collector_fun.(acc, {:cont, elem})
-      ...> end)
-      iex> collector_fun.(updated_acc, :done)
-      #MapSet<[1, 2, 3]>
-
-  To show how the protocol can be implemented, we can again look at the
-  simplified implementation for `MapSet`. In this implementation "collecting" elements
-  simply means inserting them in the set through `MapSet.put/2`.
-
-      defimpl Collectable, for: MapSet do
-        def into(map_set) do
-          collector_fun = fn
-            map_set_acc, {:cont, elem} ->
-              MapSet.put(map_set_acc, elem)
-
-            map_set_acc, :done ->
-              map_set_acc
-
-            _map_set_acc, :halt ->
-              :ok
-          end
-
-          initial_acc = map_set
-
-          {initial_acc, collector_fun}
-        end
-      end
-
-  So now we can call `Enum.into/2`:
-
-      iex> Enum.into([1, 2, 3], MapSet.new())
-      #MapSet<[1, 2, 3]>
-
-  """
-
-  @type command :: {:cont, term} | :done | :halt
-
-  @doc """
-  Returns an initial accumulator and a "collector" function.
-
-  Receives a `collectable` which can be used as the initial accumulator that will
-  be passed to the function.
-
-  The collector function receives a term and a command and injects the term into
-  the collectable accumulator on every `{:cont, term}` command.
-
-  `:done` is passed as a command when no further values will be injected. This
-  is useful when there's a need to close resources or normalizing values. A
-  collectable must be returned when the command is `:done`.
-
-  If injection is suddenly interrupted, `:halt` is passed and the function
-  can return any value as it won't be used.
-
-  For examples on how to use the `Collectable` protocol and `into/1` see the
-  module documentation.
-  """
-  @spec into(t) :: {initial_acc :: term, collector :: (term, command -> t | term)}
-  def into(collectable)
-end
-
-defimpl Collectable, for: List do
-  def into(list) do
-    # TODO: Change the behaviour so the into always comes last on Elixir v2.0
-    if list != [] do
-      IO.warn(
-        "the Collectable protocol is deprecated for non-empty lists. The behaviour of " <>
-          "Enum.into/2 and \"for\" comprehensions with an :into option is incorrect " <>
-          "when collecting into non-empty lists. If you're collecting into a non-empty keyword " <>
-          "list, consider using Keyword.merge/2 instead. If you're collecting into a non-empty " <>
-          "list, consider concatenating the two lists with the ++ operator."
-      )
-    end
-
-    fun = fn
-      list_acc, {:cont, elem} ->
-        [elem | list_acc]
-
-      list_acc, :done ->
-        list ++ :lists.reverse(list_acc)
-
-      _list_acc, :halt ->
-        :ok
-    end
-
-    {[], fun}
-  end
-end
-
-defimpl Collectable, for: BitString do
-  def into(binary) when is_binary(binary) do
-    fun = fn
-      acc, {:cont, x} when is_binary(x) and is_list(acc) ->
-        [acc | x]
-
-      acc, {:cont, x} when is_bitstring(x) and is_bitstring(acc) ->
-        <<acc::bitstring, x::bitstring>>
-
-      acc, {:cont, x} when is_bitstring(x) ->
-        <<IO.iodata_to_binary(acc)::bitstring, x::bitstring>>
-
-      acc, :done when is_bitstring(acc) ->
-        acc
-
-      acc, :done ->
-        IO.iodata_to_binary(acc)
-
-      __acc, :halt ->
-        :ok
-    end
-
-    {[binary], fun}
-  end
-
-  def into(bitstring) do
-    fun = fn
-      acc, {:cont, x} when is_bitstring(x) ->
-        <<acc::bitstring, x::bitstring>>
-
-      acc, :done ->
-        acc
-
-      _acc, :halt ->
-        :ok
-    end
-
-    {bitstring, fun}
-  end
-end
-
-defimpl Collectable, for: Map do
-  def into(map) do
-    fun = fn
-      map_acc, {:cont, {key, value}} ->
-        Map.put(map_acc, key, value)
-
-      map_acc, :done ->
-        map_acc
-
-      _map_acc, :halt ->
-        :ok
-    end
-
-    {map, fun}
-  end
-end
@@ -1,333 +0,0 @@
-defmodule Config do
-  @moduledoc ~S"""
-  A simple keyword-based configuration API.
-
-  ## Example
-
-  This module is most commonly used to define application configuration,
-  typically in `config/config.exs`:
-
-      import Config
-
-      config :some_app,
-        key1: "value1",
-        key2: "value2"
-
-      import_config "#{config_env()}.exs"
-
-  `import Config` will import the functions `config/2`, `config/3`
-  `config_env/0`, `config_target/0`, and `import_config/1`
-  to help you manage your configuration.
-
-  `config/2` and `config/3` are used to define key-value configuration
-  for a given application. Once Mix starts, it will automatically
-  evaluate the configuration file and persist the configuration above
-  into `:some_app`'s application environment, which can be accessed in
-  as follows:
-
-      "value1" = Application.fetch_env!(:some_app, :key1)
-
-  Finally, the line `import_config "#{config_env()}.exs"` will import
-  other config files based on the current configuration environment,
-  such as `config/dev.exs` and `config/test.exs`.
-
-  `Config` also provides a low-level API for evaluating and reading
-  configuration, under the `Config.Reader` module.
-
-  **Important:** if you are writing a library to be used by other developers,
-  it is generally recommended to avoid the application environment, as the
-  application environment is effectively a global storage. Also note that
-  the `config/config.exs` of a library is not evaluated when the library is
-  used as a dependency, as configuration is always meant to configure the
-  current project. For more information, read our [library guidelines](library-guidelines.md).
-
-  ## Migrating from `use Mix.Config`
-
-  The `Config` module in Elixir was introduced in v1.9 as a replacement to
-  `Mix.Config`, which was specific to Mix and has been deprecated.
-
-  You can leverage `Config` instead of `Mix.Config` in three steps. The first
-  step is to replace `use Mix.Config` at the top of your config files by
-  `import Config`.
-
-  The second is to make sure your `import_config/1` calls do not have a
-  wildcard character. If so, you need to perform the wildcard lookup
-  manually. For example, if you did:
-
-      import_config "../apps/*/config/config.exs"
-
-  It has to be replaced by:
-
-      for config <- "../apps/*/config/config.exs" |> Path.expand(__DIR__) |> Path.wildcard() do
-        import_config config
-      end
-
-  The last step is to replace all `Mix.env()` calls by `config_env()`.
-
-  ## config/runtime.exs
-
-  For runtime configuration, you can use the `config/runtime.exs` file.
-  It is executed right before applications start in both Mix and releases
-  (assembled with `mix release`).
-  """
-
-  @opts_key {__MODULE__, :opts}
-  @config_key {__MODULE__, :config}
-  @imports_key {__MODULE__, :imports}
-
-  defp get_opts!(), do: Process.get(@opts_key) || raise_improper_use!()
-  defp put_opts(value), do: Process.put(@opts_key, value)
-  defp delete_opts(), do: Process.delete(@opts_key)
-
-  defp get_config!(), do: Process.get(@config_key) || raise_improper_use!()
-  defp put_config(value), do: Process.put(@config_key, value)
-  defp delete_config(), do: Process.delete(@config_key)
-
-  defp get_imports!(), do: Process.get(@imports_key) || raise_improper_use!()
-  defp put_imports(value), do: Process.put(@imports_key, value)
-  defp delete_imports(), do: Process.delete(@imports_key)
-
-  defp raise_improper_use!() do
-    raise "could not set configuration via Config. " <>
-            "This usually means you are trying to execute a configuration file " <>
-            "directly, instead of reading it with Config.Reader"
-  end
-
-  @doc """
-  Configures the given `root_key`.
-
-  Keyword lists are always deep-merged.
-
-  ## Examples
-
-  The given `opts` are merged into the existing configuration
-  for the given `root_key`. Conflicting keys are overridden by the
-  ones specified in `opts`, unless they are keywords, which are
-  deep merged recursively. For example, the application configuration
-  below
-
-      config :logger,
-        level: :warn,
-        backends: [:console]
-
-      config :logger,
-        level: :info,
-        truncate: 1024
-
-  will have a final configuration for `:logger` of:
-
-      [level: :info, backends: [:console], truncate: 1024]
-
-  """
-  @doc since: "1.9.0"
-  def config(root_key, opts) when is_atom(root_key) and is_list(opts) do
-    unless Keyword.keyword?(opts) do
-      raise ArgumentError, "config/2 expected a keyword list, got: #{inspect(opts)}"
-    end
-
-    get_config!()
-    |> __merge__([{root_key, opts}])
-    |> put_config()
-  end
-
-  @doc """
-  Configures the given `key` for the given `root_key`.
-
-  Keyword lists are always deep merged.
-
-  ## Examples
-
-  The given `opts` are merged into the existing values for `key`
-  in the given `root_key`. Conflicting keys are overridden by the
-  ones specified in `opts`, unless they are keywords, which are
-  deep merged recursively. For example, the application configuration
-  below
-
-      config :ecto, Repo,
-        log_level: :warn,
-        adapter: Ecto.Adapters.Postgres
-
-      config :ecto, Repo,
-        log_level: :info,
-        pool_size: 10
-
-  will have a final value of the configuration for the `Repo`
-  key in the `:ecto` application of:
-
-      [log_level: :info, pool_size: 10, adapter: Ecto.Adapters.Postgres]
-
-  """
-  @doc since: "1.9.0"
-  def config(root_key, key, opts) when is_atom(root_key) and is_atom(key) do
-    get_config!()
-    |> __merge__([{root_key, [{key, opts}]}])
-    |> put_config()
-  end
-
-  @doc """
-  Returns the environment this configuration file is executed on.
-
-  In Mix projects this function returns the environment this configuration
-  file is executed on. In releases, the environment when `mix release` ran.
-
-  This is most often used to execute conditional code:
-
-      if config_env() == :prod do
-        config :my_app, :debug, false
-      end
-
-  """
-  @doc since: "1.11.0"
-  defmacro config_env() do
-    quote do
-      Config.__env__!()
-    end
-  end
-
-  @doc false
-  @spec __env__!() :: atom()
-  def __env__!() do
-    elem(get_opts!(), 0) || raise "no :env key was given to this configuration file"
-  end
-
-  @doc """
-  Returns the target this configuration file is executed on.
-
-  This is most often used to execute conditional code:
-
-      if config_target() == :host do
-        config :my_app, :debug, false
-      end
-
-  """
-  @doc since: "1.11.0"
-  defmacro config_target() do
-    quote do
-      Config.__target__!()
-    end
-  end
-
-  @doc false
-  @spec __target__!() :: atom()
-  def __target__!() do
-    elem(get_opts!(), 1) || raise "no :target key was given to this configuration file"
-  end
-
-  @doc ~S"""
-  Imports configuration from the given file.
-
-  In case the file doesn't exist, an error is raised.
-
-  If file is a relative, it will be expanded relatively to the
-  directory the current configuration file is in.
-
-  ## Examples
-
-  This is often used to emulate configuration across environments:
-
-      import_config "#{config_env()}.exs"
-
-  Note, however, some configuration files, such as `config/runtime.exs`
-  does not support imports, as they are meant to be copied across
-  systems.
-  """
-  @doc since: "1.9.0"
-  defmacro import_config(file) do
-    quote do
-      Config.__import__!(Path.expand(unquote(file), __DIR__))
-      :ok
-    end
-  end
-
-  @doc false
-  @spec __import__!(Path.t()) :: {term, Code.binding()}
-  def __import__!(file) when is_binary(file) do
-    import_config!(file, File.read!(file), true)
-  end
-
-  @doc false
-  @spec __eval__!(Path.t(), binary(), keyword) :: {keyword, [Path.t()] | :disabled}
-  def __eval__!(file, content, opts \\ []) when is_binary(file) and is_list(opts) do
-    env = Keyword.get(opts, :env)
-    target = Keyword.get(opts, :target)
-    imports = Keyword.get(opts, :imports, [])
-
-    previous_opts = put_opts({env, target})
-    previous_config = put_config([])
-    previous_imports = put_imports(imports)
-
-    try do
-      {eval_config, _} = import_config!(file, content, false)
-
-      case get_config!() do
-        [] when is_list(eval_config) ->
-          {validate!(eval_config, file), get_imports!()}
-
-        pdict_config ->
-          {pdict_config, get_imports!()}
-      end
-    after
-      if previous_opts, do: put_opts(previous_opts), else: delete_opts()
-      if previous_config, do: put_config(previous_config), else: delete_config()
-      if previous_imports, do: put_imports(previous_imports), else: delete_imports()
-    end
-  end
-
-  defp import_config!(file, contents, raise_when_disabled?) do
-    current_imports = get_imports!()
-
-    cond do
-      current_imports == :disabled ->
-        if raise_when_disabled? do
-          raise "import_config/1 is not enabled for this configuration file. " <>
-                  "Some configuration files do not allow importing other files " <>
-                  "as they are often copied to external systems"
-        end
-
-      file in current_imports ->
-        raise ArgumentError,
-              "attempting to load configuration #{Path.relative_to_cwd(file)} recursively"
-
-      true ->
-        put_imports([file | current_imports])
-        :ok
-    end
-
-    # TODO: Emit a warning if Mix.env() is found in said files in Elixir v1.15.
-    # Note this won't be a deprecation warning as it will always be emitted.
-    Code.eval_string(contents, [], file: file)
-  end
-
-  @doc false
-  def __merge__(config1, config2) when is_list(config1) and is_list(config2) do
-    Keyword.merge(config1, config2, fn _, app1, app2 ->
-      Keyword.merge(app1, app2, &deep_merge/3)
-    end)
-  end
-
-  defp deep_merge(_key, value1, value2) do
-    if Keyword.keyword?(value1) and Keyword.keyword?(value2) do
-      Keyword.merge(value1, value2, &deep_merge/3)
-    else
-      value2
-    end
-  end
-
-  defp validate!(config, file) do
-    Enum.all?(config, fn
-      {app, value} when is_atom(app) ->
-        if Keyword.keyword?(value) do
-          true
-        else
-          raise ArgumentError,
-                "expected config for app #{inspect(app)} in #{Path.relative_to_cwd(file)} " <>
-                  "to return keyword list, got: #{inspect(value)}"
-        end
-
-      _ ->
-        false
-    end)
-
-    config
-  end
-end
@@ -1,416 +0,0 @@
-defmodule Config.Provider do
-  @moduledoc """
-  Specifies a provider API that loads configuration during boot.
-
-  Config providers are typically used during releases to load
-  external configuration while the system boots. This is done
-  by starting the VM with the minimum amount of applications
-  running, then invoking all of the providers, and then
-  restarting the system. This requires a mutable configuration
-  file on disk, as the results of the providers are written to
-  the file system. For more information on runtime configuration,
-  see `mix release`.
-
-  ## Multiple config files
-
-  One common use of config providers is to specify multiple
-  configuration files in a release. Elixir ships with one provider,
-  called `Config.Reader`, which is capable of handling Elixir's
-  built-in config files.
-
-  For example, imagine you want to list some basic configuration
-  on Mix's built-in `config/runtime.exs` file, but you also want
-  to support additional configuration files. To do so, you can add
-  this inside the `def project` portion of  your `mix.exs`:
-
-      releases: [
-        demo: [
-          config_providers: [
-            {Config.Reader, {:system, "RELEASE_ROOT", "/extra_config.exs"}}
-          ]
-        ]
-      ]
-
-  You can place this `extra_config.exs` file in your release in
-  multiple ways:
-
-    1. If it is available on the host when assembling the release,
-      you can place it on "rel/overlays/extra_config.exs" and it
-      will be automatically copied to the release root
-
-    2. If it is available on the target during deployment, you can
-      simply copy it to the release root as a step in your deployment
-
-  Now once the system boots, it will load both `config/runtime.exs`
-  and `extra_config.exs` early in the boot process. You can learn
-  more options on `Config.Reader`.
-
-  ## Custom config provider
-
-  You can also implement custom config providers, similar to how
-  `Config.Reader` works. For example, imagine you need to load
-  some configuration from a JSON file and load that into the system.
-  Said configuration provider would look like:
-
-      defmodule JSONConfigProvider do
-        @behaviour Config.Provider
-
-        # Let's pass the path to the JSON file as config
-        @impl true
-        def init(path) when is_binary(path), do: path
-
-        @impl true
-        def load(config, path) do
-          # We need to start any app we may depend on.
-          {:ok, _} = Application.ensure_all_started(:jason)
-
-          json = path |> File.read!() |> Jason.decode!()
-
-          Config.Reader.merge(
-            config,
-            my_app: [
-              some_value: json["my_app_some_value"],
-              another_value: json["my_app_another_value"],
-            ]
-          )
-        end
-      end
-
-  Then, when specifying your release, you can specify the provider in
-  the release configuration:
-
-      releases: [
-        demo: [
-          config_providers: [
-            {JSONConfigProvider, "/etc/config.json"}
-          ]
-        ]
-      ]
-
-  """
-
-  @type config :: keyword
-  @type state :: term
-
-  @typedoc """
-  A path pointing to a configuration file.
-
-  Since configuration files are often accessed on target machines,
-  it can be expressed either as:
-
-    * a binary representing an absolute path
-
-    * a `{:system, system_var, path}` tuple where the config is the
-      concatenation of the environment variable `system_var` with
-      the given `path`
-
-  """
-  @type config_path :: {:system, binary(), binary()} | binary()
-
-  @doc """
-  Invoked when initializing a config provider.
-
-  A config provider is typically initialized on the machine
-  where the system is assembled and not on the target machine.
-  The `c:init/1` callback is useful to verify the arguments
-  given to the provider and prepare the state that will be
-  given to `c:load/2`.
-
-  Furthermore, because the state returned by `c:init/1` can
-  be written to text-based config files, it should be
-  restricted only to simple data types, such as integers,
-  strings, atoms, tuples, maps, and lists. Entries such as
-  PIDs, references, and functions cannot be serialized.
-  """
-  @callback init(term) :: state
-
-  @doc """
-  Loads configuration (typically during system boot).
-
-  It receives the current `config` and the `state` returned by
-  `c:init/1`. Then, you typically read the extra configuration
-  from an external source and merge it into the received `config`.
-  Merging should be done with `Config.Reader.merge/2`, as it
-  performs deep merge. It should return the updated config.
-
-  Note that `c:load/2` is typically invoked very early in the
-  boot process, therefore if you need to use an application
-  in the provider, it is your responsibility to start it.
-  """
-  @callback load(config, state) :: config
-
-  @doc false
-  defstruct [
-    :providers,
-    :config_path,
-    extra_config: [],
-    prune_runtime_sys_config_after_boot: false,
-    reboot_system_after_config: false,
-    validate_compile_env: false
-  ]
-
-  @reserved_apps [:kernel, :stdlib]
-
-  @doc """
-  Validates a `t:config_path/0`.
-  """
-  @doc since: "1.9.0"
-  @spec validate_config_path!(config_path) :: :ok
-  def validate_config_path!({:system, name, path})
-      when is_binary(name) and is_binary(path),
-      do: :ok
-
-  def validate_config_path!(path) do
-    if is_binary(path) and Path.type(path) != :relative do
-      :ok
-    else
-      raise ArgumentError, """
-      expected configuration path to be:
-
-        * a binary representing an absolute path
-        * a tuple {:system, system_var, path} where the config is the \
-      concatenation of the `system_var` with the given `path`
-
-      Got: #{inspect(path)}
-      """
-    end
-  end
-
-  @doc """
-  Resolves a `t:config_path/0` to an actual path.
-  """
-  @doc since: "1.9.0"
-  @spec resolve_config_path!(config_path) :: binary
-  def resolve_config_path!(path) when is_binary(path), do: path
-  def resolve_config_path!({:system, name, path}), do: System.fetch_env!(name) <> path
-
-  # Private keys
-  @init_key :config_provider_init
-  @booted_key :config_provider_booted
-
-  # Public keys
-  @reboot_mode_key :config_provider_reboot_mode
-
-  @doc false
-  def init(providers, config_path, opts \\ []) when is_list(providers) and is_list(opts) do
-    validate_config_path!(config_path)
-    providers = for {provider, init} <- providers, do: {provider, provider.init(init)}
-    init = struct!(%Config.Provider{config_path: config_path, providers: providers}, opts)
-    [elixir: [{@init_key, init}]]
-  end
-
-  @doc false
-  def boot(reboot_fun \\ &restart_and_sleep/0) do
-    # The config provider typically runs very early in the
-    # release process, so we need to make sure Elixir is started
-    # before we go around running Elixir code.
-    {:ok, _} = :application.ensure_all_started(:elixir)
-
-    case Application.fetch_env(:elixir, @booted_key) do
-      {:ok, {:booted, path}} ->
-        path && File.rm(path)
-
-        with {:ok, %Config.Provider{} = provider} <- Application.fetch_env(:elixir, @init_key) do
-          maybe_validate_compile_env(provider)
-        end
-
-        :booted
-
-      _ ->
-        case Application.fetch_env(:elixir, @init_key) do
-          {:ok, %Config.Provider{} = provider} ->
-            path = resolve_config_path!(provider.config_path)
-            reboot_config = [elixir: [{@booted_key, booted_value(provider, path)}]]
-            boot_providers(path, provider, reboot_config, reboot_fun)
-
-          _ ->
-            :skip
-        end
-    end
-  end
-
-  defp boot_providers(path, provider, reboot_config, reboot_fun) do
-    original_config = read_config!(path)
-
-    config =
-      original_config
-      |> Config.__merge__(provider.extra_config)
-      |> run_providers(provider)
-
-    if provider.reboot_system_after_config do
-      config
-      |> Config.__merge__(reboot_config)
-      |> write_config!(path)
-
-      reboot_fun.()
-    else
-      for app <- @reserved_apps, config[app] != original_config[app] do
-        abort("""
-        Cannot configure #{inspect(app)} because :reboot_system_after_config has been set \
-        to false and #{inspect(app)} has already been loaded, meaning any further \
-        configuration won't have an effect.
-
-        The configuration for #{inspect(app)} before config providers was:
-
-        #{inspect(original_config[app])}
-
-        The configuration for #{inspect(app)} after config providers was:
-
-        #{inspect(config[app])}
-        """)
-      end
-
-      _ = Application.put_all_env(config, persistent: true)
-      maybe_validate_compile_env(provider)
-      :ok
-    end
-  end
-
-  defp maybe_validate_compile_env(provider) do
-    with [_ | _] = compile_env <- provider.validate_compile_env do
-      validate_compile_env(compile_env)
-    end
-  end
-
-  @doc false
-  def validate_compile_env(compile_env, ensure_loaded? \\ true) do
-    for {app, [key | path], compile_return} <- compile_env,
-        ensure_app_loaded?(app, ensure_loaded?) do
-      try do
-        traverse_env(Application.fetch_env(app, key), path)
-      rescue
-        e ->
-          abort("""
-          application #{inspect(app)} failed reading its compile environment #{path(key, path)}:
-
-          #{Exception.format(:error, e, __STACKTRACE__)}
-
-          Expected it to match the compile time value of #{return_to_text(compile_return)}.
-
-          #{compile_env_tips(app)}
-          """)
-      else
-        ^compile_return ->
-          :ok
-
-        runtime_return ->
-          abort("""
-          the application #{inspect(app)} has a different value set #{path(key, path)} \
-          during runtime compared to compile time. Since this application environment entry was \
-          marked as compile time, this difference can lead to different behaviour than expected:
-
-            * Compile time value #{return_to_text(compile_return)}
-            * Runtime value #{return_to_text(runtime_return)}
-
-          #{compile_env_tips(app)}
-          """)
-      end
-    end
-
-    :ok
-  end
-
-  defp ensure_app_loaded?(app, true), do: Application.ensure_loaded(app) == :ok
-  defp ensure_app_loaded?(app, false), do: Application.spec(app, :vsn) != nil
-
-  defp path(key, []), do: "for key #{inspect(key)}"
-  defp path(key, path), do: "for path #{inspect(path)} inside key #{inspect(key)}"
-
-  defp compile_env_tips(app),
-    do: """
-    To fix this error, you might:
-
-      * Make the runtime value match the compile time one
-
-      * Recompile your project. If the misconfigured application is a dependency, \
-    you may need to run "mix deps.compile #{app} --force"
-
-      * Alternatively, you can disable this check. If you are using releases, you can \
-    set :validate_compile_env to false in your release configuration. If you are \
-    using Mix to start your system, you can pass the --no-validate-compile-env flag
-    """
-
-  defp return_to_text({:ok, value}), do: "was set to: #{inspect(value)}"
-  defp return_to_text(:error), do: "was not set"
-
-  defp traverse_env(return, []), do: return
-  defp traverse_env(:error, _paths), do: :error
-  defp traverse_env({:ok, value}, [key | keys]), do: traverse_env(Access.fetch(value, key), keys)
-
-  @compile {:no_warn_undefined, {:init, :restart, 1}}
-  defp restart_and_sleep() do
-    mode = Application.get_env(:elixir, @reboot_mode_key)
-
-    # TODO: Remove otp_release check once we require Erlang/OTP 23+
-    if :erlang.system_info(:otp_release) >= '23' and mode in [:embedded, :interactive] do
-      :init.restart(mode: mode)
-    else
-      :init.restart()
-    end
-
-    Process.sleep(:infinity)
-  end
-
-  defp booted_value(%{prune_runtime_sys_config_after_boot: true}, path), do: {:booted, path}
-  defp booted_value(%{prune_runtime_sys_config_after_boot: false}, _path), do: {:booted, nil}
-
-  defp read_config!(path) do
-    case :file.consult(path) do
-      {:ok, [inner]} ->
-        inner
-
-      {:error, reason} ->
-        bad_path_abort(
-          "Could not read runtime configuration due to reason: #{inspect(reason)}",
-          path
-        )
-    end
-  end
-
-  defp run_providers(config, %{providers: providers}) do
-    Enum.reduce(providers, config, fn {provider, state}, acc ->
-      try do
-        provider.load(acc, state)
-      catch
-        kind, error ->
-          IO.puts(:stderr, "ERROR! Config provider #{inspect(provider)} failed with:")
-          IO.puts(:stderr, Exception.format(kind, error, __STACKTRACE__))
-          :erlang.raise(kind, error, __STACKTRACE__)
-      else
-        term when is_list(term) ->
-          term
-
-        term ->
-          abort("Expected provider #{inspect(provider)} to return a list, got: #{inspect(term)}")
-      end
-    end)
-  end
-
-  defp write_config!(config, path) do
-    contents = :io_lib.format("%% coding: utf-8~n~tw.~n", [config])
-
-    case File.write(path, IO.chardata_to_string(contents)) do
-      :ok ->
-        :ok
-
-      {:error, reason} ->
-        bad_path_abort(
-          "Could not write runtime configuration due to reason: #{inspect(reason)}",
-          path
-        )
-    end
-  end
-
-  defp bad_path_abort(msg, path) do
-    abort(
-      msg <>
-        ". Please make sure #{inspect(path)} is writable and accessible " <>
-        "or choose a different path"
-    )
-  end
-
-  defp abort(msg) do
-    IO.puts(:stderr, "ERROR! " <> msg)
-    :erlang.raise(:error, "aborting boot", [{Config.Provider, :boot, 2, []}])
-  end
-end
@@ -1,138 +0,0 @@
-defmodule Config.Reader do
-  @moduledoc """
-  API for reading config files defined with `Config`.
-
-  ## As a provider
-
-  `Config.Reader` can also be used as a `Config.Provider`. A config
-  provider is used during releases to customize how applications are
-  configured. When used as a provider, it expects a single argument:
-  the configuration path (as outlined in `t:Config.Provider.config_path/0`)
-  for the file to be read and loaded during the system boot.
-
-  For example, if you expect the target system to have a config file
-  in an absolute path, you can add this inside the `def project` portion
-  of  your `mix.exs`:
-
-      releases: [
-        demo: [
-          config_providers: [
-            {Config.Reader, "/etc/config.exs"}
-          ]
-        ]
-      ]
-
-  Or if you want to read a custom path inside the release:
-
-      config_providers: [{Config.Reader, {:system, "RELEASE_ROOT", "/config.exs"}}]
-
-  You can also pass a keyword list of options to the reader,
-  where the `:path` is a required key:
-
-      config_providers: [
-        {Config.Reader,
-         path: "/etc/config.exs",
-         env: :prod,
-         imports: :disabled}
-      ]
-
-  Remember Mix already loads `config/runtime.exs` by default.
-  For more examples and scenarios, see the `Config.Providers` module.
-  """
-
-  @behaviour Config.Provider
-
-  @impl true
-  def init(opts) when is_list(opts) do
-    {path, opts} = Keyword.pop!(opts, :path)
-    Config.Provider.validate_config_path!(path)
-    {path, opts}
-  end
-
-  def init(path) do
-    init(path: path)
-  end
-
-  @impl true
-  def load(config, {path, opts}) do
-    merge(config, path |> Config.Provider.resolve_config_path!() |> read!(opts))
-  end
-
-  @doc """
-  Evaluates the configuration `contents` for the given `file`.
-
-  Accepts the same options as `read!/2`.
-  """
-  @doc since: "1.11.0"
-  @spec eval!(Path.t(), binary, keyword) :: keyword
-  def eval!(file, contents, opts \\ [])
-      when is_binary(file) and is_binary(contents) and is_list(opts) do
-    Config.__eval__!(Path.expand(file), contents, opts) |> elem(0)
-  end
-
-  @doc """
-  Reads the configuration file.
-
-  ## Options
-
-    * `:imports` - a list of already imported paths or `:disabled`
-      to disable imports
-
-    * `:env` - the environment the configuration file runs on.
-      See `Config.config_env/0` for sample usage
-
-    * `:target` - the target the configuration file runs on.
-      See `Config.config_target/0` for sample usage
-
-  """
-  @doc since: "1.9.0"
-  @spec read!(Path.t(), keyword) :: keyword
-  def read!(file, opts \\ []) when is_binary(file) and is_list(opts) do
-    file = Path.expand(file)
-    Config.__eval__!(file, File.read!(file), opts) |> elem(0)
-  end
-
-  @doc """
-  Reads the given configuration file and returns the configuration
-  with its imports.
-
-  Accepts the same options as `read!/2`. Although note the `:imports`
-  option cannot be disabled in `read_imports!/2`.
-  """
-  @doc since: "1.9.0"
-  @spec read_imports!(Path.t(), keyword) :: {keyword, [Path.t()]}
-  def read_imports!(file, opts \\ []) when is_binary(file) and is_list(opts) do
-    if opts[:imports] == :disabled do
-      raise ArgumentError, ":imports must be a list of paths"
-    end
-
-    file = Path.expand(file)
-    Config.__eval__!(file, File.read!(file), opts)
-  end
-
-  @doc """
-  Merges two configurations.
-
-  The configurations are merged together with the values in
-  the second one having higher preference than the first in
-  case of conflicts. In case both values are set to keyword
-  lists, it deep merges them.
-
-  ## Examples
-
-      iex> Config.Reader.merge([app: [k: :v1]], [app: [k: :v2]])
-      [app: [k: :v2]]
-
-      iex> Config.Reader.merge([app: [k: [v1: 1, v2: 2]]], [app: [k: [v2: :a, v3: :b]]])
-      [app: [k: [v1: 1, v2: :a, v3: :b]]]
-
-      iex> Config.Reader.merge([app1: []], [app2: []])
-      [app1: [], app2: []]
-
-  """
-  @doc since: "1.9.0"
-  @spec merge(keyword, keyword) :: keyword
-  def merge(config1, config2) when is_list(config1) and is_list(config2) do
-    Config.__merge__(config1, config2)
-  end
-end
@@ -1,443 +1,152 @@
-defmodule Dict do
-  @moduledoc ~S"""
-  Generic API for dictionaries.
+defprotocol Dict do
+  @only [Record]

-  If you need a general dictionary, use the `Map` module.
-  If you need to manipulate keyword lists, use `Keyword`.
-
-  To convert maps into keywords and vice-versa, use the
-  `new` function in the respective modules.
+  @moduledoc """
+  This module provides the Dict protocol
+  with the goal of being a common API
+  to work with dictionaries.
  """

-  @moduledoc deprecated: "Use Map or Keyword modules instead"
+  @doc """
+  Returns a list containing all dict's keys.
+  The keys are not guaranteed to be sorted, unless
+  the underlying dict implementation defines so.

-  @type key :: any
-  @type value :: any
-  @type t :: list | map
+  ## Examples

-  message =
-    "Use the Map module for working with maps or the Keyword module for working with keyword lists"
+      Dict.keys [a: 1, b: 2]  #=> [:a,:b]

-  defmacro __using__(_) do
-    # Use this import to guarantee proper code expansion
-    import Kernel, except: [size: 1]
+  """
+  def keys(dict)

-    if __CALLER__.module != HashDict do
-      IO.warn("use Dict is deprecated. " <> unquote(message), Macro.Env.stacktrace(__CALLER__))
-    end
+  @doc """
+  Returns a list containing all dict's values.

-    quote do
-      message = "Use maps and the Map module instead"
+  ## Examples

-      @deprecated message
-      def get(dict, key, default \\ nil) do
-        case fetch(dict, key) do
-          {:ok, value} -> value
-          :error -> default
-        end
+      Dict.values [a: 1, b: 2]  #=> [1,2]
+
+  """
+  def values(dict)
+
+  @doc """
+  Returns the number of elements in `dict`.
+
+  ## Examples
+
+      Dict.size [a: 1, b: 2]  #=> 2
+
+  """
+  def size(dict)
+
+  @doc """
+  Returns whether the given key exists in the given dict.
+
+  ## Examples
+
+      Dict.has_key?([a: 1], :a)  #=> true
+      Dict.has_key?([a: 1], :b)  #=> false
+
+  """
+  def has_key?(dict, key)
+
+  @doc """
+  Returns the value associated with `key` in `dict`. If `dict` does not
+  contain `key`, returns `default` (or nil if not provided).
+
+  ## Examples
+
+      Dict.get [a: 1], :a     #=> 1
+      Dict.get [a: 1], :b     #=> nil
+      Dict.get [a: 1], :b, 3  #=> 3
+
+  """
+  def get(dict, key)
+  def get(dict, key, default)
+
+  @doc """
+  Stores the given `value` under `key` in `dict`.
+  If `dict` already has `key`, the stored value is replaced by the new one.
+
+  ## Examples
+
+      Dict.put [a: 1, b: 2], :a, 3
+      #=> [a: 3, b: 2]
+
+  """
+  def put(dict, key, val)
+
+  @doc """
+  Removes the entry stored under the given key from `dict`.
+  If `dict` does not contain `key`, returns the dictionary unchanged.
+
+  ## Examples
+
+      Dict.delete [a: 1, b: 2], :a  #=> [b: 2]
+      Dict.delete [b: 2], :a        #=> [b: 2]
+
+  """
+  def delete(dict, key)
+
+  @doc """
+  Merges two dicts into one. If the dicts have duplicated entries, the one
+  given as second argument wins.
+
+  ## Examples
+
+      Dict.merge [a: 1, b: 2], [a: 3, d: 4]
+      #=> [a:3, b:2, d: 4]
+
+  """
+  def merge(dict1, dict2)
+
+  @doc """
+  Merges two dicts into one. If the dicts have duplicated entries, the given
+  function is invoked to solve conflicts.
+
+  ## Examples
+
+      Dict.merge [a: 1, b: 2], [a: 3, d: 4], fn _k, v1, v2 ->
+        v1 + v2
      end
+      #=> [a: 4, b: 2, d: 4]

-      @deprecated message
-      def get_lazy(dict, key, fun) when is_function(fun, 0) do
-        case fetch(dict, key) do
-          {:ok, value} -> value
-          :error -> fun.()
-        end
-      end
+  """
+  def merge(dict1, dict2, fun)

-      @deprecated message
-      def get_and_update(dict, key, fun) do
-        current_value = get(dict, key)
-        {get, new_value} = fun.(current_value)
-        {get, put(dict, key, new_value)}
-      end
+  @doc """
+  Update a value in `dict` by calling `fun` on the value to get a new
+  value. An exception is generated if `key` is not present in the dict.

-      @deprecated message
-      def fetch!(dict, key) do
-        case fetch(dict, key) do
-          {:ok, value} -> value
-          :error -> raise KeyError, key: key, term: dict
-        end
-      end
+  ## Examples

-      @deprecated message
-      def has_key?(dict, key) do
-        match?({:ok, _}, fetch(dict, key))
-      end
+      Dict.update [a: 1, b: 2], :a, fn val -> -val end
+      #=> [a: -1, b: 2]

-      @deprecated message
-      def put_new(dict, key, value) do
-        case has_key?(dict, key) do
-          true -> dict
-          false -> put(dict, key, value)
-        end
-      end
+  """
+  def update(dict, key, fun)

-      @deprecated message
-      def put_new_lazy(dict, key, fun) when is_function(fun, 0) do
-        case has_key?(dict, key) do
-          true -> dict
-          false -> put(dict, key, fun.())
-        end
-      end
+  @doc """
+  Update a value in `dict` by calling `fun` on the value to get a new value. If
+  `key` is not present in `dict` then `initial` will be stored as the first
+  value.

-      @deprecated message
-      def drop(dict, keys) do
-        Enum.reduce(keys, dict, &delete(&2, &1))
-      end
+  ## Examples

-      @deprecated message
-      def take(dict, keys) do
-        Enum.reduce(keys, new(), fn key, acc ->
-          case fetch(dict, key) do
-            {:ok, value} -> put(acc, key, value)
-            :error -> acc
-          end
-        end)
-      end
+      Dict.update [a: 1, b: 2], :c, 3, fn val -> -val end
+      #=> [a: 1, b: 2, c: 3]

-      @deprecated message
-      def to_list(dict) do
-        reduce(dict, {:cont, []}, fn kv, acc -> {:cont, [kv | acc]} end)
-        |> elem(1)
-        |> :lists.reverse()
-      end
+  """
+  def update(dict, key, initial, fun)

-      @deprecated message
-      def keys(dict) do
-        reduce(dict, {:cont, []}, fn {k, _}, acc -> {:cont, [k | acc]} end)
-        |> elem(1)
-        |> :lists.reverse()
-      end
+  @doc """
+  Returns an empty dict of the same type as `dict`.
+  """
+  def empty(dict)

-      @deprecated message
-      def values(dict) do
-        reduce(dict, {:cont, []}, fn {_, v}, acc -> {:cont, [v | acc]} end)
-        |> elem(1)
-        |> :lists.reverse()
-      end
-
-      @deprecated message
-      def equal?(dict1, dict2) do
-        # Use this import to avoid conflicts in the user code
-        import Kernel, except: [size: 1]
-
-        case size(dict1) == size(dict2) do
-          false ->
-            false
-
-          true ->
-            reduce(dict1, {:cont, true}, fn {k, v}, _acc ->
-              case fetch(dict2, k) do
-                {:ok, ^v} -> {:cont, true}
-                _ -> {:halt, false}
-              end
-            end)
-            |> elem(1)
-        end
-      end
-
-      @deprecated message
-      def merge(dict1, dict2, fun \\ fn _k, _v1, v2 -> v2 end) do
-        # Use this import to avoid conflicts in the user code
-        import Kernel, except: [size: 1]
-
-        if size(dict1) < size(dict2) do
-          reduce(dict1, {:cont, dict2}, fn {k, v1}, acc ->
-            {:cont, update(acc, k, v1, &fun.(k, v1, &1))}
-          end)
-        else
-          reduce(dict2, {:cont, dict1}, fn {k, v2}, acc ->
-            {:cont, update(acc, k, v2, &fun.(k, &1, v2))}
-          end)
-        end
-        |> elem(1)
-      end
-
-      @deprecated message
-      def update(dict, key, default, fun) do
-        case fetch(dict, key) do
-          {:ok, value} ->
-            put(dict, key, fun.(value))
-
-          :error ->
-            put(dict, key, default)
-        end
-      end
-
-      @deprecated message
-      def update!(dict, key, fun) do
-        case fetch(dict, key) do
-          {:ok, value} ->
-            put(dict, key, fun.(value))
-
-          :error ->
-            raise KeyError, key: key, term: dict
-        end
-      end
-
-      @deprecated message
-      def pop(dict, key, default \\ nil) do
-        case fetch(dict, key) do
-          {:ok, value} ->
-            {value, delete(dict, key)}
-
-          :error ->
-            {default, dict}
-        end
-      end
-
-      @deprecated message
-      def pop_lazy(dict, key, fun) when is_function(fun, 0) do
-        case fetch(dict, key) do
-          {:ok, value} ->
-            {value, delete(dict, key)}
-
-          :error ->
-            {fun.(), dict}
-        end
-      end
-
-      @deprecated message
-      def split(dict, keys) do
-        Enum.reduce(keys, {new(), dict}, fn key, {inc, exc} = acc ->
-          case fetch(exc, key) do
-            {:ok, value} ->
-              {put(inc, key, value), delete(exc, key)}
-
-            :error ->
-              acc
-          end
-        end)
-      end
-
-      defoverridable merge: 2,
-                     merge: 3,
-                     equal?: 2,
-                     to_list: 1,
-                     keys: 1,
-                     values: 1,
-                     take: 2,
-                     drop: 2,
-                     get: 2,
-                     get: 3,
-                     fetch!: 2,
-                     has_key?: 2,
-                     put_new: 3,
-                     pop: 2,
-                     pop: 3,
-                     split: 2,
-                     update: 4,
-                     update!: 3,
-                     get_and_update: 3,
-                     get_lazy: 3,
-                     pop_lazy: 3,
-                     put_new_lazy: 3
-    end
-  end
-
-  defmacrop target(dict) do
-    quote do
-      case unquote(dict) do
-        %module{} -> module
-        %{} -> Map
-        dict when is_list(dict) -> Keyword
-        dict -> unsupported_dict(dict)
-      end
-    end
-  end
-
-  @deprecated message
-  @spec keys(t) :: [key]
-  def keys(dict) do
-    target(dict).keys(dict)
-  end
-
-  @deprecated message
-  @spec values(t) :: [value]
-  def values(dict) do
-    target(dict).values(dict)
-  end
-
-  @deprecated message
-  @spec size(t) :: non_neg_integer
-  def size(dict) do
-    target(dict).size(dict)
-  end
-
-  @deprecated message
-  @spec has_key?(t, key) :: boolean
-  def has_key?(dict, key) do
-    target(dict).has_key?(dict, key)
-  end
-
-  @deprecated message
-  @spec get(t, key, value) :: value
-  def get(dict, key, default \\ nil) do
-    target(dict).get(dict, key, default)
-  end
-
-  @deprecated message
-  @spec get_lazy(t, key, (() -> value)) :: value
-  def get_lazy(dict, key, fun) do
-    target(dict).get_lazy(dict, key, fun)
-  end
-
-  @deprecated message
-  @spec get_and_update(t, key, (value -> {value, value})) :: {value, t}
-  def get_and_update(dict, key, fun) do
-    target(dict).get_and_update(dict, key, fun)
-  end
-
-  @deprecated message
-  @spec fetch(t, key) :: value
-  def fetch(dict, key) do
-    target(dict).fetch(dict, key)
-  end
-
-  @deprecated message
-  @spec fetch!(t, key) :: value
-  def fetch!(dict, key) do
-    target(dict).fetch!(dict, key)
-  end
-
-  @deprecated message
-  @spec put(t, key, value) :: t
-  def put(dict, key, val) do
-    target(dict).put(dict, key, val)
-  end
-
-  @deprecated message
-  @spec put_new(t, key, value) :: t
-  def put_new(dict, key, val) do
-    target(dict).put_new(dict, key, val)
-  end
-
-  @deprecated message
-  @spec put_new_lazy(t, key, (() -> value)) :: t
-  def put_new_lazy(dict, key, fun) do
-    target(dict).put_new_lazy(dict, key, fun)
-  end
-
-  @deprecated message
-  @spec delete(t, key) :: t
-  def delete(dict, key) do
-    target(dict).delete(dict, key)
-  end
-
-  @deprecated message
-  @spec merge(t, t) :: t
-  def merge(dict1, dict2) do
-    target1 = target(dict1)
-    target2 = target(dict2)
-
-    if target1 == target2 do
-      target1.merge(dict1, dict2)
-    else
-      do_merge(target1, dict1, dict2, fn _k, _v1, v2 -> v2 end)
-    end
-  end
-
-  @deprecated message
-  @spec merge(t, t, (key, value, value -> value)) :: t
-  def merge(dict1, dict2, fun) do
-    target1 = target(dict1)
-    target2 = target(dict2)
-
-    if target1 == target2 do
-      target1.merge(dict1, dict2, fun)
-    else
-      do_merge(target1, dict1, dict2, fun)
-    end
-  end
-
-  defp do_merge(target1, dict1, dict2, fun) do
-    Enumerable.reduce(dict2, {:cont, dict1}, fn {k, v}, acc ->
-      {:cont, target1.update(acc, k, v, fn other -> fun.(k, other, v) end)}
-    end)
-    |> elem(1)
-  end
-
-  @deprecated message
-  @spec pop(t, key, value) :: {value, t}
-  def pop(dict, key, default \\ nil) do
-    target(dict).pop(dict, key, default)
-  end
-
-  @deprecated message
-  @spec pop_lazy(t, key, (() -> value)) :: {value, t}
-  def pop_lazy(dict, key, fun) do
-    target(dict).pop_lazy(dict, key, fun)
-  end
-
-  @deprecated message
-  @spec update!(t, key, (value -> value)) :: t
-  def update!(dict, key, fun) do
-    target(dict).update!(dict, key, fun)
-  end
-
-  @deprecated message
-  @spec update(t, key, value, (value -> value)) :: t
-  def update(dict, key, default, fun) do
-    target(dict).update(dict, key, default, fun)
-  end
-
-  @deprecated message
-  @spec split(t, [key]) :: {t, t}
-  def split(dict, keys) do
-    target(dict).split(dict, keys)
-  end
-
-  @deprecated message
-  @spec drop(t, [key]) :: t
-  def drop(dict, keys) do
-    target(dict).drop(dict, keys)
-  end
-
-  @deprecated message
-  @spec take(t, [key]) :: t
-  def take(dict, keys) do
-    target(dict).take(dict, keys)
-  end
-
-  @deprecated message
-  @spec empty(t) :: t
-  def empty(dict) do
-    target(dict).empty(dict)
-  end
-
-  @deprecated message
-  @spec equal?(t, t) :: boolean
-  def equal?(dict1, dict2) do
-    target1 = target(dict1)
-    target2 = target(dict2)
-
-    cond do
-      target1 == target2 ->
-        target1.equal?(dict1, dict2)
-
-      target1.size(dict1) == target2.size(dict2) ->
-        Enumerable.reduce(dict2, {:cont, true}, fn {k, v}, _acc ->
-          case target1.fetch(dict1, k) do
-            {:ok, ^v} -> {:cont, true}
-            _ -> {:halt, false}
-          end
-        end)
-        |> elem(1)
-
-      true ->
-        false
-    end
-  end
-
-  @deprecated message
-  @spec to_list(t) :: list
-  def to_list(dict) do
-    target(dict).to_list(dict)
-  end
-
-  @spec unsupported_dict(t) :: no_return
-  defp unsupported_dict(dict) do
-    raise ArgumentError, "unsupported dict: #{inspect(dict)}"
-  end
-end
+  @doc """
+  Returns a list of key-value pairs stored in `dict`.
+  No particular order is enforced.
+  """
+  def to_list(dict)
+end
@@ -0,0 +1,45 @@
+defmodule Dict.Common do
+  @moduledoc false
+
+  defmacro __using__(ref) do
+    quote do
+      @doc """
+      Creates a new empty dict.
+      """
+      def new do
+        unquote(ref).empty(nil)
+      end
+
+      @doc """
+      Creates a new dict from a list of pairs.
+
+      ## Examples
+
+          #{inspect(__MODULE__)}.new [{:b,1},{:a,2}]
+          #=> [a: 1, b: 2]
+
+      """
+      def new(pairs) do
+        Enum.reduce pairs, new, fn { k, v }, dict ->
+          unquote(ref).put(dict, k, v)
+        end
+      end
+
+      @doc """
+      Creates a new dict from a list of elements with the
+      help of the transformation function.
+
+      ## Examples
+
+          #{inspect(__MODULE__)}.new ["a", "b"], fn x -> {x, x} end
+          #=> ["a": "a", "b": "b"]
+      """
+      def new(list, transform) when is_function(transform) do
+        Enum.reduce list, new(), fn i, dict ->
+          { k, v } = transform.(i)
+          unquote(ref).put(dict, k, v)
+        end
+      end
+    end
+  end
+end
@@ -1,95 +0,0 @@
-require Record
-
-defmodule File.Stat do
-  @moduledoc """
-  A struct that holds file information.
-
-  In Erlang, this struct is represented by a `:file_info` record.
-  Therefore this module also provides functions for converting
-  between the Erlang record and the Elixir struct.
-
-  Its fields are:
-
-    * `size` - size of file in bytes.
-
-    * `type` - `:device | :directory | :regular | :other | :symlink`; the type of the
-      file.
-
-    * `access` - `:read | :write | :read_write | :none`; the current system
-      access to the file.
-
-    * `atime` - the last time the file was read.
-
-    * `mtime` - the last time the file was written.
-
-    * `ctime` - the interpretation of this time field depends on the operating
-      system. On Unix-like operating systems, it is the last time the file or the inode was changed.
-      In Windows, it is the time of creation.
-
-    * `mode` - the file permissions.
-
-    * `links` - the number of links to this file. This is always 1 for file
-      systems which have no concept of links.
-
-    * `major_device` - identifies the file system where the file is located.
-      In Windows, the number indicates a drive as follows: 0 means A:, 1 means
-      B:, and so on.
-
-    * `minor_device` - only valid for character devices on Unix-like systems. In all other
-      cases, this field is zero.
-
-    * `inode` - gives the inode number. On non-Unix-like file systems, this field
-      will be zero.
-
-    * `uid` - indicates the owner of the file. Will be zero for non-Unix-like file
-      systems.
-
-    * `gid` - indicates the group that owns the file. Will be zero for
-      non-Unix-like file systems.
-
-  The time type returned in `atime`, `mtime`, and `ctime` is dependent on the
-  time type set in options. `{:time, type}` where type can be `:local`,
-  `:universal`, or `:posix`. Default is `:universal`.
-  """
-
-  record = Record.extract(:file_info, from_lib: "kernel/include/file.hrl")
-  keys = :lists.map(&elem(&1, 0), record)
-  vals = :lists.map(&{&1, [], nil}, keys)
-  pairs = :lists.zip(keys, vals)
-
-  defstruct keys
-
-  @type t :: %__MODULE__{
-          size: non_neg_integer(),
-          type: :device | :directory | :regular | :other | :symlink,
-          access: :read | :write | :read_write | :none,
-          atime: :calendar.datetime() | integer(),
-          mtime: :calendar.datetime() | integer(),
-          ctime: :calendar.datetime() | integer(),
-          mode: non_neg_integer(),
-          links: non_neg_integer(),
-          major_device: non_neg_integer(),
-          minor_device: non_neg_integer(),
-          inode: non_neg_integer(),
-          uid: non_neg_integer(),
-          gid: non_neg_integer()
-        }
-
-  @doc """
-  Converts a `File.Stat` struct to a `:file_info` record.
-  """
-  @spec to_record(t()) :: :file.file_info()
-  def to_record(%File.Stat{unquote_splicing(pairs)}) do
-    {:file_info, unquote_splicing(vals)}
-  end
-
-  @doc """
-  Converts a `:file_info` record into a `File.Stat`.
-  """
-  @spec from_record(:file.file_info()) :: t()
-  def from_record(file_info)
-
-  def from_record({:file_info, unquote_splicing(vals)}) do
-    %File.Stat{unquote_splicing(pairs)}
-  end
-end
@@ -1,190 +0,0 @@
-defmodule File.Stream do
-  @moduledoc """
-  Defines a `File.Stream` struct returned by `File.stream!/3`.
-
-  The following fields are public:
-
-    * `path`          - the file path
-    * `modes`         - the file modes
-    * `raw`           - a boolean indicating if bin functions should be used
-    * `line_or_bytes` - if reading should read lines or a given number of bytes
-
-  """
-
-  defstruct path: nil, modes: [], line_or_bytes: :line, raw: true
-
-  @type t :: %__MODULE__{}
-
-  @doc false
-  def __build__(path, modes, line_or_bytes) do
-    raw = :lists.keyfind(:encoding, 1, modes) == false
-
-    modes =
-      case raw do
-        true ->
-          case :lists.keyfind(:read_ahead, 1, modes) do
-            {:read_ahead, false} -> [:raw | :lists.keydelete(:read_ahead, 1, modes)]
-            {:read_ahead, _} -> [:raw | modes]
-            false -> [:raw, :read_ahead | modes]
-          end
-
-        false ->
-          modes
-      end
-
-    %File.Stream{path: path, modes: modes, raw: raw, line_or_bytes: line_or_bytes}
-  end
-
-  defimpl Collectable do
-    def into(%{path: path, modes: modes, raw: raw} = stream) do
-      modes = for mode <- modes, mode not in [:read], do: mode
-
-      case :file.open(path, [:write | modes]) do
-        {:ok, device} ->
-          {:ok, into(device, stream, raw)}
-
-        {:error, reason} ->
-          raise File.Error, reason: reason, action: "stream", path: path
-      end
-    end
-
-    defp into(device, stream, raw) do
-      fn
-        :ok, {:cont, x} ->
-          case raw do
-            true -> IO.binwrite(device, x)
-            false -> IO.write(device, x)
-          end
-
-        :ok, :done ->
-          # If delayed_write option is used and the last write failed will
-          # MatchError here as {:error, _} is returned.
-          :ok = :file.close(device)
-          stream
-
-        :ok, :halt ->
-          # If delayed_write option is used and the last write failed will
-          # MatchError here as {:error, _} is returned.
-          :ok = :file.close(device)
-      end
-    end
-  end
-
-  defimpl Enumerable do
-    @read_ahead_size 64 * 1024
-
-    def reduce(%{path: path, modes: modes, line_or_bytes: line_or_bytes, raw: raw}, acc, fun) do
-      start_fun = fn ->
-        case :file.open(path, read_modes(modes)) do
-          {:ok, device} ->
-            if :trim_bom in modes, do: trim_bom(device, raw) |> elem(0), else: device
-
-          {:error, reason} ->
-            raise File.Error, reason: reason, action: "stream", path: path
-        end
-      end
-
-      next_fun =
-        case raw do
-          true -> &IO.each_binstream(&1, line_or_bytes)
-          false -> &IO.each_stream(&1, line_or_bytes)
-        end
-
-      Stream.resource(start_fun, next_fun, &:file.close/1).(acc, fun)
-    end
-
-    def count(%{path: path, modes: modes, line_or_bytes: :line} = stream) do
-      pattern = :binary.compile_pattern("\n")
-      counter = &count_lines(&1, path, pattern, read_function(stream), 0)
-
-      case File.open(path, read_modes(modes), counter) do
-        {:ok, count} ->
-          {:ok, count}
-
-        {:error, reason} ->
-          raise File.Error, reason: reason, action: "stream", path: path
-      end
-    end
-
-    def count(%{path: path, line_or_bytes: bytes, raw: true, modes: modes}) do
-      case File.stat(path) do
-        {:ok, %{size: 0}} ->
-          {:error, __MODULE__}
-
-        {:ok, %{size: size}} ->
-          remainder = if rem(size, bytes) == 0, do: 0, else: 1
-          {:ok, div(size, bytes) + remainder - count_raw_bom(path, modes)}
-
-        {:error, reason} ->
-          raise File.Error, reason: reason, action: "stream", path: path
-      end
-    end
-
-    def count(_stream) do
-      {:error, __MODULE__}
-    end
-
-    def member?(_stream, _term) do
-      {:error, __MODULE__}
-    end
-
-    def slice(_stream) do
-      {:error, __MODULE__}
-    end
-
-    defp count_raw_bom(path, modes) do
-      if :trim_bom in modes do
-        File.open!(path, read_modes(modes), &(&1 |> trim_bom(true) |> elem(1)))
-      else
-        0
-      end
-    end
-
-    defp trim_bom(device, true) do
-      bom_length = device |> IO.binread(4) |> bom_length()
-      {:ok, new_pos} = :file.position(device, bom_length)
-      {device, new_pos}
-    end
-
-    defp trim_bom(device, false) do
-      # Or we read the bom in the correct amount or it isn't there
-      case bom_length(IO.read(device, 1)) do
-        0 ->
-          {:ok, _} = :file.position(device, 0)
-          {device, 0}
-
-        _ ->
-          {device, 1}
-      end
-    end
-
-    defp bom_length(<<239, 187, 191, _rest::binary>>), do: 3
-    defp bom_length(<<254, 255, _rest::binary>>), do: 2
-    defp bom_length(<<255, 254, _rest::binary>>), do: 2
-    defp bom_length(<<0, 0, 254, 255, _rest::binary>>), do: 4
-    defp bom_length(<<254, 255, 0, 0, _rest::binary>>), do: 4
-    defp bom_length(_binary), do: 0
-
-    defp read_modes(modes) do
-      for mode <- modes, mode not in [:write, :append, :trim_bom], do: mode
-    end
-
-    defp count_lines(device, path, pattern, read, count) do
-      case read.(device) do
-        data when is_binary(data) ->
-          count_lines(device, path, pattern, read, count + count_lines(data, pattern))
-
-        :eof ->
-          count
-
-        {:error, reason} ->
-          raise File.Error, reason: reason, action: "stream", path: path
-      end
-    end
-
-    defp count_lines(data, pattern), do: length(:binary.matches(data, pattern))
-
-    defp read_function(%{raw: true}), do: &IO.binread(&1, @read_ahead_size)
-    defp read_function(%{raw: false}), do: &IO.read(&1, @read_ahead_size)
-  end
-end
@@ -1,575 +0,0 @@
-import Kernel, except: [round: 1]
-
-defmodule Float do
-  @moduledoc """
-  Functions for working with floating-point numbers.
-
-  ## Kernel functions
-
-  There are functions related to floating-point numbers on the `Kernel` module
-  too. Here is a list of them:
-
-    * `Kernel.round/1`: rounds a number to the nearest integer.
-    * `Kernel.trunc/1`: returns the integer part of a number.
-
-  ## Known issues
-
-  There are some very well known problems with floating-point numbers
-  and arithmetics due to the fact most decimal fractions cannot be
-  represented by a floating-point binary and most operations are not exact,
-  but operate on approximations. Those issues are not specific
-  to Elixir, they are a property of floating point representation itself.
-
-  For example, the numbers 0.1 and 0.01 are two of them, what means the result
-  of squaring 0.1 does not give 0.01 neither the closest representable. Here is
-  what happens in this case:
-
-    * The closest representable number to 0.1 is 0.1000000014
-    * The closest representable number to 0.01 is 0.0099999997
-    * Doing 0.1 * 0.1 should return 0.01, but because 0.1 is actually 0.1000000014,
-      the result is 0.010000000000000002, and because this is not the closest
-      representable number to 0.01, you'll get the wrong result for this operation
-
-  There are also other known problems like flooring or rounding numbers. See
-  `round/2` and `floor/2` for more details about them.
-
-  To learn more about floating-point arithmetic visit:
-
-    * [0.30000000000000004.com](http://0.30000000000000004.com/)
-    * [What Every Programmer Should Know About Floating-Point Arithmetic](https://floating-point-gui.de/)
-
-  """
-
-  import Bitwise
-
-  @power_of_2_to_52 4_503_599_627_370_496
-  @precision_range 0..15
-  @type precision_range :: 0..15
-
-  @doc """
-  Computes `base` raised to power of `exponent`.
-
-  `base` must be a float and `exponent` can be any number.
-  However, if a negative base and a fractional exponent
-  are given, it raises `ArithmeticError`.
-
-  It always returns a float. See `Integer.pow/2` for
-  exponentiation that returns integers.
-
-  ## Examples
-
-      iex> Float.pow(2.0, 0)
-      1.0
-      iex> Float.pow(2.0, 1)
-      2.0
-      iex> Float.pow(2.0, 10)
-      1024.0
-      iex> Float.pow(2.0, -1)
-      0.5
-      iex> Float.pow(2.0, -3)
-      0.125
-
-      iex> Float.pow(3.0, 1.5)
-      5.196152422706632
-
-      iex> Float.pow(-2.0, 3)
-      -8.0
-      iex> Float.pow(-2.0, 4)
-      16.0
-
-      iex> Float.pow(-1.0, 0.5)
-      ** (ArithmeticError) bad argument in arithmetic expression
-
-  """
-  @doc since: "1.12.0"
-  @spec pow(float, number) :: float
-  def pow(base, exponent) when is_float(base) and is_number(exponent),
-    do: :math.pow(base, exponent)
-
-  @doc """
-  Parses a binary into a float.
-
-  If successful, returns a tuple in the form of `{float, remainder_of_binary}`;
-  when the binary cannot be coerced into a valid float, the atom `:error` is
-  returned.
-
-  If the size of float exceeds the maximum size of `1.7976931348623157e+308`,
-  the `ArgumentError` exception is raised.
-
-  If you want to convert a string-formatted float directly to a float,
-  `String.to_float/1` can be used instead.
-
-  ## Examples
-
-      iex> Float.parse("34")
-      {34.0, ""}
-      iex> Float.parse("34.25")
-      {34.25, ""}
-      iex> Float.parse("56.5xyz")
-      {56.5, "xyz"}
-
-      iex> Float.parse("pi")
-      :error
-
-  """
-  @spec parse(binary) :: {float, binary} | :error
-  def parse("-" <> binary) do
-    case parse_unsigned(binary) do
-      :error -> :error
-      {number, remainder} -> {-number, remainder}
-    end
-  end
-
-  def parse("+" <> binary) do
-    parse_unsigned(binary)
-  end
-
-  def parse(binary) do
-    parse_unsigned(binary)
-  end
-
-  defp parse_unsigned(<<digit, rest::binary>>) when digit in ?0..?9,
-    do: parse_unsigned(rest, false, false, <<digit>>)
-
-  defp parse_unsigned(binary) when is_binary(binary), do: :error
-
-  defp parse_unsigned(<<digit, rest::binary>>, dot?, e?, acc) when digit in ?0..?9,
-    do: parse_unsigned(rest, dot?, e?, <<acc::binary, digit>>)
-
-  defp parse_unsigned(<<?., digit, rest::binary>>, false, false, acc) when digit in ?0..?9,
-    do: parse_unsigned(rest, true, false, <<acc::binary, ?., digit>>)
-
-  defp parse_unsigned(<<exp_marker, digit, rest::binary>>, dot?, false, acc)
-       when exp_marker in 'eE' and digit in ?0..?9,
-       do: parse_unsigned(rest, true, true, <<add_dot(acc, dot?)::binary, ?e, digit>>)
-
-  defp parse_unsigned(<<exp_marker, sign, digit, rest::binary>>, dot?, false, acc)
-       when exp_marker in 'eE' and sign in '-+' and digit in ?0..?9,
-       do: parse_unsigned(rest, true, true, <<add_dot(acc, dot?)::binary, ?e, sign, digit>>)
-
-  defp parse_unsigned(rest, dot?, _e?, acc),
-    do: {:erlang.binary_to_float(add_dot(acc, dot?)), rest}
-
-  defp add_dot(acc, true), do: acc
-  defp add_dot(acc, false), do: acc <> ".0"
-
-  @doc """
-  Rounds a float to the largest number less than or equal to `num`.
-
-  `floor/2` also accepts a precision to round a floating-point value down
-  to an arbitrary number of fractional digits (between 0 and 15).
-  The operation is performed on the binary floating point, without a
-  conversion to decimal.
-
-  This function always returns a float. `Kernel.trunc/1` may be used instead to
-  truncate the result to an integer afterwards.
-
-  ## Known issues
-
-  The behaviour of `floor/2` for floats can be surprising. For example:
-
-      iex> Float.floor(12.52, 2)
-      12.51
-
-  One may have expected it to floor to 12.52. This is not a bug.
-  Most decimal fractions cannot be represented as a binary floating point
-  and therefore the number above is internally represented as 12.51999999,
-  which explains the behaviour above.
-
-  ## Examples
-
-      iex> Float.floor(34.25)
-      34.0
-      iex> Float.floor(-56.5)
-      -57.0
-      iex> Float.floor(34.259, 2)
-      34.25
-
-  """
-  @spec floor(float, precision_range) :: float
-  def floor(number, precision \\ 0)
-
-  def floor(number, 0) when is_float(number) do
-    :math.floor(number)
-  end
-
-  def floor(number, precision) when is_float(number) and precision in @precision_range do
-    round(number, precision, :floor)
-  end
-
-  def floor(number, precision) when is_float(number) do
-    raise ArgumentError, invalid_precision_message(precision)
-  end
-
-  @doc """
-  Rounds a float to the smallest integer greater than or equal to `num`.
-
-  `ceil/2` also accepts a precision to round a floating-point value down
-  to an arbitrary number of fractional digits (between 0 and 15).
-
-  The operation is performed on the binary floating point, without a
-  conversion to decimal.
-
-  The behaviour of `ceil/2` for floats can be surprising. For example:
-
-      iex> Float.ceil(-12.52, 2)
-      -12.51
-
-  One may have expected it to ceil to -12.52. This is not a bug.
-  Most decimal fractions cannot be represented as a binary floating point
-  and therefore the number above is internally represented as -12.51999999,
-  which explains the behaviour above.
-
-  This function always returns floats. `Kernel.trunc/1` may be used instead to
-  truncate the result to an integer afterwards.
-
-  ## Examples
-
-      iex> Float.ceil(34.25)
-      35.0
-      iex> Float.ceil(-56.5)
-      -56.0
-      iex> Float.ceil(34.251, 2)
-      34.26
-
-  """
-  @spec ceil(float, precision_range) :: float
-  def ceil(number, precision \\ 0)
-
-  def ceil(number, 0) when is_float(number) do
-    :math.ceil(number)
-  end
-
-  def ceil(number, precision) when is_float(number) and precision in @precision_range do
-    round(number, precision, :ceil)
-  end
-
-  def ceil(number, precision) when is_float(number) do
-    raise ArgumentError, invalid_precision_message(precision)
-  end
-
-  @doc """
-  Rounds a floating-point value to an arbitrary number of fractional
-  digits (between 0 and 15).
-
-  The rounding direction always ties to half up. The operation is
-  performed on the binary floating point, without a conversion to decimal.
-
-  This function only accepts floats and always returns a float. Use
-  `Kernel.round/1` if you want a function that accepts both floats
-  and integers and always returns an integer.
-
-  ## Known issues
-
-  The behaviour of `round/2` for floats can be surprising. For example:
-
-      iex> Float.round(5.5675, 3)
-      5.567
-
-  One may have expected it to round to the half up 5.568. This is not a bug.
-  Most decimal fractions cannot be represented as a binary floating point
-  and therefore the number above is internally represented as 5.567499999,
-  which explains the behaviour above. If you want exact rounding for decimals,
-  you must use a decimal library. The behaviour above is also in accordance
-  to reference implementations, such as "Correctly Rounded Binary-Decimal and
-  Decimal-Binary Conversions" by David M. Gay.
-
-  ## Examples
-
-      iex> Float.round(12.5)
-      13.0
-      iex> Float.round(5.5674, 3)
-      5.567
-      iex> Float.round(5.5675, 3)
-      5.567
-      iex> Float.round(-5.5674, 3)
-      -5.567
-      iex> Float.round(-5.5675)
-      -6.0
-      iex> Float.round(12.341444444444441, 15)
-      12.341444444444441
-
-  """
-  @spec round(float, precision_range) :: float
-  # This implementation is slow since it relies on big integers.
-  # Faster implementations are available on more recent papers
-  # and could be implemented in the future.
-  def round(float, precision \\ 0)
-
-  def round(float, 0) when is_float(float) do
-    float |> :erlang.round() |> :erlang.float()
-  end
-
-  def round(float, precision) when is_float(float) and precision in @precision_range do
-    round(float, precision, :half_up)
-  end
-
-  def round(float, precision) when is_float(float) do
-    raise ArgumentError, invalid_precision_message(precision)
-  end
-
-  defp round(0.0 = num, _precision, _rounding), do: num
-
-  defp round(float, precision, rounding) do
-    <<sign::1, exp::11, significant::52-bitstring>> = <<float::float>>
-    {num, count} = decompose(significant, 1)
-    count = count - exp + 1023
-
-    cond do
-      # Precision beyond 15 digits
-      count >= 104 ->
-        case rounding do
-          :ceil when sign === 0 -> 1 / power_of_10(precision)
-          :floor when sign === 1 -> -1 / power_of_10(precision)
-          _ -> 0.0
-        end
-
-      # We are asking more precision than we have
-      count <= precision ->
-        float
-
-      true ->
-        # Difference in precision between float and asked precision
-        # We subtract 1 because we need to calculate the remainder too
-        diff = count - precision - 1
-
-        # Get up to latest so we calculate the remainder
-        power_of_10 = power_of_10(diff)
-
-        # Convert the numerand to decimal base
-        num = num * power_of_5(count)
-
-        # Move to the given precision - 1
-        num = div(num, power_of_10)
-        div = div(num, 10)
-        num = rounding(rounding, sign, num, div)
-
-        # Convert back to float without loss
-        # https://www.exploringbinary.com/correct-decimal-to-floating-point-using-big-integers/
-        den = power_of_10(precision)
-        boundary = den <<< 52
-
-        cond do
-          num == 0 ->
-            0.0
-
-          num >= boundary ->
-            {den, exp} = scale_down(num, boundary, 52)
-            decimal_to_float(sign, num, den, exp)
-
-          true ->
-            {num, exp} = scale_up(num, boundary, 52)
-            decimal_to_float(sign, num, den, exp)
-        end
-    end
-  end
-
-  defp decompose(significant, initial) do
-    decompose(significant, 1, 0, initial)
-  end
-
-  defp decompose(<<1::1, bits::bitstring>>, count, last_count, acc) do
-    decompose(bits, count + 1, count, (acc <<< (count - last_count)) + 1)
-  end
-
-  defp decompose(<<0::1, bits::bitstring>>, count, last_count, acc) do
-    decompose(bits, count + 1, last_count, acc)
-  end
-
-  defp decompose(<<>>, _count, last_count, acc) do
-    {acc, last_count}
-  end
-
-  defp scale_up(num, boundary, exp) when num >= boundary, do: {num, exp}
-  defp scale_up(num, boundary, exp), do: scale_up(num <<< 1, boundary, exp - 1)
-
-  defp scale_down(num, den, exp) do
-    new_den = den <<< 1
-
-    if num < new_den do
-      {den >>> 52, exp}
-    else
-      scale_down(num, new_den, exp + 1)
-    end
-  end
-
-  defp decimal_to_float(sign, num, den, exp) do
-    quo = div(num, den)
-    rem = num - quo * den
-
-    tmp =
-      case den >>> 1 do
-        den when rem > den -> quo + 1
-        den when rem < den -> quo
-        _ when (quo &&& 1) === 1 -> quo + 1
-        _ -> quo
-      end
-
-    tmp = tmp - @power_of_2_to_52
-    <<tmp::float>> = <<sign::1, exp + 1023::11, tmp::52>>
-    tmp
-  end
-
-  defp rounding(:floor, 1, _num, div), do: div + 1
-  defp rounding(:ceil, 0, _num, div), do: div + 1
-
-  defp rounding(:half_up, _sign, num, div) do
-    case rem(num, 10) do
-      rem when rem < 5 -> div
-      rem when rem >= 5 -> div + 1
-    end
-  end
-
-  defp rounding(_, _, _, div), do: div
-
-  Enum.reduce(0..104, 1, fn x, acc ->
-    defp power_of_10(unquote(x)), do: unquote(acc)
-    acc * 10
-  end)
-
-  Enum.reduce(0..104, 1, fn x, acc ->
-    defp power_of_5(unquote(x)), do: unquote(acc)
-    acc * 5
-  end)
-
-  @doc """
-  Returns a pair of integers whose ratio is exactly equal
-  to the original float and with a positive denominator.
-
-  ## Examples
-
-      iex> Float.ratio(0.0)
-      {0, 1}
-      iex> Float.ratio(3.14)
-      {7070651414971679, 2251799813685248}
-      iex> Float.ratio(-3.14)
-      {-7070651414971679, 2251799813685248}
-      iex> Float.ratio(1.5)
-      {3, 2}
-      iex> Float.ratio(-1.5)
-      {-3, 2}
-      iex> Float.ratio(16.0)
-      {16, 1}
-      iex> Float.ratio(-16.0)
-      {-16, 1}
-
-  """
-  @doc since: "1.4.0"
-  @spec ratio(float) :: {integer, pos_integer}
-  def ratio(0.0), do: {0, 1}
-
-  def ratio(float) when is_float(float) do
-    <<sign::1, exp::11, mantissa::52>> = <<float::float>>
-
-    {num, den_exp} =
-      if exp != 0 do
-        # Floats are expressed like this:
-        # (2**52 + mantissa) * 2**(-52 + exp - 1023)
-        #
-        # We compute the root factors of the mantissa so we have this:
-        # (2**52 + mantissa * 2**count) * 2**(-52 + exp - 1023)
-        {mantissa, count} = root_factors(mantissa, 0)
-
-        # Now we can move the count around so we have this:
-        # (2**(52-count) + mantissa) * 2**(count + -52 + exp - 1023)
-        if mantissa == 0 do
-          {1, exp - 1023}
-        else
-          num = (1 <<< (52 - count)) + mantissa
-          den_exp = count - 52 + exp - 1023
-          {num, den_exp}
-        end
-      else
-        # Subnormals are expressed like this:
-        # (mantissa) * 2**(-52 + 1 - 1023)
-        #
-        # So we compute it to this:
-        # (mantissa * 2**(count)) * 2**(-52 + 1 - 1023)
-        #
-        # Which becomes:
-        # mantissa * 2**(count-1074)
-        root_factors(mantissa, -1074)
-      end
-
-    if den_exp > 0 do
-      {sign(sign, num <<< den_exp), 1}
-    else
-      {sign(sign, num), 1 <<< -den_exp}
-    end
-  end
-
-  defp root_factors(mantissa, count) when mantissa != 0 and (mantissa &&& 1) == 0,
-    do: root_factors(mantissa >>> 1, count + 1)
-
-  defp root_factors(mantissa, count),
-    do: {mantissa, count}
-
-  @compile {:inline, sign: 2}
-  defp sign(0, num), do: num
-  defp sign(1, num), do: -num
-
-  @doc """
-  Returns a charlist which corresponds to the text representation
-  of the given float.
-
-  It uses the shortest representation according to algorithm described
-  in "Printing Floating-Point Numbers Quickly and Accurately" in
-  Proceedings of the SIGPLAN '96 Conference on Programming Language
-  Design and Implementation.
-
-  ## Examples
-
-      iex> Float.to_charlist(7.0)
-      '7.0'
-
-  """
-  @spec to_charlist(float) :: charlist
-  def to_charlist(float) when is_float(float) do
-    :io_lib_format.fwrite_g(float)
-  end
-
-  @doc """
-  Returns a binary which corresponds to the text representation
-  of the given float.
-
-  It uses the shortest representation according to algorithm described
-  in "Printing Floating-Point Numbers Quickly and Accurately" in
-  Proceedings of the SIGPLAN '96 Conference on Programming Language
-  Design and Implementation.
-
-  ## Examples
-
-      iex> Float.to_string(7.0)
-      "7.0"
-
-  """
-  @spec to_string(float) :: String.t()
-  def to_string(float) when is_float(float) do
-    IO.iodata_to_binary(:io_lib_format.fwrite_g(float))
-  end
-
-  @doc false
-  @deprecated "Use Float.to_charlist/1 instead"
-  def to_char_list(float), do: Float.to_charlist(float)
-
-  @doc false
-  @deprecated "Use :erlang.float_to_list/2 instead"
-  def to_char_list(float, options) do
-    :erlang.float_to_list(float, expand_compact(options))
-  end
-
-  @doc false
-  @deprecated "Use :erlang.float_to_binary/2 instead"
-  def to_string(float, options) do
-    :erlang.float_to_binary(float, expand_compact(options))
-  end
-
-  defp invalid_precision_message(precision) do
-    "precision #{precision} is out of valid range of #{inspect(@precision_range)}"
-  end
-
-  defp expand_compact([{:compact, false} | t]), do: expand_compact(t)
-  defp expand_compact([{:compact, true} | t]), do: [:compact | expand_compact(t)]
-  defp expand_compact([h | t]), do: [h | expand_compact(t)]
-  defp expand_compact([]), do: []
-end
@@ -1,208 +0,0 @@
-defmodule Function do
-  @moduledoc """
-  A set of functions for working with functions.
-
-  Anonymous functions are typically created by using `fn`:
-
-      iex> add = fn a, b -> a + b end
-      iex> add.(1, 2)
-      3
-
-  Anonymous functions can also have multiple clauses. All clauses
-  should expect the same number of arguments:
-
-      iex> negate = fn
-      ...>   true -> false
-      ...>   false -> true
-      ...> end
-      iex> negate.(false)
-      true
-
-  ## The capture operator
-
-  It is also possible to capture public module functions and pass them
-  around as if they were anonymous functions by using the capture
-  operator `Kernel.SpecialForms.&/1`:
-
-      iex> add = &Kernel.+/2
-      iex> add.(1, 2)
-      3
-
-      iex> length = &String.length/1
-      iex> length.("hello")
-      5
-
-  To capture a definition within the current module, you can skip the
-  module prefix, such as `&my_fun/2`. In those cases, the captured
-  function can be public (`def`) or private (`defp`).
-
-  The capture operator can also be used to create anonymous functions
-  that expect at least one argument:
-
-      iex> add = &(&1 + &2)
-      iex> add.(1, 2)
-      3
-
-  In such cases, using the capture operator is no different than using `fn`.
-
-  ## Internal and external functions
-
-  We say that functions that point to definitions residing in modules, such
-  as `&String.length/1`, are **external** functions. All other functions are
-  **local** and they are always bound to the file or module that defined them.
-
-  Besides the functions in this module to work with functions, `Kernel` also
-  has an `apply/2` function that invokes a function with a dynamic number of
-  arguments, as well as `is_function/1` and `is_function/2`, to check
-  respectively if a given value is a function or a function of a given arity.
-  """
-
-  @type information ::
-          :arity
-          | :env
-          | :index
-          | :module
-          | :name
-          | :new_index
-          | :new_uniq
-          | :pid
-          | :type
-          | :uniq
-
-  @doc """
-  Captures the given function.
-
-  Inlined by the compiler.
-
-  ## Examples
-
-      iex> Function.capture(String, :length, 1)
-      &String.length/1
-
-  """
-  @doc since: "1.7.0"
-  @spec capture(module, atom, arity) :: fun
-  def capture(module, function_name, arity) do
-    :erlang.make_fun(module, function_name, arity)
-  end
-
-  @doc """
-  Returns a keyword list with information about a function.
-
-  The returned keys (with the corresponding possible values) for
-  all types of functions (local and external) are the following:
-
-    * `:type` - `:local` (for anonymous functions) or `:external` (for
-      named functions).
-
-    * `:module` - an atom which is the module where the function is defined when
-    anonymous or the module which the function refers to when it's a named function.
-
-    * `:arity` - (integer) the number of arguments the function is to be called with.
-
-    * `:name` - (atom) the name of the function.
-
-    * `:env` - a list of the environment or free variables. For named
-      functions, the returned list is always empty.
-
-  When `fun` is an anonymous function (that is, the type is `:local`), the following
-  additional keys are returned:
-
-    * `:pid` - PID of the process that originally created the function.
-
-    * `:index` - (integer) an index into the module function table.
-
-    * `:new_index` - (integer) an index into the module function table.
-
-    * `:new_uniq` - (binary) a unique value for this function. It's
-      calculated from the compiled code for the entire module.
-
-    * `:uniq` - (integer) a unique value for this function. This integer is
-      calculated from the compiled code for the entire module.
-
-  **Note**: this function must be used only for debugging purposes.
-
-  Inlined by the compiler.
-
-  ## Examples
-
-      iex> fun = fn x -> x end
-      iex> info = Function.info(fun)
-      iex> Keyword.get(info, :arity)
-      1
-      iex> Keyword.get(info, :type)
-      :local
-
-      iex> fun = &String.length/1
-      iex> info = Function.info(fun)
-      iex> Keyword.get(info, :type)
-      :external
-      iex> Keyword.get(info, :name)
-      :length
-
-  """
-  @doc since: "1.7.0"
-  @spec info(fun) :: [{information, term}]
-  def info(fun), do: :erlang.fun_info(fun)
-
-  @doc """
-  Returns a specific information about the function.
-
-  The returned information is a two-element tuple in the shape of
-  `{info, value}`.
-
-  For any function, the information asked for can be any of the atoms
-  `:module`, `:name`, `:arity`, `:env`, or `:type`.
-
-  For anonymous functions, there is also information about any of the
-  atoms `:index`, `:new_index`, `:new_uniq`, `:uniq`, and `:pid`.
-  For a named function, the value of any of these items is always the
-  atom `:undefined`.
-
-  For more information on each of the possible returned values, see
-  `info/1`.
-
-  Inlined by the compiler.
-
-  ## Examples
-
-      iex> f = fn x -> x end
-      iex> Function.info(f, :arity)
-      {:arity, 1}
-      iex> Function.info(f, :type)
-      {:type, :local}
-
-      iex> fun = &String.length/1
-      iex> Function.info(fun, :name)
-      {:name, :length}
-      iex> Function.info(fun, :pid)
-      {:pid, :undefined}
-
-  """
-  @doc since: "1.7.0"
-  @spec info(fun, item) :: {item, term} when item: information
-  def info(fun, item), do: :erlang.fun_info(fun, item)
-
-  @doc """
-  Returns its input `value`. This function can be passed as an anonymous function
-  to transformation functions.
-
-  ## Examples
-
-      iex> Function.identity("Hello world!")
-      "Hello world!"
-
-      iex> 'abcdaabccc' |> Enum.sort() |> Enum.chunk_by(&Function.identity/1)
-      ['aaa', 'bb', 'cccc', 'd']
-
-      iex> Enum.group_by('abracadabra', &Function.identity/1)
-      %{97 => 'aaaaa', 98 => 'bb', 99 => 'c', 100 => 'd', 114 => 'rr'}
-
-      iex> Enum.map([1, 2, 3, 4], &Function.identity/1)
-      [1, 2, 3, 4]
-
-  """
-  @doc since: "1.10.0"
-  @spec identity(value) :: value when value: var
-  def identity(value), do: value
-end
@@ -1,903 +0,0 @@
-defmodule GenEvent do
-  # Functions from this module are deprecated in elixir_dispatch.
-
-  @moduledoc """
-  A event manager with event handlers behaviour.
-
-  If you are interested in implementing an event manager, please read the
-  "Alternatives" section below. If you have to implement an event handler to
-  integrate with an existing system, such as Elixir's Logger, please use
-  [`:gen_event`](`:gen_event`) instead.
-
-  ## Alternatives
-
-  There are a few suitable alternatives to replace GenEvent. Each of them can be
-  the most beneficial based on the use case.
-
-  ### Supervisor and GenServers
-
-  One alternative to GenEvent is a very minimal solution consisting of using a
-  supervisor and multiple GenServers started under it. The supervisor acts as
-  the "event manager" and the children GenServers act as the "event handlers".
-  This approach has some shortcomings (it provides no backpressure for example)
-  but can still replace GenEvent for low-profile usages of it. [This blog post
-  by José
-  Valim](http://blog.plataformatec.com.br/2016/11/replacing-genevent-by-a-supervisor-genserver/)
-  has more detailed information on this approach.
-
-  ### GenStage
-
-  If the use case where you were using GenEvent requires more complex logic,
-  [GenStage](https://github.com/elixir-lang/gen_stage) provides a great
-  alternative. GenStage is an external Elixir library maintained by the Elixir
-  team; it provides a tool to implement systems that exchange events in a
-  demand-driven way with built-in support for backpressure. See the [GenStage
-  documentation](https://hexdocs.pm/gen_stage) for more information.
-
-  ### `:gen_event`
-
-  If your use case requires exactly what GenEvent provided, or you have to
-  integrate with an existing `:gen_event`-based system, you can still use the
-  [`:gen_event`](`:gen_event`) Erlang module.
-  """
-
-  @moduledoc deprecated: "Use Erlang/OTP's :gen_event module instead"
-
-  @callback init(args :: term) ::
-              {:ok, state}
-              | {:ok, state, :hibernate}
-              | {:error, reason :: any}
-            when state: any
-
-  @callback handle_event(event :: term, state :: term) ::
-              {:ok, new_state}
-              | {:ok, new_state, :hibernate}
-              | :remove_handler
-            when new_state: term
-
-  @callback handle_call(request :: term, state :: term) ::
-              {:ok, reply, new_state}
-              | {:ok, reply, new_state, :hibernate}
-              | {:remove_handler, reply}
-            when reply: term, new_state: term
-
-  @callback handle_info(msg :: term, state :: term) ::
-              {:ok, new_state}
-              | {:ok, new_state, :hibernate}
-              | :remove_handler
-            when new_state: term
-
-  @callback terminate(reason, state :: term) :: term
-            when reason: :stop | {:stop, term} | :remove_handler | {:error, term} | term
-
-  @callback code_change(old_vsn, state :: term, extra :: term) :: {:ok, new_state :: term}
-            when old_vsn: term | {:down, term}
-
-  @type on_start :: {:ok, pid} | {:error, {:already_started, pid}}
-
-  @type name :: atom | {:global, term} | {:via, module, term}
-
-  @type options :: [name: name]
-
-  @type manager :: pid | name | {atom, node}
-
-  @type handler :: atom | {atom, term}
-
-  message = "Use one of the alternatives described in the documentation for the GenEvent module"
-
-  @deprecated message
-  @doc false
-  defmacro __using__(_) do
-    deprecation_message =
-      "the GenEvent module is deprecated, see its documentation for alternatives"
-
-    IO.warn(deprecation_message, Macro.Env.stacktrace(__CALLER__))
-
-    quote location: :keep do
-      @behaviour :gen_event
-
-      @doc false
-      def init(args) do
-        {:ok, args}
-      end
-
-      @doc false
-      def handle_event(_event, state) do
-        {:ok, state}
-      end
-
-      @doc false
-      def handle_call(msg, state) do
-        proc =
-          case Process.info(self(), :registered_name) do
-            {_, []} -> self()
-            {_, name} -> name
-          end
-
-        # We do this to trick Dialyzer to not complain about non-local returns.
-        case :erlang.phash2(1, 1) do
-          0 ->
-            raise "attempted to call GenEvent #{inspect(proc)} but no handle_call/2 clause was provided"
-
-          1 ->
-            {:remove_handler, {:bad_call, msg}}
-        end
-      end
-
-      @doc false
-      def handle_info(_msg, state) do
-        {:ok, state}
-      end
-
-      @doc false
-      def terminate(_reason, _state) do
-        :ok
-      end
-
-      @doc false
-      def code_change(_old, state, _extra) do
-        {:ok, state}
-      end
-
-      defoverridable init: 1,
-                     handle_event: 2,
-                     handle_call: 2,
-                     handle_info: 2,
-                     terminate: 2,
-                     code_change: 3
-    end
-  end
-
-  @doc false
-  @deprecated message
-  @spec start_link(options) :: on_start
-  def start_link(options \\ []) when is_list(options) do
-    do_start(:link, options)
-  end
-
-  @doc false
-  @deprecated message
-  @spec start(options) :: on_start
-  def start(options \\ []) when is_list(options) do
-    do_start(:nolink, options)
-  end
-
-  @no_callback :"no callback module"
-
-  defp do_start(mode, options) do
-    case Keyword.get(options, :name) do
-      nil ->
-        :gen.start(GenEvent, mode, @no_callback, [], [])
-
-      atom when is_atom(atom) ->
-        :gen.start(GenEvent, mode, {:local, atom}, @no_callback, [], [])
-
-      {:global, _term} = tuple ->
-        :gen.start(GenEvent, mode, tuple, @no_callback, [], [])
-
-      {:via, via_module, _term} = tuple when is_atom(via_module) ->
-        :gen.start(GenEvent, mode, tuple, @no_callback, [], [])
-
-      other ->
-        raise ArgumentError, """
-        expected :name option to be one of the following:
-
-          * nil
-          * atom
-          * {:global, term}
-          * {:via, module, term}
-
-        Got: #{inspect(other)}
-        """
-    end
-  end
-
-  @doc false
-  @deprecated message
-  @spec stream(manager, keyword) :: GenEvent.Stream.t()
-  def stream(manager, options \\ []) do
-    %GenEvent.Stream{manager: manager, timeout: Keyword.get(options, :timeout, :infinity)}
-  end
-
-  @doc false
-  @deprecated message
-  @spec add_handler(manager, handler, term) :: :ok | {:error, term}
-  def add_handler(manager, handler, args) do
-    rpc(manager, {:add_handler, handler, args})
-  end
-
-  @doc false
-  @deprecated message
-  @spec add_mon_handler(manager, handler, term) :: :ok | {:error, term}
-  def add_mon_handler(manager, handler, args) do
-    rpc(manager, {:add_mon_handler, handler, args, self()})
-  end
-
-  @doc false
-  @deprecated message
-  @spec notify(manager, term) :: :ok
-  def notify(manager, event)
-
-  def notify({:global, name}, msg) do
-    try do
-      :global.send(name, {:notify, msg})
-      :ok
-    catch
-      _, _ -> :ok
-    end
-  end
-
-  def notify({:via, mod, name}, msg) when is_atom(mod) do
-    try do
-      mod.send(name, {:notify, msg})
-      :ok
-    catch
-      _, _ -> :ok
-    end
-  end
-
-  def notify(manager, msg)
-      when is_pid(manager)
-      when is_atom(manager)
-      when tuple_size(manager) == 2 and is_atom(elem(manager, 0)) and is_atom(elem(manager, 1)) do
-    send(manager, {:notify, msg})
-    :ok
-  end
-
-  @doc false
-  @deprecated message
-  @spec sync_notify(manager, term) :: :ok
-  def sync_notify(manager, event) do
-    rpc(manager, {:sync_notify, event})
-  end
-
-  @doc false
-  @deprecated message
-  @spec ack_notify(manager, term) :: :ok
-  def ack_notify(manager, event) do
-    rpc(manager, {:ack_notify, event})
-  end
-
-  @doc false
-  @deprecated message
-  @spec call(manager, handler, term, timeout) :: term | {:error, term}
-  def call(manager, handler, request, timeout \\ 5000) do
-    try do
-      :gen.call(manager, self(), {:call, handler, request}, timeout)
-    catch
-      :exit, reason ->
-        exit({reason, {__MODULE__, :call, [manager, handler, request, timeout]}})
-    else
-      {:ok, res} -> res
-    end
-  end
-
-  @doc false
-  @deprecated message
-  @spec remove_handler(manager, handler, term) :: term | {:error, term}
-  def remove_handler(manager, handler, args) do
-    rpc(manager, {:delete_handler, handler, args})
-  end
-
-  @doc false
-  @deprecated message
-  @spec swap_handler(manager, handler, term, handler, term) :: :ok | {:error, term}
-  def swap_handler(manager, handler1, args1, handler2, args2) do
-    rpc(manager, {:swap_handler, handler1, args1, handler2, args2})
-  end
-
-  @doc false
-  @deprecated message
-  @spec swap_mon_handler(manager, handler, term, handler, term) :: :ok | {:error, term}
-  def swap_mon_handler(manager, handler1, args1, handler2, args2) do
-    rpc(manager, {:swap_mon_handler, handler1, args1, handler2, args2, self()})
-  end
-
-  @doc false
-  @deprecated message
-  @spec which_handlers(manager) :: [handler]
-  def which_handlers(manager) do
-    rpc(manager, :which_handlers)
-  end
-
-  @doc false
-  @deprecated message
-  @spec stop(manager, reason :: term, timeout) :: :ok
-  def stop(manager, reason \\ :normal, timeout \\ :infinity) do
-    :gen.stop(manager, reason, timeout)
-  end
-
-  defp rpc(module, cmd) do
-    {:ok, reply} = :gen.call(module, self(), cmd, :infinity)
-    reply
-  end
-
-  ## Init callbacks
-
-  require Record
-  Record.defrecordp(:handler, [:module, :id, :state, :pid, :ref])
-
-  @doc false
-  def init_it(starter, :self, name, mod, args, options) do
-    init_it(starter, self(), name, mod, args, options)
-  end
-
-  def init_it(starter, parent, name, _mod, _args, options) do
-    Process.put(:"$initial_call", {__MODULE__, :init_it, 6})
-    debug = :gen.debug_options(name, options)
-    :proc_lib.init_ack(starter, {:ok, self()})
-    loop(parent, name(name), [], debug, false)
-  end
-
-  @doc false
-  def init_hib(parent, name, handlers, debug) do
-    fetch_msg(parent, name, handlers, debug, true)
-  end
-
-  defp name({:local, name}), do: name
-  defp name({:global, name}), do: name
-  defp name({:via, _, name}), do: name
-  defp name(pid) when is_pid(pid), do: pid
-
-  ## Loop
-
-  defp loop(parent, name, handlers, debug, true) do
-    :proc_lib.hibernate(__MODULE__, :init_hib, [parent, name, handlers, debug])
-  end
-
-  defp loop(parent, name, handlers, debug, false) do
-    fetch_msg(parent, name, handlers, debug, false)
-  end
-
-  defp fetch_msg(parent, name, handlers, debug, hib) do
-    receive do
-      {:system, from, req} ->
-        :sys.handle_system_msg(req, from, parent, __MODULE__, debug, [name, handlers, hib], hib)
-
-      {:EXIT, ^parent, reason} ->
-        server_terminate(reason, parent, handlers, name)
-
-      msg when debug == [] ->
-        handle_msg(msg, parent, name, handlers, [])
-
-      msg ->
-        debug = :sys.handle_debug(debug, &print_event/3, name, {:in, msg})
-        handle_msg(msg, parent, name, handlers, debug)
-    end
-  end
-
-  defp handle_msg(msg, parent, name, handlers, debug) do
-    case msg do
-      {:notify, event} ->
-        {hib, handlers} = server_event(:async, event, handlers, name)
-        loop(parent, name, handlers, debug, hib)
-
-      {_from, _tag, {:notify, event}} ->
-        {hib, handlers} = server_event(:async, event, handlers, name)
-        loop(parent, name, handlers, debug, hib)
-
-      {_from, tag, {:ack_notify, event}} ->
-        reply(tag, :ok)
-        {hib, handlers} = server_event(:ack, event, handlers, name)
-        loop(parent, name, handlers, debug, hib)
-
-      {_from, tag, {:sync_notify, event}} ->
-        {hib, handlers} = server_event(:sync, event, handlers, name)
-        reply(tag, :ok)
-        loop(parent, name, handlers, debug, hib)
-
-      {:DOWN, ref, :process, _pid, reason} = other ->
-        case handle_down(ref, reason, handlers, name) do
-          {:ok, handlers} ->
-            loop(parent, name, handlers, debug, false)
-
-          :error ->
-            {hib, handlers} = server_info(other, handlers, name)
-            loop(parent, name, handlers, debug, hib)
-        end
-
-      {_from, tag, {:call, handler, query}} ->
-        {hib, reply, handlers} = server_call(handler, query, handlers, name)
-        reply(tag, reply)
-        loop(parent, name, handlers, debug, hib)
-
-      {_from, tag, {:add_handler, handler, args}} ->
-        {hib, reply, handlers} = server_add_handler(handler, args, handlers)
-        reply(tag, reply)
-        loop(parent, name, handlers, debug, hib)
-
-      {_from, tag, {:add_mon_handler, handler, args, notify}} ->
-        {hib, reply, handlers} = server_add_mon_handler(handler, args, handlers, notify)
-        reply(tag, reply)
-        loop(parent, name, handlers, debug, hib)
-
-      {_from, tag, {:add_process_handler, pid, notify}} ->
-        {hib, reply, handlers} = server_add_process_handler(pid, handlers, notify)
-        reply(tag, reply)
-        loop(parent, name, handlers, debug, hib)
-
-      {_from, tag, {:delete_handler, handler, args}} ->
-        {reply, handlers} = server_remove_handler(handler, args, handlers, name)
-        reply(tag, reply)
-        loop(parent, name, handlers, debug, false)
-
-      {_from, tag, {:swap_handler, handler1, args1, handler2, args2}} ->
-        {hib, reply, handlers} =
-          server_swap_handler(handler1, args1, handler2, args2, handlers, nil, name)
-
-        reply(tag, reply)
-        loop(parent, name, handlers, debug, hib)
-
-      {_from, tag, {:swap_mon_handler, handler1, args1, handler2, args2, mon}} ->
-        {hib, reply, handlers} =
-          server_swap_handler(handler1, args1, handler2, args2, handlers, mon, name)
-
-        reply(tag, reply)
-        loop(parent, name, handlers, debug, hib)
-
-      {_from, tag, :which_handlers} ->
-        reply(tag, server_which_handlers(handlers))
-        loop(parent, name, handlers, debug, false)
-
-      {_from, tag, :get_modules} ->
-        reply(tag, server_get_modules(handlers))
-        loop(parent, name, handlers, debug, false)
-
-      other ->
-        {hib, handlers} = server_info(other, handlers, name)
-        loop(parent, name, handlers, debug, hib)
-    end
-  end
-
-  ## System callbacks
-
-  @doc false
-  def system_continue(parent, debug, [name, handlers, hib]) do
-    loop(parent, name, handlers, debug, hib)
-  end
-
-  @doc false
-  def system_terminate(reason, parent, _debug, [name, handlers, _hib]) do
-    server_terminate(reason, parent, handlers, name)
-  end
-
-  @doc false
-  def system_code_change([name, handlers, hib], module, old_vsn, extra) do
-    handlers =
-      for handler <- handlers do
-        if handler(handler, :module) == module do
-          {:ok, state} = module.code_change(old_vsn, handler(handler, :state), extra)
-          handler(handler, state: state)
-        else
-          handler
-        end
-      end
-
-    {:ok, [name, handlers, hib]}
-  end
-
-  @doc false
-  def system_get_state([_name, handlers, _hib]) do
-    tuples =
-      for handler(module: mod, id: id, state: state) <- handlers do
-        {mod, id, state}
-      end
-
-    {:ok, tuples}
-  end
-
-  @doc false
-  def system_replace_state(fun, [name, handlers, hib]) do
-    {handlers, states} =
-      :lists.unzip(
-        for handler <- handlers do
-          handler(module: mod, id: id, state: state) = handler
-          cur = {mod, id, state}
-
-          try do
-            new = {^mod, ^id, new_state} = fun.(cur)
-            {handler(handler, state: new_state), new}
-          catch
-            _, _ ->
-              {handler, cur}
-          end
-        end
-      )
-
-    {:ok, states, [name, handlers, hib]}
-  end
-
-  @doc false
-  def format_status(opt, status_data) do
-    [pdict, sys_state, parent, _debug, [name, handlers, _hib]] = status_data
-    header = :gen.format_status_header('Status for event handler', name)
-
-    formatted =
-      for handler <- handlers do
-        handler(module: module, state: state) = handler
-
-        if function_exported?(module, :format_status, 2) do
-          try do
-            state = module.format_status(opt, [pdict, state])
-            handler(handler, state: state)
-          catch
-            _, _ -> handler
-          end
-        else
-          handler
-        end
-      end
-
-    [
-      header: header,
-      data: [{'Status', sys_state}, {'Parent', parent}],
-      items: {'Installed handlers', formatted}
-    ]
-  end
-
-  ## Loop helpers
-
-  defp print_event(dev, {:in, msg}, name) do
-    case msg do
-      {:notify, event} ->
-        IO.puts(dev, "*DBG* #{inspect(name)} got event #{inspect(event)}")
-
-      {_, _, {:call, handler, query}} ->
-        IO.puts(
-          dev,
-          "*DBG* #{inspect(name)} (handler #{inspect(handler)}) got call #{inspect(query)}"
-        )
-
-      _ ->
-        IO.puts(dev, "*DBG* #{inspect(name)} got #{inspect(msg)}")
-    end
-  end
-
-  defp print_event(dev, dbg, name) do
-    IO.puts(dev, "*DBG* #{inspect(name)}: #{inspect(dbg)}")
-  end
-
-  defp server_add_handler({module, id}, args, handlers) do
-    handler = handler(module: module, id: {module, id})
-    do_add_handler(module, handler, args, handlers, :ok)
-  end
-
-  defp server_add_handler(module, args, handlers) do
-    handler = handler(module: module, id: module)
-    do_add_handler(module, handler, args, handlers, :ok)
-  end
-
-  defp server_add_mon_handler({module, id}, args, handlers, notify) do
-    ref = Process.monitor(notify)
-    handler = handler(module: module, id: {module, id}, pid: notify, ref: ref)
-    do_add_handler(module, handler, args, handlers, :ok)
-  end
-
-  defp server_add_mon_handler(module, args, handlers, notify) do
-    ref = Process.monitor(notify)
-    handler = handler(module: module, id: module, pid: notify, ref: ref)
-    do_add_handler(module, handler, args, handlers, :ok)
-  end
-
-  defp server_add_process_handler(pid, handlers, notify) do
-    ref = Process.monitor(pid)
-    handler = handler(module: GenEvent.Stream, id: {self(), ref}, pid: notify, ref: ref)
-    do_add_handler(GenEvent.Stream, handler, {pid, ref}, handlers, {self(), ref})
-  end
-
-  defp server_remove_handler(module, args, handlers, name) do
-    do_take_handler(module, args, handlers, name, :remove, :normal)
-  end
-
-  defp server_swap_handler(module1, args1, module2, args2, handlers, sup, name) do
-    {state, handlers} =
-      do_take_handler(module1, args1, handlers, name, :swapped, {:swapped, module2, sup})
-
-    if sup do
-      server_add_mon_handler(module2, {args2, state}, handlers, sup)
-    else
-      server_add_handler(module2, {args2, state}, handlers)
-    end
-  end
-
-  defp server_info(event, handlers, name) do
-    handlers = :lists.reverse(handlers)
-    server_notify(event, :handle_info, handlers, name, handlers, [], false)
-  end
-
-  defp server_event(mode, event, handlers, name) do
-    {handlers, streams} = server_split_process_handlers(mode, event, handlers, [], [])
-    {hib, handlers} = server_notify(event, :handle_event, handlers, name, handlers, [], false)
-    {hib, server_collect_process_handlers(mode, event, streams, handlers, name)}
-  end
-
-  defp server_split_process_handlers(mode, event, [handler | t], handlers, streams) do
-    case handler(handler, :id) do
-      {pid, _ref} when is_pid(pid) ->
-        server_process_notify(mode, event, handler)
-        server_split_process_handlers(mode, event, t, handlers, [handler | streams])
-
-      _ ->
-        server_split_process_handlers(mode, event, t, [handler | handlers], streams)
-    end
-  end
-
-  defp server_split_process_handlers(_mode, _event, [], handlers, streams) do
-    {handlers, streams}
-  end
-
-  defp server_process_notify(mode, event, handler(state: {pid, ref})) do
-    send(pid, {self(), {self(), ref}, {mode_to_tag(mode), event}})
-  end
-
-  defp mode_to_tag(:ack), do: :ack_notify
-  defp mode_to_tag(:sync), do: :sync_notify
-  defp mode_to_tag(:async), do: :notify
-
-  defp server_notify(event, fun, [handler | t], name, handlers, acc, hib) do
-    case server_update(handler, fun, event, name, handlers) do
-      {new_hib, handler} ->
-        server_notify(event, fun, t, name, handlers, [handler | acc], hib or new_hib)
-
-      :error ->
-        server_notify(event, fun, t, name, handlers, acc, hib)
-    end
-  end
-
-  defp server_notify(_, _, [], _, _, acc, hib) do
-    {hib, acc}
-  end
-
-  defp server_update(handler, fun, event, name, _handlers) do
-    handler(module: module, state: state) = handler
-
-    case do_handler(module, fun, [event, state]) do
-      {:ok, res} ->
-        case res do
-          {:ok, state} ->
-            {false, handler(handler, state: state)}
-
-          {:ok, state, :hibernate} ->
-            {true, handler(handler, state: state)}
-
-          :remove_handler ->
-            do_terminate(handler, :remove_handler, event, name, :normal)
-            :error
-
-          other ->
-            reason = {:bad_return_value, other}
-            do_terminate(handler, {:error, reason}, event, name, reason)
-            :error
-        end
-
-      {:error, reason} ->
-        do_terminate(handler, {:error, reason}, event, name, reason)
-        :error
-    end
-  end
-
-  defp server_collect_process_handlers(:async, event, [handler | t], handlers, name) do
-    server_collect_process_handlers(:async, event, t, [handler | handlers], name)
-  end
-
-  defp server_collect_process_handlers(mode, event, [handler | t], handlers, name)
-       when mode in [:sync, :ack] do
-    handler(ref: ref, id: id) = handler
-
-    receive do
-      {^ref, :ok} ->
-        server_collect_process_handlers(mode, event, t, [handler | handlers], name)
-
-      {_from, tag, {:delete_handler, ^id, args}} ->
-        do_terminate(handler, args, :remove, name, :normal)
-        reply(tag, :ok)
-        server_collect_process_handlers(mode, event, t, handlers, name)
-
-      {:DOWN, ^ref, _, _, reason} ->
-        do_terminate(handler, {:stop, reason}, :DOWN, name, :shutdown)
-        server_collect_process_handlers(mode, event, t, handlers, name)
-    end
-  end
-
-  defp server_collect_process_handlers(_mode, _event, [], handlers, _name) do
-    handlers
-  end
-
-  defp server_call(module, query, handlers, name) do
-    case :lists.keyfind(module, handler(:id) + 1, handlers) do
-      false ->
-        {false, {:error, :not_found}, handlers}
-
-      handler ->
-        case server_call_update(handler, query, name, handlers) do
-          {{hib, handler}, reply} ->
-            {hib, reply, :lists.keyreplace(module, handler(:id) + 1, handlers, handler)}
-
-          {:error, reply} ->
-            {false, reply, :lists.keydelete(module, handler(:id) + 1, handlers)}
-        end
-    end
-  end
-
-  defp server_call_update(handler, query, name, _handlers) do
-    handler(module: module, state: state) = handler
-
-    case do_handler(module, :handle_call, [query, state]) do
-      {:ok, res} ->
-        case res do
-          {:ok, reply, state} ->
-            {{false, handler(handler, state: state)}, reply}
-
-          {:ok, reply, state, :hibernate} ->
-            {{true, handler(handler, state: state)}, reply}
-
-          {:remove_handler, reply} ->
-            do_terminate(handler, :remove_handler, query, name, :normal)
-            {:error, reply}
-
-          other ->
-            reason = {:bad_return_value, other}
-            do_terminate(handler, {:error, reason}, query, name, reason)
-            {:error, {:error, reason}}
-        end
-
-      {:error, reason} ->
-        do_terminate(handler, {:error, reason}, query, name, reason)
-        {:error, {:error, reason}}
-    end
-  end
-
-  defp server_get_modules(handlers) do
-    for(handler(module: module) <- handlers, do: module)
-    |> :ordsets.from_list()
-    |> :ordsets.to_list()
-  end
-
-  defp server_which_handlers(handlers) do
-    for handler(id: id) <- handlers, do: id
-  end
-
-  defp server_terminate(reason, _parent, handlers, name) do
-    _ =
-      for handler <- handlers do
-        do_terminate(handler, :stop, :stop, name, :shutdown)
-      end
-
-    exit(reason)
-  end
-
-  defp reply({from, ref}, msg) do
-    send(from, {ref, msg})
-  end
-
-  defp handle_down(ref, reason, handlers, name) do
-    case :lists.keyfind(ref, handler(:ref) + 1, handlers) do
-      false ->
-        :error
-
-      handler ->
-        do_terminate(handler, {:stop, reason}, :DOWN, name, :shutdown)
-        {:ok, :lists.keydelete(ref, handler(:ref) + 1, handlers)}
-    end
-  end
-
-  defp do_add_handler(module, handler, arg, handlers, succ) do
-    case :lists.keyfind(handler(handler, :id), handler(:id) + 1, handlers) do
-      false ->
-        case do_handler(module, :init, [arg]) do
-          {:ok, res} ->
-            case res do
-              {:ok, state} ->
-                {false, succ, [handler(handler, state: state) | handlers]}
-
-              {:ok, state, :hibernate} ->
-                {true, succ, [handler(handler, state: state) | handlers]}
-
-              {:error, _} = error ->
-                {false, error, handlers}
-
-              other ->
-                {false, {:error, {:bad_return_value, other}}, handlers}
-            end
-
-          {:error, _} = error ->
-            {false, error, handlers}
-        end
-
-      _ ->
-        {false, {:error, :already_present}, handlers}
-    end
-  end
-
-  defp do_take_handler(module, args, handlers, name, last_in, reason) do
-    case :lists.keytake(module, handler(:id) + 1, handlers) do
-      {:value, handler, handlers} ->
-        {do_terminate(handler, args, last_in, name, reason), handlers}
-
-      false ->
-        {{:error, :not_found}, handlers}
-    end
-  end
-
-  defp do_terminate(handler, arg, last_in, name, reason) do
-    handler(module: module, state: state) = handler
-
-    res =
-      case do_handler(module, :terminate, [arg, state]) do
-        {:ok, res} -> res
-        {:error, _} = error -> error
-      end
-
-    report_terminate(handler, reason, state, last_in, name)
-    res
-  end
-
-  defp do_handler(mod, fun, args) do
-    try do
-      apply(mod, fun, args)
-    catch
-      :throw, val -> {:ok, val}
-      :error, val -> {:error, {val, __STACKTRACE__}}
-      :exit, val -> {:error, val}
-    else
-      res -> {:ok, res}
-    end
-  end
-
-  defp report_terminate(handler, reason, state, last_in, name) do
-    report_error(handler, reason, state, last_in, name)
-
-    if ref = handler(handler, :ref) do
-      Process.demonitor(ref, [:flush])
-    end
-
-    if pid = handler(handler, :pid) do
-      send(pid, {:gen_event_EXIT, handler(handler, :id), reason})
-    end
-  end
-
-  defp report_error(_handler, :normal, _, _, _), do: :ok
-  defp report_error(_handler, :shutdown, _, _, _), do: :ok
-  defp report_error(_handler, {:swapped, _, _}, _, _, _), do: :ok
-
-  defp report_error(handler, reason, state, last_in, name) do
-    reason =
-      case reason do
-        {:undef, [{m, f, a, _} | _] = mfas} ->
-          cond do
-            :code.is_loaded(m) == false ->
-              {:"module could not be loaded", mfas}
-
-            function_exported?(m, f, length(a)) ->
-              reason
-
-            true ->
-              {:"function not exported", mfas}
-          end
-
-        _ ->
-          reason
-      end
-
-    formatted = report_status(handler, state)
-
-    :error_logger.error_msg(
-      '** gen_event handler ~p crashed.~n' ++
-        '** Was installed in ~p~n' ++
-        '** Last event was: ~p~n' ++ '** When handler state == ~p~n' ++ '** Reason == ~p~n',
-      [handler(handler, :id), name, last_in, formatted, reason]
-    )
-  end
-
-  defp report_status(handler(module: module), state) do
-    if function_exported?(module, :format_status, 2) do
-      try do
-        module.format_status(:terminate, [Process.get(), state])
-      catch
-        _, _ -> state
-      end
-    else
-      state
-    end
-  end
-end
@@ -1,171 +0,0 @@
-defmodule GenEvent.Stream do
-  @moduledoc false
-  defstruct manager: nil, timeout: :infinity
-
-  @type t :: %__MODULE__{manager: GenEvent.manager(), timeout: timeout}
-
-  @doc false
-  def init({_pid, _ref} = state) do
-    {:ok, state}
-  end
-
-  @doc false
-  def handle_event(event, _state) do
-    # We do this to trick Dialyzer to not complain about non-local returns.
-    case :erlang.phash2(1, 1) do
-      0 -> exit({:bad_event, event})
-      1 -> :remove_handler
-    end
-  end
-
-  @doc false
-  def handle_call(msg, _state) do
-    # We do this to trick Dialyzer to not complain about non-local returns.
-    reason = {:bad_call, msg}
-
-    case :erlang.phash2(1, 1) do
-      0 -> exit(reason)
-      1 -> {:remove_handler, reason}
-    end
-  end
-
-  @doc false
-  def handle_info(_msg, state) do
-    {:ok, state}
-  end
-
-  @doc false
-  def terminate(_reason, _state) do
-    :ok
-  end
-
-  @doc false
-  def code_change(_old, state, _extra) do
-    {:ok, state}
-  end
-end
-
-defimpl Enumerable, for: GenEvent.Stream do
-  def reduce(stream, acc, fun) do
-    start_fun = fn -> start(stream) end
-    next_fun = &next(stream, &1)
-    stop_fun = &stop(stream, &1)
-    Stream.resource(start_fun, next_fun, stop_fun).(acc, wrap_reducer(fun))
-  end
-
-  def count(_stream) do
-    {:error, __MODULE__}
-  end
-
-  def member?(_stream, _item) do
-    {:error, __MODULE__}
-  end
-
-  def slice(_stream) do
-    {:error, __MODULE__}
-  end
-
-  defp wrap_reducer(fun) do
-    fn
-      {:ack, manager, ref, event}, acc ->
-        send(manager, {ref, :ok})
-        fun.(event, acc)
-
-      {:async, _manager, _ref, event}, acc ->
-        fun.(event, acc)
-
-      {:sync, manager, ref, event}, acc ->
-        try do
-          fun.(event, acc)
-        after
-          send(manager, {ref, :ok})
-        end
-    end
-  end
-
-  defp start(%{manager: manager} = stream) do
-    try do
-      {:ok, {pid, ref}} =
-        :gen.call(manager, self(), {:add_process_handler, self(), self()}, :infinity)
-
-      mon_ref = Process.monitor(pid)
-      {pid, ref, mon_ref}
-    catch
-      :exit, reason -> exit({reason, {__MODULE__, :start, [stream]}})
-    end
-  end
-
-  defp next(%{timeout: timeout} = stream, {pid, ref, mon_ref} = acc) do
-    self = self()
-
-    receive do
-      # Got an async event.
-      {_from, {^pid, ^ref}, {:notify, event}} ->
-        {[{:async, pid, ref, event}], acc}
-
-      # Got a sync event.
-      {_from, {^pid, ^ref}, {:sync_notify, event}} ->
-        {[{:sync, pid, ref, event}], acc}
-
-      # Got an ack event.
-      {_from, {^pid, ^ref}, {:ack_notify, event}} ->
-        {[{:ack, pid, ref, event}], acc}
-
-      # The handler was removed. Stop iteration, resolve the
-      # event later. We need to demonitor now, otherwise DOWN
-      # appears with higher priority in the shutdown process.
-      {:gen_event_EXIT, {^pid, ^ref}, _reason} = event ->
-        Process.demonitor(mon_ref, [:flush])
-        send(self, event)
-        {:halt, {:removed, acc}}
-
-      # The manager died. Stop iteration, resolve the event later.
-      {:DOWN, ^mon_ref, _, _, _} = event ->
-        send(self, event)
-        {:halt, {:removed, acc}}
-    after
-      timeout ->
-        exit({:timeout, {__MODULE__, :next, [stream, acc]}})
-    end
-  end
-
-  # If we reach this branch, we know the handler was already
-  # removed, so we don't trigger a request for doing so.
-  defp stop(stream, {:removed, {pid, ref, mon_ref} = acc}) do
-    case wait_for_handler_removal(pid, ref, mon_ref) do
-      :ok ->
-        flush_events(ref)
-
-      {:error, reason} ->
-        exit({reason, {__MODULE__, :stop, [stream, acc]}})
-    end
-  end
-
-  # If we reach this branch, the handler was not removed yet,
-  # so we trigger a request for doing so.
-  defp stop(stream, {pid, ref, _} = acc) do
-    _ = :gen_event.delete_handler(pid, {pid, ref}, :shutdown)
-    stop(stream, {:removed, acc})
-  end
-
-  defp wait_for_handler_removal(pid, ref, mon_ref) do
-    receive do
-      {:gen_event_EXIT, {^pid, ^ref}, _reason} ->
-        Process.demonitor(mon_ref, [:flush])
-        :ok
-
-      {:DOWN, ^mon_ref, _, _, reason} ->
-        {:error, reason}
-    end
-  end
-
-  defp flush_events(ref) do
-    receive do
-      {_from, {_pid, ^ref}, {notify, _event}}
-      when notify in [:notify, :ack_notify, :sync_notify] ->
-        flush_events(ref)
-    after
-      0 -> :ok
-    end
-  end
-end
@@ -0,0 +1,48 @@
+defmodule GenServer.Behavior do
+  @doc """
+  By using this module, you get default GenServer callbacks
+  for `handle_call`, `handle_info`, `handle_cast`, `terminate`
+  and `code_change`. `init` still needs to be implemented by the
+  developer. Since these functions are defined as overridable,
+  they can be partially customized and have a global clause
+  that simply invokes `super`. See `ExUnit.Server` for some
+  code examples.
+
+  This module also tags the behavior as :gen_server. For more
+  information on gen_server, please refer to the Erlang
+  documentation:
+
+  http://www.erlang.org/doc/man/gen_server.html
+  http://www.erlang.org/doc/design_principles/gen_server_concepts.html
+
+  """
+  defmacro __using__(_) do
+    quote location: :keep do
+      @behavior :gen_server
+
+      def handle_call(_request, _from, state) do
+        { :reply, :undef, state }
+      end
+
+      def handle_info(_msg, state) do
+        { :noreply, state }
+      end
+
+      def handle_cast(_msg, state) do
+        { :noreply, state }
+      end
+
+      def terminate(reason, state) do
+        :error_logger.error_report('#{inspect __MODULE__} crashed:\n#{inspect reason}')
+        :error_logger.error_report('#{inspect __MODULE__} snapshot:\n#{inspect state}')
+        :ok
+      end
+
+      def code_change(_old, state, _extra) do
+        { :ok, state }
+      end
+
+      defoverridable [handle_call: 3, handle_info: 2, handle_cast: 2, terminate: 2, code_change: 3]
+    end
+  end
+end
@@ -1,309 +1,81 @@
+defimpl Dict, for: HashDict do
+  defmacrop dict(data) do
+    quote do
+      { HashDict, unquote(data) }
+    end
+  end
+
+  def keys(dict(data)) do
+    :dict.fetch_keys data
+  end
+
+  def values(dict(data)) do
+    :dict.fold fn _key, value, acc ->
+      [value|acc]
+    end, [], data
+  end
+
+  def size(dict(data)) do
+    :dict.size data
+  end
+
+  def has_key?(dict(data), key) do
+    :dict.is_key key, data
+  end
+
+  def get(dict(data), key, default // nil) do
+    case :dict.find(key, data) do
+      {:ok, value} ->
+        value
+      :error ->
+        default
+    end
+  end
+
+  def put(dict(data), key, value) do
+    dict(:dict.store key, value, data)
+  end
+
+  def delete(dict(data), key) do
+    dict(:dict.erase key, data)
+  end
+
+  def merge(dict(d1), dict(d2)) do
+    dict(:dict.merge fn _k, _v1, v2 -> v2 end, d1, d2)
+  end
+
+  def merge(dict(d1), dict(d2), fun) do
+    dict(:dict.merge fun, d1, d2)
+  end
+
+  def update(dict(data), key, fun) do
+    dict(:dict.update key, fun, data)
+  end
+
+  def update(dict(data), key, initial, fun) do
+    dict(:dict.update key, fun, initial, data)
+  end
+
+  def empty(_) do
+    dict(:dict.new)
+  end
+
+  def to_list(dict(data)) do
+    :dict.to_list data
+  end
+end
+
+defimpl Enum.Iterator, for: HashDict do
+  def iterator({ HashDict, data }), do: :dict.to_list(data)
+  def count({ HashDict, data }), do: :dict.size(data)
+end
+
 defmodule HashDict do
  @moduledoc """
-  Tuple-based HashDict implementation.
-
-  This module is deprecated. Use the `Map` module instead.
+  This module implements a dictionary based on hashing of the keys.
+  It is a simple wrapper around [Erlang's dict module](http://www.erlang.org/doc/man/dict.html)
+  and exposed via the `Dict` protocol.
  """

-  @moduledoc deprecated: "Use Map instead"
-
-  use Dict
-
-  @node_bitmap 0b111
-  @node_shift 3
-  @node_size 8
-  @node_template :erlang.make_tuple(@node_size, [])
-
-  @opaque t :: %__MODULE__{size: non_neg_integer, root: term}
-  @doc false
-  defstruct size: 0, root: @node_template
-
-  # Inline common instructions
-  @compile :inline_list_funcs
-  @compile {:inline, key_hash: 1, key_mask: 1, key_shift: 1}
-
-  message = "Use maps and the Map module instead"
-
-  @doc """
-  Creates a new empty dict.
-  """
-  @spec new :: Dict.t()
-  @deprecated message
-  def new do
-    %HashDict{}
-  end
-
-  @deprecated message
-  def put(%HashDict{root: root, size: size}, key, value) do
-    {root, counter} = do_put(root, key, value, key_hash(key))
-    %HashDict{root: root, size: size + counter}
-  end
-
-  @deprecated message
-  def update!(%HashDict{root: root, size: size} = dict, key, fun) when is_function(fun, 1) do
-    {root, counter} =
-      do_update(root, key, fn -> raise KeyError, key: key, term: dict end, fun, key_hash(key))
-
-    %HashDict{root: root, size: size + counter}
-  end
-
-  @deprecated message
-  def update(%HashDict{root: root, size: size}, key, default, fun) when is_function(fun, 1) do
-    {root, counter} = do_update(root, key, fn -> default end, fun, key_hash(key))
-    %HashDict{root: root, size: size + counter}
-  end
-
-  @deprecated message
-  def fetch(%HashDict{root: root}, key) do
-    do_fetch(root, key, key_hash(key))
-  end
-
-  @deprecated message
-  def delete(dict, key) do
-    case dict_delete(dict, key) do
-      {dict, _value} -> dict
-      :error -> dict
-    end
-  end
-
-  @deprecated message
-  def pop(dict, key, default \\ nil) do
-    case dict_delete(dict, key) do
-      {dict, value} -> {value, dict}
-      :error -> {default, dict}
-    end
-  end
-
-  @deprecated message
-  def size(%HashDict{size: size}) do
-    size
-  end
-
-  @doc false
-  @deprecated message
-  def reduce(%HashDict{root: root}, acc, fun) do
-    do_reduce(root, acc, fun, @node_size, fn
-      {:suspend, acc} -> {:suspended, acc, &{:done, elem(&1, 1)}}
-      {:halt, acc} -> {:halted, acc}
-      {:cont, acc} -> {:done, acc}
-    end)
-  end
-
-  ## General helpers
-
-  @doc false
-  def dict_delete(%HashDict{root: root, size: size}, key) do
-    case do_delete(root, key, key_hash(key)) do
-      {root, value} -> {%HashDict{root: root, size: size - 1}, value}
-      :error -> :error
-    end
-  end
-
-  ## Dict manipulation
-
-  defp do_fetch(node, key, hash) do
-    index = key_mask(hash)
-
-    case elem(node, index) do
-      [^key | v] -> {:ok, v}
-      {^key, v, _} -> {:ok, v}
-      {_, _, n} -> do_fetch(n, key, key_shift(hash))
-      _ -> :error
-    end
-  end
-
-  defp do_put(node, key, value, hash) do
-    index = key_mask(hash)
-
-    case elem(node, index) do
-      [] ->
-        {put_elem(node, index, [key | value]), 1}
-
-      [^key | _] ->
-        {put_elem(node, index, [key | value]), 0}
-
-      [k | v] ->
-        n = put_elem(@node_template, key_mask(key_shift(hash)), [key | value])
-        {put_elem(node, index, {k, v, n}), 1}
-
-      {^key, _, n} ->
-        {put_elem(node, index, {key, value, n}), 0}
-
-      {k, v, n} ->
-        {n, counter} = do_put(n, key, value, key_shift(hash))
-        {put_elem(node, index, {k, v, n}), counter}
-    end
-  end
-
-  defp do_update(node, key, default, fun, hash) do
-    index = key_mask(hash)
-
-    case elem(node, index) do
-      [] ->
-        {put_elem(node, index, [key | default.()]), 1}
-
-      [^key | value] ->
-        {put_elem(node, index, [key | fun.(value)]), 0}
-
-      [k | v] ->
-        n = put_elem(@node_template, key_mask(key_shift(hash)), [key | default.()])
-        {put_elem(node, index, {k, v, n}), 1}
-
-      {^key, value, n} ->
-        {put_elem(node, index, {key, fun.(value), n}), 0}
-
-      {k, v, n} ->
-        {n, counter} = do_update(n, key, default, fun, key_shift(hash))
-        {put_elem(node, index, {k, v, n}), counter}
-    end
-  end
-
-  defp do_delete(node, key, hash) do
-    index = key_mask(hash)
-
-    case elem(node, index) do
-      [] ->
-        :error
-
-      [^key | value] ->
-        {put_elem(node, index, []), value}
-
-      [_ | _] ->
-        :error
-
-      {^key, value, n} ->
-        {put_elem(node, index, do_compact_node(n)), value}
-
-      {k, v, n} ->
-        case do_delete(n, key, key_shift(hash)) do
-          {@node_template, value} ->
-            {put_elem(node, index, [k | v]), value}
-
-          {n, value} ->
-            {put_elem(node, index, {k, v, n}), value}
-
-          :error ->
-            :error
-        end
-    end
-  end
-
-  Enum.each(0..(@node_size - 1), fn index ->
-    defp do_compact_node(node) when elem(node, unquote(index)) != [] do
-      case elem(node, unquote(index)) do
-        [k | v] ->
-          case put_elem(node, unquote(index), []) do
-            @node_template -> [k | v]
-            n -> {k, v, n}
-          end
-
-        {k, v, n} ->
-          {k, v, put_elem(node, unquote(index), do_compact_node(n))}
-      end
-    end
-  end)
-
-  ## Dict reduce
-
-  defp do_reduce_each(_node, {:halt, acc}, _fun, _next) do
-    {:halted, acc}
-  end
-
-  defp do_reduce_each(node, {:suspend, acc}, fun, next) do
-    {:suspended, acc, &do_reduce_each(node, &1, fun, next)}
-  end
-
-  defp do_reduce_each([], acc, _fun, next) do
-    next.(acc)
-  end
-
-  defp do_reduce_each([k | v], {:cont, acc}, fun, next) do
-    next.(fun.({k, v}, acc))
-  end
-
-  defp do_reduce_each({k, v, n}, {:cont, acc}, fun, next) do
-    do_reduce(n, fun.({k, v}, acc), fun, @node_size, next)
-  end
-
-  defp do_reduce(node, acc, fun, count, next) when count > 0 do
-    do_reduce_each(
-      :erlang.element(count, node),
-      acc,
-      fun,
-      &do_reduce(node, &1, fun, count - 1, next)
-    )
-  end
-
-  defp do_reduce(_node, acc, _fun, 0, next) do
-    next.(acc)
-  end
-
-  ## Key operations
-
-  import Bitwise
-
-  defp key_hash(key) do
-    :erlang.phash2(key)
-  end
-
-  defp key_mask(hash) do
-    hash &&& @node_bitmap
-  end
-
-  defp key_shift(hash) do
-    hash >>> @node_shift
-  end
-end
-
-defimpl Enumerable, for: HashDict do
-  def reduce(dict, acc, fun) do
-    # Avoid warnings about HashDict being deprecated.
-    module = HashDict
-    module.reduce(dict, acc, fun)
-  end
-
-  def member?(dict, {key, value}) do
-    # Avoid warnings about HashDict being deprecated.
-    module = HashDict
-    {:ok, match?({:ok, ^value}, module.fetch(dict, key))}
-  end
-
-  def member?(_dict, _) do
-    {:ok, false}
-  end
-
-  def count(dict) do
-    # Avoid warnings about HashDict being deprecated.
-    module = HashDict
-    {:ok, module.size(dict)}
-  end
-
-  def slice(_dict) do
-    {:error, __MODULE__}
-  end
-end
-
-defimpl Collectable, for: HashDict do
-  def into(original) do
-    # Avoid warnings about HashDict being deprecated.
-    module = HashDict
-
-    collector_fun = fn
-      dict, {:cont, {key, value}} -> module.put(dict, key, value)
-      dict, :done -> dict
-      _, :halt -> :ok
-    end
-
-    {original, collector_fun}
-  end
-end
-
-defimpl Inspect, for: HashDict do
-  import Inspect.Algebra
-
-  def inspect(dict, opts) do
-    # Avoid warnings about HashDict being deprecated.
-    module = HashDict
-    concat(["#HashDict<", Inspect.List.inspect(module.to_list(dict), opts), ">"])
-  end
+  use Dict.Common, Dict.HashDict
 end
@@ -1,319 +0,0 @@
-defmodule HashSet do
-  @moduledoc """
-  Tuple-based HashSet implementation.
-
-  This module is deprecated. Use the `MapSet` module instead.
-  """
-
-  @moduledoc deprecated: "Use MapSet instead"
-
-  @node_bitmap 0b111
-  @node_shift 3
-  @node_size 8
-  @node_template :erlang.make_tuple(@node_size, [])
-
-  message = "Use the MapSet module instead"
-
-  @opaque t :: %__MODULE__{size: non_neg_integer, root: term}
-  @doc false
-  defstruct size: 0, root: @node_template
-
-  # Inline common instructions
-  @compile :inline_list_funcs
-  @compile {:inline, key_hash: 1, key_mask: 1, key_shift: 1}
-
-  @deprecated message
-  @spec new :: Set.t()
-  def new do
-    %HashSet{}
-  end
-
-  @deprecated message
-  def union(%HashSet{size: size1} = set1, %HashSet{size: size2} = set2) when size1 <= size2 do
-    set_fold(set1, set2, fn v, acc -> put(acc, v) end)
-  end
-
-  @deprecated message
-  def union(%HashSet{} = set1, %HashSet{} = set2) do
-    set_fold(set2, set1, fn v, acc -> put(acc, v) end)
-  end
-
-  @deprecated message
-  def intersection(%HashSet{} = set1, %HashSet{} = set2) do
-    set_fold(set1, %HashSet{}, fn v, acc ->
-      if member?(set2, v), do: put(acc, v), else: acc
-    end)
-  end
-
-  @deprecated message
-  def difference(%HashSet{} = set1, %HashSet{} = set2) do
-    set_fold(set2, set1, fn v, acc -> delete(acc, v) end)
-  end
-
-  @deprecated message
-  def to_list(set) do
-    set_fold(set, [], &[&1 | &2]) |> :lists.reverse()
-  end
-
-  @deprecated message
-  def equal?(%HashSet{size: size1} = set1, %HashSet{size: size2} = set2) do
-    case size1 do
-      ^size2 -> subset?(set1, set2)
-      _ -> false
-    end
-  end
-
-  @deprecated message
-  def subset?(%HashSet{} = set1, %HashSet{} = set2) do
-    reduce(set1, {:cont, true}, fn member, acc ->
-      case member?(set2, member) do
-        true -> {:cont, acc}
-        _ -> {:halt, false}
-      end
-    end)
-    |> elem(1)
-  end
-
-  @deprecated message
-  def disjoint?(%HashSet{} = set1, %HashSet{} = set2) do
-    reduce(set2, {:cont, true}, fn member, acc ->
-      case member?(set1, member) do
-        false -> {:cont, acc}
-        _ -> {:halt, false}
-      end
-    end)
-    |> elem(1)
-  end
-
-  @deprecated message
-  def member?(%HashSet{root: root}, term) do
-    do_member?(root, term, key_hash(term))
-  end
-
-  @deprecated message
-  def put(%HashSet{root: root, size: size}, term) do
-    {root, counter} = do_put(root, term, key_hash(term))
-    %HashSet{root: root, size: size + counter}
-  end
-
-  @deprecated message
-  def delete(%HashSet{root: root, size: size} = set, term) do
-    case do_delete(root, term, key_hash(term)) do
-      {:ok, root} -> %HashSet{root: root, size: size - 1}
-      :error -> set
-    end
-  end
-
-  @doc false
-  def reduce(%HashSet{root: root}, acc, fun) do
-    do_reduce(root, acc, fun, @node_size, fn
-      {:suspend, acc} -> {:suspended, acc, &{:done, elem(&1, 1)}}
-      {:halt, acc} -> {:halted, acc}
-      {:cont, acc} -> {:done, acc}
-    end)
-  end
-
-  @deprecated message
-  def size(%HashSet{size: size}) do
-    size
-  end
-
-  ## Set helpers
-
-  defp set_fold(%HashSet{root: root}, acc, fun) do
-    do_fold(root, acc, fun, @node_size)
-  end
-
-  ## Set manipulation
-
-  defp do_member?(node, term, hash) do
-    index = key_mask(hash)
-
-    case elem(node, index) do
-      [] -> false
-      [^term | _] -> true
-      [_] -> false
-      [_ | n] -> do_member?(n, term, key_shift(hash))
-    end
-  end
-
-  defp do_put(node, term, hash) do
-    index = key_mask(hash)
-
-    case elem(node, index) do
-      [] ->
-        {put_elem(node, index, [term]), 1}
-
-      [^term | _] ->
-        {node, 0}
-
-      [t] ->
-        n = put_elem(@node_template, key_mask(key_shift(hash)), [term])
-        {put_elem(node, index, [t | n]), 1}
-
-      [t | n] ->
-        {n, counter} = do_put(n, term, key_shift(hash))
-        {put_elem(node, index, [t | n]), counter}
-    end
-  end
-
-  defp do_delete(node, term, hash) do
-    index = key_mask(hash)
-
-    case elem(node, index) do
-      [] ->
-        :error
-
-      [^term] ->
-        {:ok, put_elem(node, index, [])}
-
-      [_] ->
-        :error
-
-      [^term | n] ->
-        {:ok, put_elem(node, index, do_compact_node(n))}
-
-      [t | n] ->
-        case do_delete(n, term, key_shift(hash)) do
-          {:ok, @node_template} ->
-            {:ok, put_elem(node, index, [t])}
-
-          {:ok, n} ->
-            {:ok, put_elem(node, index, [t | n])}
-
-          :error ->
-            :error
-        end
-    end
-  end
-
-  Enum.each(0..(@node_size - 1), fn index ->
-    defp do_compact_node(node) when elem(node, unquote(index)) != [] do
-      case elem(node, unquote(index)) do
-        [t] ->
-          case put_elem(node, unquote(index), []) do
-            @node_template -> [t]
-            n -> [t | n]
-          end
-
-        [t | n] ->
-          [t | put_elem(node, unquote(index), do_compact_node(n))]
-      end
-    end
-  end)
-
-  ## Set fold
-
-  defp do_fold_each([], acc, _fun), do: acc
-  defp do_fold_each([t], acc, fun), do: fun.(t, acc)
-  defp do_fold_each([t | n], acc, fun), do: do_fold(n, fun.(t, acc), fun, @node_size)
-
-  defp do_fold(node, acc, fun, count) when count > 0 do
-    acc = do_fold_each(:erlang.element(count, node), acc, fun)
-    do_fold(node, acc, fun, count - 1)
-  end
-
-  defp do_fold(_node, acc, _fun, 0) do
-    acc
-  end
-
-  ## Set reduce
-
-  defp do_reduce_each(_node, {:halt, acc}, _fun, _next) do
-    {:halted, acc}
-  end
-
-  defp do_reduce_each(node, {:suspend, acc}, fun, next) do
-    {:suspended, acc, &do_reduce_each(node, &1, fun, next)}
-  end
-
-  defp do_reduce_each([], acc, _fun, next) do
-    next.(acc)
-  end
-
-  defp do_reduce_each([t], {:cont, acc}, fun, next) do
-    next.(fun.(t, acc))
-  end
-
-  defp do_reduce_each([t | n], {:cont, acc}, fun, next) do
-    do_reduce(n, fun.(t, acc), fun, @node_size, next)
-  end
-
-  defp do_reduce(node, acc, fun, count, next) when count > 0 do
-    do_reduce_each(
-      :erlang.element(count, node),
-      acc,
-      fun,
-      &do_reduce(node, &1, fun, count - 1, next)
-    )
-  end
-
-  defp do_reduce(_node, acc, _fun, 0, next) do
-    next.(acc)
-  end
-
-  ## Key operations
-
-  import Bitwise
-
-  defp key_hash(key) do
-    :erlang.phash2(key)
-  end
-
-  defp key_mask(hash) do
-    hash &&& @node_bitmap
-  end
-
-  defp key_shift(hash) do
-    hash >>> @node_shift
-  end
-end
-
-defimpl Enumerable, for: HashSet do
-  def reduce(set, acc, fun) do
-    # Avoid warnings about HashSet being deprecated.
-    module = HashSet
-    module.reduce(set, acc, fun)
-  end
-
-  def member?(set, term) do
-    # Avoid warnings about HashSet being deprecated.
-    module = HashSet
-    {:ok, module.member?(set, term)}
-  end
-
-  def count(set) do
-    # Avoid warnings about HashSet being deprecated.
-    module = HashSet
-    {:ok, module.size(set)}
-  end
-
-  def slice(_set) do
-    {:error, __MODULE__}
-  end
-end
-
-defimpl Collectable, for: HashSet do
-  def into(original) do
-    # Avoid warnings about HashSet being deprecated.
-    module = HashSet
-
-    collector_fun = fn
-      set, {:cont, term} -> module.put(set, term)
-      set, :done -> set
-      _, :halt -> :ok
-    end
-
-    {original, collector_fun}
-  end
-end
-
-defimpl Inspect, for: HashSet do
-  import Inspect.Algebra
-
-  def inspect(set, opts) do
-    # Avoid warnings about HashSet being deprecated.
-    module = HashSet
-    concat(["#HashSet<", Inspect.List.inspect(module.to_list(set), opts), ">"])
-  end
-end
@@ -0,0 +1,212 @@
+defrecord IEx.Config, io: nil, binding: nil, cache: '', counter: 1, scope: nil, result: nil
+
+defmodule IEx do
+  @moduledoc """
+  This module implements interactive Elixir. It provides a main
+  function, `start` which will either delegate to `tty` or `simple`.
+  The former is meant for systems where tty is available and relies
+  on it in order to work properly. This makes all control commands
+  available in tty available to the developer.
+
+  In case `tty` is not available (for example, Windows), a
+  developer may invoke `simple` which starts a stripped
+  down version.
+  """
+
+  import Exception, only: [format_stacktrace: 1]
+
+  @doc """
+  Interface to start IEx from CLI.
+  """
+  def cli do
+    run([remsh: get_remsh(:init.get_plain_arguments)])
+  end
+
+  defp get_remsh(['--remsh',h|_]), do: list_to_binary(h)
+  defp get_remsh([_|t]), do: get_remsh(t)
+  defp get_remsh([]),    do: nil
+
+  @doc """
+  Runs IEx checking if tty is available or not.
+  If so, invoke tty, otherwise go with the simple iex.
+  """
+  def run(opts // []) when is_list(opts) do
+    case :os.type do
+      { :unix, _ } -> tty(opts)
+      _            -> simple(opts)
+    end
+  end
+
+  @doc """
+  Starts IEx using a tty server.
+  """
+  def tty(opts // []) when is_list(opts) do
+    config = boot_config(opts)
+
+    remote =
+      if remsh = opts[:remsh] do
+        if node() == :nonode@nohost do
+          raise ArgumentError, message: "In order to use --remsh, you need to name the node"
+        end
+        if is_atom(remsh), do: remsh, else: binary_to_atom(remsh)
+      end
+
+    function = fn ->
+      # We are inside the new tty and in a new process,
+      # reattach it the error logger.
+      attach_error_logger
+
+      start config
+    end
+
+    # Dettach the error logger because we are going to unregister
+    # the user process and start a new tty which will get control
+    # over the standardio. Dettaching it here allows us to get rid
+    # of warnings. We reattach it again when we get the new tty.
+    dettach_error_logger
+
+    # Unregister the user process, user_drv command below
+    # will register the new one.
+    unregister_user_process
+
+    # Close the default io port, user_drv start command below
+    # will take control over the io.
+    close_io_port
+
+    args =
+      if remote do
+        { remote, :erlang, :apply, [function, []] }
+      else
+        { :erlang, :apply, [function, []] }
+      end
+
+    Erlang.user_drv.start([:"tty_sl -c -e", args])
+  end
+
+  @doc """
+  Starts IEx simply using the current stdio.
+  """
+  def simple(opts // []) when is_list(opts) do
+    start boot_config(opts)
+  end
+
+  # This is a callback invoked by Erlang shell utilities.
+  @doc false
+  def start(config // nil) do
+    spawn fn ->
+      config = config || boot_config([])
+      gl = :erlang.group_leader
+      glnode = node gl
+      if glnode != node do
+        ensure_module_exists glnode, IEx.Remsh
+        expand_fun = IEx.Remsh.expand node
+      else
+        expand_fun = IEx.Autocomplete.expand &1
+      end
+      :io.setopts gl, [expand_fun: expand_fun]
+      start_loop(config)
+    end
+  end
+
+  ## Boot Helpers
+
+  defp boot_config(opts) do
+    IO.puts "Interactive Elixir (#{System.version}) - press Ctrl+C to exit"
+
+    scope  = Erlang.elixir.scope_for_eval(
+      file: 'iex',
+      delegate_locals_to: IEx.Helpers
+    )
+
+    IEx.Config[
+      io: opts[:io] || IEx.UnicodeIO,
+      binding: opts[:binding] || [],
+      scope: scope
+    ]
+  end
+
+  defp dettach_error_logger do
+    :error_logger.delete_report_handler(:error_logger_tty_h)
+  end
+
+  defp attach_error_logger do
+    :error_logger.add_report_handler(:error_logger_tty_h)
+  end
+
+  defp unregister_user_process do
+    if is_pid(Process.whereis(:user)), do: Process.unregister :user
+  end
+
+  defp close_io_port do
+    if port = Enum.find(Port.list, io_port?(&1)) do
+      Port.close(port)
+    end
+  end
+
+  defp io_port?(port) do
+    Port.info(port, :name) == {:name,'0/1'} && port
+  end
+
+  ## Loop helpers
+
+  defp start_loop(config) do
+    Process.put :iex_history, []
+    { _, _, scope } = Erlang.elixir.eval('import IEx.Helpers', [], 0, config.scope)
+    do_loop(config.scope(scope))
+  end
+
+  defp do_loop(config) do
+    io = config.io
+
+    counter = config.counter
+    cache   = config.cache
+    code    = cache ++ io.get(config)
+
+    new_config =
+      try do
+        { result, new_binding, scope } =
+          Erlang.elixir.eval(code, config.binding, counter, config.scope)
+
+        io.put result
+
+        config = config.result(result)
+        update_history(config.cache(code).scope(nil))
+        config.increment_counter.cache('').binding(new_binding).scope(scope)
+      rescue
+        TokenMissingError ->
+          config.cache(code)
+        exception ->
+          stacktrace = System.stacktrace
+          io.error "** (#{inspect exception.__record__(:name)}) #{exception.message}"
+          print_stacktrace io, stacktrace
+          config.cache('')
+      catch
+        kind, error ->
+          stacktrace = System.stacktrace
+          io.error "** (#{kind}) #{inspect(error)}"
+          print_stacktrace io, stacktrace
+          config.cache('')
+      end
+
+    do_loop(new_config)
+  end
+
+  defp update_history(config) do
+    current = Process.get :iex_history
+    Process.put :iex_history, [config|current]
+  end
+
+  defp print_stacktrace(io, stacktrace) do
+    Enum.each stacktrace, fn s -> io.error "    #{format_stacktrace(s)}" end
+  end
+
+  ## Code injection helper
+
+  defp ensure_module_exists(node, mod) do
+    unless :rpc.call node, :code, :is_loaded, [mod] do
+      {m,b,f} = :code.get_object_code mod
+      {:module, mod} = :rpc.call node, :code, :load_binary, [m,f,b]
+    end
+  end
+end
+
@@ -0,0 +1,266 @@
+defmodule IEx.Autocomplete do
+  @moduledoc """
+  Autocompletion for the Elixir shell.
+  """
+
+  defrecord Mod, name: nil, type: nil
+  defrecord Fun, name: nil, arities: []
+
+  defprotocol Entry do
+    @moduledoc false
+    def to_entries(entry)
+    def to_hint(entry, hint)
+  end
+
+  defimpl Entry, for: Mod do
+    def to_entries(mod) do
+      [mod.name]
+    end
+
+    def to_hint(Mod[name: name], hint) do
+      :lists.nthtail(length(hint), name) ++ '.'
+    end
+  end
+
+  defimpl Entry, for: Fun do
+    def to_entries(fun) do
+      lc a inlist fun.arities, do: '#{fun.name}/#{a}'
+    end
+
+    def to_hint(Fun[name: name], hint) do
+      :lists.nthtail(length(hint), name)
+    end
+  end
+
+  def expand([]) do
+    funs = module_funs(IEx.Helpers) ++ module_funs(Kernel)
+    mods = [Mod[name: 'Elixir', type: :elixir], Mod[name: 'Erlang', type: :elixir]]
+    format_expansion mods ++ funs
+  end
+
+  def expand([h|t]=expr) do
+    cond do
+      h === ?. ->
+        expand_dot reduce(t)
+      h === ?: ->
+        expand_erlang_modules
+      (h in ?a..?z) or (h in ?A..?Z) or h === ?_ ->
+        expand_expr reduce(expr)
+      h in '(+[' ->
+        expand ''
+      true ->
+        no_match
+    end
+  end
+
+  defp expand_dot(expr) do
+    case Code.string_to_ast expr do
+      {:ok, atom} when is_atom(atom) ->
+        expand_module_funs atom
+      {:ok, {:__aliases__,_,[:Erlang]}} ->
+        expand_erlang_modules
+      {:ok, {:__aliases__,_,list}} ->
+        expand_elixir_modules list
+      {:ok, {{:.,_,[{:__aliases__,_,[:Erlang]},mod]},_,[]}} when is_atom(mod) ->
+        expand_module_funs mod
+      _ ->
+        no_match
+    end
+  end
+
+  defp expand_expr(expr) do
+    case Code.string_to_ast expr do
+      {:ok, atom} when is_atom(atom) ->
+        expand_erlang_modules atom_to_list(atom)
+      {:ok, { atom, _, nil }} when is_atom(atom) ->
+        expand_module_funs Kernel, atom_to_list(atom)
+      {:ok, {:__aliases__,_,[root]}} ->
+        expand_elixir_modules [], atom_to_list(root)
+      {:ok, {:__aliases__,_,list}} ->
+        hint = atom_to_list(List.last(list))
+        list = :lists.sublist(list, length(list)-1)
+        expand_elixir_modules list, hint
+      {:ok, {{:., _, [mod,fun]},_,[]}} when is_atom(fun) ->
+        expand_call mod, atom_to_list(fun)
+      _ -> no_match
+    end
+  end
+
+  defp reduce(expr) do
+    last_token(List.reverse(expr), [' ', '(', '[', '+', '-'])
+  end
+
+  defp last_token(s, []) do
+    s
+  end
+
+  defp last_token(s, [h|t]) do
+    last_token(List.last(:string.tokens(s, h)), t)
+  end
+
+  defp no_match, do: { :no, '', [] }
+
+  ## Formatting
+
+  defp format_expansion(list, hint // '')
+
+  defp format_expansion([], _) do
+    no_match
+  end
+
+  defp format_expansion([uniq], hint) do
+    { :yes, Entry.to_hint(uniq, hint), [] }
+  end
+
+  defp format_expansion([first|_]=entries, hint) do
+    binary = Enum.map entries, fn e -> list_to_binary(e.name) end
+    length = length hint
+    prefix = :binary.longest_common_prefix(binary)
+    if prefix == 0 or (prefix == length) do
+      {:yes, '',
+         Enum.reduce entries, [], fn e, acc -> Entry.to_entries(e) ++ acc end }
+    else
+      {:yes, :lists.sublist(first.name, 1 + length, prefix-length), [] }
+    end
+  end
+
+  ## Root Modules
+
+  defp root_modules do
+    Enum.reduce :code.all_loaded, [], fn {m,_}, acc ->
+      mod = atom_to_list(m)
+      case mod do
+        'Elixir' ++ _ ->
+          tokens = :string.tokens(mod, '-')
+          if length(tokens) === 2 do
+            [Mod.new(name: List.last(tokens), type: :elixir)|acc]
+          else
+            acc
+          end
+        _ ->
+          [Mod.new(name: mod, type: :erlang)|acc]
+      end
+    end
+  end
+
+  ## Expand calls
+
+  # :atom.fun
+  defp expand_call(mod, hint) when is_atom(mod) do
+    expand_module_funs mod, hint
+  end
+
+  # Erlang.mod.fun
+  defp expand_call({ { :., _, [{ :__aliases__, _, [:Erlang] }, mod] }, _, [] }, hint) when is_atom(mod) do
+    expand_module_funs mod, hint
+  end
+
+  # Erlang.mod
+  defp expand_call({ :__aliases__, _, [:Erlang] }, hint) do
+    expand_erlang_modules hint
+  end
+
+  # Elixir.fun
+  defp expand_call({ :__aliases__, _, list }, hint) do
+    expand_module_funs Module.concat(list), hint
+  end
+
+  defp expand_call(_, _) do
+    no_match
+  end
+
+  ## Erlang modules
+
+  defp expand_erlang_modules(hint // '') do
+    format_expansion match_erlang_modules(hint), hint
+  end
+
+  defp match_erlang_modules('') do
+    Enum.filter root_modules, fn m -> m.type === :erlang end
+  end
+
+  defp match_erlang_modules(hint) do
+    Enum.filter root_modules, fn m -> :lists.prefix(hint, m.name) end
+  end
+
+  ## Elixir modules
+
+  defp expand_elixir_modules(list, hint // '') do
+    mod = Module.concat(list)
+    format_expansion elixir_submodules(mod, hint, list == []) ++ module_funs(mod, hint), hint
+  end
+
+  defp elixir_submodules(mod, hint, root) do
+    modname = atom_to_list(mod)
+    depth   = length(:string.tokens(modname, '-')) + 1
+    base    = modname ++ [?-|hint]
+
+    Enum.reduce modules_as_lists(root), [], fn(m, acc) ->
+      if :lists.prefix(base, m) do
+        tokens = :string.tokens(m, '-')
+        if length(tokens) == depth do
+          name = List.last(tokens)
+          [Mod.new(type: :elixir, name: name)|acc]
+        else
+          acc
+        end
+      else
+        acc
+      end
+    end
+  end
+
+  defp modules_as_lists(true) do
+    ['Elixir-Elixir', 'Elixir-Erlang'] ++ modules_as_lists(false)
+  end
+
+  defp modules_as_lists(false) do
+    Enum.map(:code.all_loaded, fn({ m, _ }) -> atom_to_list(m) end)
+  end
+
+  ## Functions
+
+  defp expand_module_funs(mod, hint // '') do
+    format_expansion module_funs(mod, hint), hint
+  end
+
+  defp module_funs(mod, hint // '') do
+    case ensure_loaded(mod) do
+      { :module, _ } ->
+        falist = get_funs(mod)
+
+        list = Enum.reduce falist, [], fn {f,a}, acc ->
+          case :lists.keyfind(f, 1, acc) do
+            {f,aa} -> :lists.keyreplace(f, 1, acc, {f, [a|aa]})
+            false  -> [{f, [a]}|acc]
+          end
+        end
+
+        lc {fun, arities} inlist list, name = atom_to_list(fun), is_prefix?(hint, name) do
+          Fun[name: name, arities: arities]
+        end
+      _ ->
+        []
+    end
+  end
+
+  ## Generic Helpers
+
+  defp get_funs(mod) do
+    if function_exported?(mod, :__info__, 1) do
+      if docs = mod.__info__(:docs) do
+        lc { pair, _line, _kind, _sign, doc } inlist docs, doc != false, do: pair
+      else
+        (mod.__info__(:functions) -- [__info__: 1]) ++ mod.__info__(:macros)
+      end
+    else
+      mod.module_info(:exports)
+    end
+  end
+
+  defp is_prefix?('', _),      do: true
+  defp is_prefix?(hint, name), do: :lists.prefix(hint, name)
+
+  defp ensure_loaded(Elixir), do: { :error, :nofile }
+  defp ensure_loaded(mod),    do: Code.ensure_loaded(mod)
+end
@@ -0,0 +1,244 @@
+defmodule IEx.Helpers do
+  @moduledoc """
+  A bunch of helpers available in IEx.
+
+  * `c` - compiles a file in the given path
+  * `d` - prints documentation
+  * `h` - prints history
+  * `m` - prints loaded modules
+  * `r` - recompiles and reloads the given module's source file
+  * `v` - retrieves nth value from console
+
+  Documentation for functions in this module can be consulted
+  directly from the command line, as an example, try:
+
+    d(:c, 1)
+
+  """
+
+  @doc """
+  Expects a list of files to compile and a path
+  to write their object code to. It returns the name
+  of the compiled modules.
+
+  ## Examples
+
+      c ["foo.ex"], "ebin"
+      #=> Foo
+
+  """
+  def c(files, path // ".") do
+    tuples = Kernel.ParallelCompiler.files_to_path List.wrap(files), path
+    Enum.map tuples, elem(&1, 1)
+  end
+
+  @doc """
+  Returns the name and module of all modules loaded.
+  """
+  def m do
+    all    = Enum.map :code.all_loaded, fn { mod, file } -> { inspect(mod), file } end
+    sorted = List.sort(all)
+    size   = Enum.reduce sorted, 0, fn({ mod, _ }, acc) -> max(byte_size(mod), acc) end
+    format = "~-#{size}s ~s~n"
+
+    Enum.each sorted, fn({ mod, file }) ->
+      :io.format(format, [mod, file])
+    end
+  end
+
+  @doc """
+  Prints commands history and their result.
+  """
+  def h do
+    history = List.reverse(Process.get(:iex_history))
+    Enum.each(history, print_history(&1))
+  end
+
+  defp print_history(config) do
+    IO.puts "#{config.counter}: #{config.cache}#=> #{inspect config.result}\n"
+  end
+
+  @doc """
+  Shows the documentation for IEx.Helpers.
+  """
+  def d() do
+    d(IEx.Helpers, :all)
+  end
+
+  @doc """
+  Shows the documentation for the given module
+  or for the given function/arity pair.
+
+  ## Examples
+
+      d(Enum)
+      #=> Prints documentation for Enum
+
+  It also accepts functions in the format `fun/arity`
+  and `module.fun/arity`, for example:
+
+      d receive/1
+      d Enum.all?/2
+
+  """
+  defmacro d({ :/, _, [{ fun, _, nil }, arity] }) do
+    quote do
+      d(unquote(fun), unquote(arity))
+    end
+  end
+
+  defmacro d({ :/, _, [{ { :., _, [mod, fun] }, _, [] }, arity] }) do
+    quote do
+      d(unquote(mod), unquote(fun), unquote(arity))
+    end
+  end
+
+  defmacro d(other) do
+    quote do
+      d(unquote(other), :all)
+    end
+  end
+
+  @doc """
+  Prints the documentation for the given function and arity.
+
+  The function may either be a function defined inside `IEx.Helpers`
+  or in `Kernel`. To see functions from other module, use
+  `d/3` instead.
+
+  ## Examples
+
+      d(:d, 2)
+      #=> Prints documentation for this function
+
+  """
+  def d(:d, 1) do
+    d(__MODULE__, :d, 1)
+  end
+
+  def d(function, arity) when is_atom(function) and is_integer(arity) do
+    if function_exported?(__MODULE__, function, arity) do
+      d(__MODULE__, function, arity)
+    else
+      d(Kernel, function, arity)
+    end
+  end
+
+  def d(module, :all) when is_atom(module) do
+    case Code.ensure_loaded(module) do
+      { :module, _ } ->
+        case module.__info__(:moduledoc) do
+          { _, binary } when is_binary(binary) ->
+            IO.puts "# #{inspect module}\n"
+            IO.write binary
+          { _, _ } ->
+            IO.puts "No docs for #{inspect module}"
+          _ ->
+            IO.puts "#{inspect module} was not compiled with docs"
+        end
+      { :error, reason } ->
+        IO.puts "Could not load module #{inspect module}: #{reason}"
+    end
+  end
+
+  @doc """
+  Shows the documentation for the `function/arity` in `module`.
+  """
+  def d(module, function, arity) when is_atom(module) and is_atom(function) and is_integer(arity) do
+    if docs = module.__info__(:docs) do
+      doc =
+        if tuple = List.keyfind(docs, { function, arity }, 1) do
+          print_signature(tuple)
+        end
+
+      if doc do
+        IO.write "\n" <> doc
+      else
+        IO.puts "No docs for #{function}/#{arity}"
+      end
+    else
+      IO.puts "#{inspect module} was not compiled with docs"
+    end
+  end
+
+  # Get the full signature from a function.
+  defp print_signature({ _info, _line, _kind, _args, false }) do
+    false
+  end
+
+  defp print_signature({ { name, _arity }, _line, kind, args, docs }) do
+    args = Enum.map_join(args, ", ", signature_arg(&1))
+    IO.puts "* #{kind} #{name}(#{args})"
+    docs
+  end
+
+  defp signature_arg({ ://, _, [left, right] }) do
+    signature_arg(left) <> " // " <> Macro.to_binary(right)
+  end
+
+  defp signature_arg({ var, _, _ }) do
+    atom_to_binary(var)
+  end
+
+  @doc """
+  Retrieves nth query's value from the history. Use negative
+  values to lookup query's value from latest to earliest.
+  For instance, v(-1) returns the latest result.
+  """
+  def v(n) when n < 0 do
+    history = Process.get(:iex_history)
+    Enum.nth!(history, abs(n)).result
+  end
+
+  def v(n) do
+    history = Process.get(:iex_history) /> List.reverse
+    Enum.nth!(history, n).result
+  end
+
+  @doc """
+  Reloads all modules that were already reloaded
+  at some point with `r/1`.
+  """
+  def r do
+    Enum.map iex_reloaded, r(&1)
+  end
+
+  @doc """
+  Recompiles and reloads the specified module's source file.
+
+  Please note that all the modules defined in the specified
+  files are recompiled and reloaded.
+  """
+  def r(module) do
+    if source = source(module) do
+      Process.put(:iex_reloaded, :ordsets.add_element(module, iex_reloaded))
+      { module, Code.load_file source }
+    else
+      :nosource
+    end
+  end
+
+  defp iex_reloaded do
+    Process.get(:iex_reloaded) || :ordsets.new
+  end
+
+  defp source(module) do
+    compile = module.module_info(:compile)
+
+    # Get the source of the compiled module. Due to a bug in Erlang
+    # R15 and before, we need to look for the source first in the
+    # options and then into the real source.
+    options =
+      case List.keyfind(compile, :options, 1) do
+        { :options, opts } -> opts
+        _ -> []
+      end
+
+    source = List.keyfind(options, :source, 1)  || List.keyfind(compile, :source, 1)
+
+    case source do
+      { :source, source } -> list_to_binary(source)
+      _ -> nil
+    end
+  end
+end
@@ -0,0 +1,24 @@
+defmodule IEx.Remsh do
+  @moduledoc """
+  Helper function injected into connecting remote nodes
+  to properly handle autocompletion. Elixir supports:
+
+  * remsh from an elixir node to an elixir node
+  * remsh from a plain erlang node to an elixir node (through the ^G menu)
+  * remsh from an elixir node to a plain erlang node (and get an erl shell there)
+
+  In order to get an Elixir shell from the ^G menu,
+  you need to use 'Elixir-IEx' as the shell name.
+
+  Connecting an Elixir shell to a remote node without
+  Elixir is **not** supported.
+  """
+  def expand(node) do
+    fn e ->
+      case :rpc.call node, Elixir.IEx.Autocomplete, :expand, [e] do
+        {:badrpc, _} -> {:no, '', []}
+        r -> r 
+      end
+    end
+  end
+end
@@ -0,0 +1,45 @@
+defmodule IEx.UnicodeIO do
+  @moduledoc """
+  This module implements the API used by IEX to
+  interact with the console. This API may change
+  in the future without warnings.
+  """
+
+  @doc """
+  Implements the get IO API used by IEx. It receives the
+  code cache, the instructions counter and needs to
+  return a list with the new characters inserted.
+  """
+  def get(config) do
+    prefix = case config.cache do
+      [] -> "iex"
+      _  -> "..."
+    end
+    prompt = case node do
+      :nonode@nohost ->
+        "#{prefix}(#{config.counter})> "
+      n ->
+        "#{prefix}(#{n})#{config.counter}> "
+    end
+    case IO.gets(prompt) do
+      { :error, _ } -> ''
+      data -> :unicode.characters_to_list(data)
+    end
+  end
+
+  @doc """
+  Implements the put IO API used by IEx. It receives the
+  result and prints it.
+  """
+  def put(result) do
+    IO.inspect result
+  end
+
+  @doc """
+  Implements the error IO API used by IEx. It prints error
+  messages.
+  """
+  def error(result) do
+    IO.puts result
+  end
+end
@@ -1,490 +0,0 @@
-import Kernel, except: [inspect: 1]
-import Inspect.Algebra
-
-alias Code.Identifier
-
-defprotocol Inspect do
-  @moduledoc """
-  The `Inspect` protocol converts an Elixir data structure into an
-  algebra document.
-
-  This documentation refers to implementing the `Inspect` protocol
-  for your own data structures. To learn more about using inspect,
-  see `Kernel.inspect/2` and `IO.inspect/2`.
-
-  The `inspect/2` function receives the entity to be inspected
-  followed by the inspecting options, represented by the struct
-  `Inspect.Opts`. Building of the algebra document is done with
-  `Inspect.Algebra`.
-
-  ## Examples
-
-  Many times, inspecting a structure can be implemented in function
-  of existing entities. For example, here is `MapSet`'s `inspect/2`
-  implementation:
-
-      defimpl Inspect, for: MapSet do
-        import Inspect.Algebra
-
-        def inspect(map_set, opts) do
-          concat(["#MapSet<", to_doc(MapSet.to_list(map_set), opts), ">"])
-        end
-      end
-
-  The [`concat/1`](`Inspect.Algebra.concat/1`) function comes from
-  `Inspect.Algebra` and it concatenates algebra documents together.
-  In the example above it is concatenating the string `"#MapSet<"`,
-  the document returned by `Inspect.Algebra.to_doc/2`, and the final
-  string `">"`. We prefix the module name `#` to denote the inspect
-  presentation is not actually valid Elixir syntax.
-
-  Finally, note strings themselves are valid algebra documents that
-  keep their formatting when pretty printed. This means your `Inspect`
-  implementation may simply return a string, although that will devoid
-  it of any pretty-printing.
-
-  ## Error handling
-
-  In case there is an error while your structure is being inspected,
-  Elixir will raise an `ArgumentError` error and will automatically fall back
-  to a raw representation for printing the structure.
-
-  You can however access the underlying error by invoking the `Inspect`
-  implementation directly. For example, to test `Inspect.MapSet` above,
-  you can invoke it as:
-
-      Inspect.MapSet.inspect(MapSet.new(), %Inspect.Opts{})
-
-  ## Deriving
-
-  The `Inspect` protocol can be derived to hide certain fields from
-  structs, so they don't show up in logs, inspects and similar. This
-  is especially useful for fields containing private information.
-
-  The options `:only` and `:except` can be used with `@derive` to
-  specify which fields should and should not appear in the
-  algebra document:
-
-      defmodule User do
-        @derive {Inspect, only: [:id, :name]}
-        defstruct [:id, :name, :address]
-      end
-
-      inspect(%User{id: 1, name: "Homer", address: "742 Evergreen Terrace"})
-      #=> #User<id: 1, name: "Homer", ...>
-
-  """
-
-  # Handle structs in Any
-  @fallback_to_any true
-
-  @doc """
-  Converts `term` into an algebra document.
-
-  This function shouldn't be invoked directly, unless when implementing
-  a custom `inspect_fun` to be given to `Inspect.Opts`. Everywhere else,
-  `Inspect.Algebra.to_doc/2` should be preferred as it handles structs
-  and exceptions.
-  """
-  @spec inspect(t, Inspect.Opts.t()) :: Inspect.Algebra.t()
-  def inspect(term, opts)
-end
-
-defimpl Inspect, for: Atom do
-  require Macro
-
-  def inspect(atom, opts) do
-    color(Identifier.inspect_as_atom(atom), color_key(atom), opts)
-  end
-
-  defp color_key(atom) when is_boolean(atom), do: :boolean
-  defp color_key(nil), do: nil
-  defp color_key(_), do: :atom
-end
-
-defimpl Inspect, for: BitString do
-  def inspect(term, opts) when is_binary(term) do
-    %Inspect.Opts{binaries: bins, base: base, printable_limit: printable_limit} = opts
-
-    if base == :decimal and
-         (bins == :as_strings or (bins == :infer and String.printable?(term, printable_limit))) do
-      inspected =
-        case Identifier.escape(term, ?", printable_limit) do
-          {escaped, ""} -> [?", escaped, ?"]
-          {escaped, _} -> [?", escaped, ?", " <> ..."]
-        end
-
-      color(IO.iodata_to_binary(inspected), :string, opts)
-    else
-      inspect_bitstring(term, opts)
-    end
-  end
-
-  def inspect(term, opts) do
-    inspect_bitstring(term, opts)
-  end
-
-  defp inspect_bitstring("", opts) do
-    color("<<>>", :binary, opts)
-  end
-
-  defp inspect_bitstring(bitstring, opts) do
-    left = color("<<", :binary, opts)
-    right = color(">>", :binary, opts)
-    inner = each_bit(bitstring, opts.limit, opts)
-    group(concat(concat(left, nest(inner, 2)), right))
-  end
-
-  defp each_bit(_, 0, _) do
-    "..."
-  end
-
-  defp each_bit(<<>>, _counter, _opts) do
-    :doc_nil
-  end
-
-  defp each_bit(<<h::8>>, _counter, opts) do
-    Inspect.Integer.inspect(h, opts)
-  end
-
-  defp each_bit(<<h, t::bitstring>>, counter, opts) do
-    flex_glue(
-      concat(Inspect.Integer.inspect(h, opts), ","),
-      each_bit(t, decrement(counter), opts)
-    )
-  end
-
-  defp each_bit(bitstring, _counter, opts) do
-    size = bit_size(bitstring)
-    <<h::size(size)>> = bitstring
-    concat(Inspect.Integer.inspect(h, opts), "::size(" <> Integer.to_string(size) <> ")")
-  end
-
-  @compile {:inline, decrement: 1}
-  defp decrement(:infinity), do: :infinity
-  defp decrement(counter), do: counter - 1
-end
-
-defimpl Inspect, for: List do
-  def inspect([], opts) do
-    color("[]", :list, opts)
-  end
-
-  # TODO: Remove :char_list and :as_char_lists handling on v2.0
-  def inspect(term, opts) do
-    %Inspect.Opts{
-      charlists: lists,
-      char_lists: lists_deprecated,
-      printable_limit: printable_limit
-    } = opts
-
-    lists =
-      if lists == :infer and lists_deprecated != :infer do
-        case lists_deprecated do
-          :as_char_lists ->
-            IO.warn(
-              "the :char_lists inspect option and its :as_char_lists " <>
-                "value are deprecated, use the :charlists option and its " <>
-                ":as_charlists value instead"
-            )
-
-            :as_charlists
-
-          _ ->
-            IO.warn("the :char_lists inspect option is deprecated, use :charlists instead")
-            lists_deprecated
-        end
-      else
-        lists
-      end
-
-    open = color("[", :list, opts)
-    sep = color(",", :list, opts)
-    close = color("]", :list, opts)
-
-    cond do
-      lists == :as_charlists or (lists == :infer and List.ascii_printable?(term, printable_limit)) ->
-        inspected =
-          case Identifier.escape(IO.chardata_to_string(term), ?', printable_limit) do
-            {escaped, ""} -> [?', escaped, ?']
-            {escaped, _} -> [?', escaped, ?', " ++ ..."]
-          end
-
-        IO.iodata_to_binary(inspected)
-
-      keyword?(term) ->
-        container_doc(open, term, close, opts, &keyword/2, separator: sep, break: :strict)
-
-      true ->
-        container_doc(open, term, close, opts, &to_doc/2, separator: sep)
-    end
-  end
-
-  @doc false
-  def keyword({key, value}, opts) do
-    key = color(Identifier.inspect_as_key(key), :atom, opts)
-    concat(key, concat(" ", to_doc(value, opts)))
-  end
-
-  @doc false
-  def keyword?([{key, _value} | rest]) when is_atom(key) do
-    case Atom.to_charlist(key) do
-      'Elixir.' ++ _ -> false
-      _ -> keyword?(rest)
-    end
-  end
-
-  def keyword?([]), do: true
-  def keyword?(_other), do: false
-end
-
-defimpl Inspect, for: Tuple do
-  def inspect(tuple, opts) do
-    open = color("{", :tuple, opts)
-    sep = color(",", :tuple, opts)
-    close = color("}", :tuple, opts)
-    container_opts = [separator: sep, break: :flex]
-    container_doc(open, Tuple.to_list(tuple), close, opts, &to_doc/2, container_opts)
-  end
-end
-
-defimpl Inspect, for: Map do
-  def inspect(map, opts) do
-    inspect(map, "", opts)
-  end
-
-  def inspect(map, name, opts) do
-    map = Map.to_list(map)
-    open = color("%" <> name <> "{", :map, opts)
-    sep = color(",", :map, opts)
-    close = color("}", :map, opts)
-    container_doc(open, map, close, opts, traverse_fun(map, opts), separator: sep, break: :strict)
-  end
-
-  defp traverse_fun(list, opts) do
-    if Inspect.List.keyword?(list) do
-      &Inspect.List.keyword/2
-    else
-      sep = color(" => ", :map, opts)
-      &to_map(&1, &2, sep)
-    end
-  end
-
-  defp to_map({key, value}, opts, sep) do
-    concat(concat(to_doc(key, opts), sep), to_doc(value, opts))
-  end
-end
-
-defimpl Inspect, for: Integer do
-  def inspect(term, %Inspect.Opts{base: base} = opts) do
-    inspected = Integer.to_string(term, base_to_value(base)) |> prepend_prefix(base)
-    color(inspected, :number, opts)
-  end
-
-  defp base_to_value(base) do
-    case base do
-      :binary -> 2
-      :decimal -> 10
-      :octal -> 8
-      :hex -> 16
-    end
-  end
-
-  defp prepend_prefix(value, :decimal), do: value
-
-  defp prepend_prefix(<<?-, value::binary>>, base) do
-    "-" <> prepend_prefix(value, base)
-  end
-
-  defp prepend_prefix(value, base) do
-    prefix =
-      case base do
-        :binary -> "0b"
-        :octal -> "0o"
-        :hex -> "0x"
-      end
-
-    prefix <> value
-  end
-end
-
-defimpl Inspect, for: Float do
-  def inspect(term, opts) do
-    inspected = IO.iodata_to_binary(:io_lib_format.fwrite_g(term))
-    color(inspected, :number, opts)
-  end
-end
-
-defimpl Inspect, for: Regex do
-  def inspect(regex, opts) do
-    {escaped, _} =
-      regex.source
-      |> normalize(<<>>)
-      |> Identifier.escape(?/, :infinity, &escape_map/1)
-
-    source = IO.iodata_to_binary(['~r/', escaped, ?/, regex.opts])
-    color(source, :regex, opts)
-  end
-
-  defp normalize(<<?\\, ?\\, rest::binary>>, acc), do: normalize(rest, <<acc::binary, ?\\, ?\\>>)
-  defp normalize(<<?\\, ?/, rest::binary>>, acc), do: normalize(rest, <<acc::binary, ?/>>)
-  defp normalize(<<char, rest::binary>>, acc), do: normalize(rest, <<acc::binary, char>>)
-  defp normalize(<<>>, acc), do: acc
-
-  defp escape_map(?\a), do: '\\a'
-  defp escape_map(?\f), do: '\\f'
-  defp escape_map(?\n), do: '\\n'
-  defp escape_map(?\r), do: '\\r'
-  defp escape_map(?\t), do: '\\t'
-  defp escape_map(?\v), do: '\\v'
-  defp escape_map(_), do: false
-end
-
-defimpl Inspect, for: Function do
-  def inspect(function, _opts) do
-    fun_info = Function.info(function)
-    mod = fun_info[:module]
-    name = fun_info[:name]
-
-    cond do
-      fun_info[:type] == :external and fun_info[:env] == [] ->
-        inspected_as_atom = Identifier.inspect_as_atom(mod)
-        inspected_as_function = Identifier.inspect_as_function(name)
-        "&#{inspected_as_atom}.#{inspected_as_function}/#{fun_info[:arity]}"
-
-      match?('elixir_compiler_' ++ _, Atom.to_charlist(mod)) ->
-        if function_exported?(mod, :__RELATIVE__, 0) do
-          "#Function<#{uniq(fun_info)} in file:#{mod.__RELATIVE__}>"
-        else
-          default_inspect(mod, fun_info)
-        end
-
-      true ->
-        default_inspect(mod, fun_info)
-    end
-  end
-
-  defp default_inspect(mod, fun_info) do
-    inspected_as_atom = Identifier.inspect_as_atom(mod)
-    extracted_name = extract_name(fun_info[:name])
-    "#Function<#{uniq(fun_info)}/#{fun_info[:arity]} in #{inspected_as_atom}#{extracted_name}>"
-  end
-
-  defp extract_name([]) do
-    ""
-  end
-
-  defp extract_name(name) do
-    case Identifier.extract_anonymous_fun_parent(name) do
-      {name, arity} ->
-        "." <> Identifier.inspect_as_function(name) <> "/" <> arity
-
-      :error ->
-        "." <> Identifier.inspect_as_function(name)
-    end
-  end
-
-  defp uniq(fun_info) do
-    Integer.to_string(fun_info[:new_index]) <> "." <> Integer.to_string(fun_info[:uniq])
-  end
-end
-
-defimpl Inspect, for: PID do
-  def inspect(pid, _opts) do
-    "#PID" <> IO.iodata_to_binary(:erlang.pid_to_list(pid))
-  end
-end
-
-defimpl Inspect, for: Port do
-  def inspect(port, _opts) do
-    IO.iodata_to_binary(:erlang.port_to_list(port))
-  end
-end
-
-defimpl Inspect, for: Reference do
-  def inspect(ref, _opts) do
-    '#Ref' ++ rest = :erlang.ref_to_list(ref)
-    "#Reference" <> IO.iodata_to_binary(rest)
-  end
-end
-
-defimpl Inspect, for: Any do
-  defmacro __deriving__(module, struct, options) do
-    fields = Map.keys(struct) -- [:__exception__, :__struct__]
-    only = Keyword.get(options, :only, fields)
-    except = Keyword.get(options, :except, [])
-
-    filtered_fields =
-      fields
-      |> Enum.reject(&(&1 in except))
-      |> Enum.filter(&(&1 in only))
-
-    inspect_module =
-      if fields == only and except == [] do
-        Inspect.Map
-      else
-        Inspect.Any
-      end
-
-    quote do
-      defimpl Inspect, for: unquote(module) do
-        def inspect(var!(struct), var!(opts)) do
-          var!(map) = Map.take(var!(struct), unquote(filtered_fields))
-          var!(name) = Identifier.inspect_as_atom(unquote(module))
-          unquote(inspect_module).inspect(var!(map), var!(name), var!(opts))
-        end
-      end
-    end
-  end
-
-  def inspect(%module{} = struct, opts) do
-    try do
-      module.__struct__()
-    rescue
-      _ -> Inspect.Map.inspect(struct, opts)
-    else
-      dunder ->
-        if Map.keys(dunder) == Map.keys(struct) do
-          pruned = Map.drop(struct, [:__struct__, :__exception__])
-          Inspect.Map.inspect(pruned, Identifier.inspect_as_atom(module), opts)
-        else
-          Inspect.Map.inspect(struct, opts)
-        end
-    end
-  end
-
-  def inspect(map, name, opts) do
-    map = Map.to_list(map) ++ [:...]
-    open = color("#" <> name <> "<", :map, opts)
-    sep = color(",", :map, opts)
-    close = color(">", :map, opts)
-
-    fun = fn
-      {key, value}, opts -> Inspect.List.keyword({key, value}, opts)
-      :..., _opts -> "..."
-    end
-
-    container_doc(open, map, close, opts, fun, separator: sep, break: :strict)
-  end
-end
-
-require Protocol
-
-Protocol.derive(
-  Inspect,
-  Macro.Env,
-  only: [
-    :module,
-    :file,
-    :line,
-    :function,
-    :context,
-    :aliases,
-    :requires,
-    :functions,
-    :macros,
-    :macro_aliases,
-    :context_modules,
-    :lexical_tracker
-  ]
-)
@@ -1,489 +0,0 @@
-defmodule Integer do
-  @moduledoc """
-  Functions for working with integers.
-
-  Some functions that work on integers are found in `Kernel`:
-
-    * `abs/1`
-    * `div/2`
-    * `max/2`
-    * `min/2`
-    * `rem/2`
-
-  """
-
-  import Bitwise
-
-  @doc """
-  Determines if `integer` is odd.
-
-  Returns `true` if the given `integer` is an odd number,
-  otherwise it returns `false`.
-
-  Allowed in guard clauses.
-
-  ## Examples
-
-      iex> Integer.is_odd(5)
-      true
-
-      iex> Integer.is_odd(6)
-      false
-
-      iex> Integer.is_odd(-5)
-      true
-
-      iex> Integer.is_odd(0)
-      false
-
-  """
-  defguard is_odd(integer) when is_integer(integer) and (integer &&& 1) == 1
-
-  @doc """
-  Determines if an `integer` is even.
-
-  Returns `true` if the given `integer` is an even number,
-  otherwise it returns `false`.
-
-  Allowed in guard clauses.
-
-  ## Examples
-
-      iex> Integer.is_even(10)
-      true
-
-      iex> Integer.is_even(5)
-      false
-
-      iex> Integer.is_even(-10)
-      true
-
-      iex> Integer.is_even(0)
-      true
-
-  """
-  defguard is_even(integer) when is_integer(integer) and (integer &&& 1) == 0
-
-  @doc """
-  Computes `base` raised to power of `exponent`.
-
-  Both `base` and `exponent` must be integers.
-  The exponent must be zero or positive.
-
-  See `Float.pow/2` for exponentiation of negative
-  exponents as well as floats.
-
-  ## Examples
-
-      iex> Integer.pow(2, 0)
-      1
-      iex> Integer.pow(2, 1)
-      2
-      iex> Integer.pow(2, 10)
-      1024
-      iex> Integer.pow(2, 11)
-      2048
-      iex> Integer.pow(2, 64)
-      0x10000000000000000
-
-      iex> Integer.pow(3, 4)
-      81
-      iex> Integer.pow(4, 3)
-      64
-
-      iex> Integer.pow(-2, 3)
-      -8
-      iex> Integer.pow(-2, 4)
-      16
-
-      iex> Integer.pow(2, -2)
-      ** (ArithmeticError) bad argument in arithmetic expression
-
-  """
-  @doc since: "1.12.0"
-  @spec pow(integer, non_neg_integer) :: integer
-  def pow(base, exponent) when is_integer(base) and is_integer(exponent) do
-    if exponent < 0, do: :erlang.error(:badarith, [base, exponent])
-    base ** exponent
-  end
-
-  @doc """
-  Computes the modulo remainder of an integer division.
-
-  This function performs a [floored division](`floor_div/2`), which means that
-  the result will always have the sign of the `divisor`.
-
-  Raises an `ArithmeticError` exception if one of the arguments is not an
-  integer, or when the `divisor` is `0`.
-
-  ## Examples
-
-      iex> Integer.mod(5, 2)
-      1
-      iex> Integer.mod(6, -4)
-      -2
-
-  """
-  @doc since: "1.4.0"
-  @spec mod(integer, neg_integer | pos_integer) :: integer
-  def mod(dividend, divisor) do
-    remainder = rem(dividend, divisor)
-
-    if remainder * divisor < 0 do
-      remainder + divisor
-    else
-      remainder
-    end
-  end
-
-  @doc """
-  Performs a floored integer division.
-
-  Raises an `ArithmeticError` exception if one of the arguments is not an
-  integer, or when the `divisor` is `0`.
-
-  This function performs a *floored* integer division, which means that
-  the result will always be rounded towards negative infinity.
-
-  If you want to perform truncated integer division (rounding towards zero),
-  use `Kernel.div/2` instead.
-
-  ## Examples
-
-      iex> Integer.floor_div(5, 2)
-      2
-      iex> Integer.floor_div(6, -4)
-      -2
-      iex> Integer.floor_div(-99, 2)
-      -50
-
-  """
-  @doc since: "1.4.0"
-  @spec floor_div(integer, neg_integer | pos_integer) :: integer
-  def floor_div(dividend, divisor) do
-    if dividend * divisor < 0 and rem(dividend, divisor) != 0 do
-      div(dividend, divisor) - 1
-    else
-      div(dividend, divisor)
-    end
-  end
-
-  @doc """
-  Returns the ordered digits for the given `integer`.
-
-  An optional `base` value may be provided representing the radix for the returned
-  digits. This one must be an integer >= 2.
-
-  ## Examples
-
-      iex> Integer.digits(123)
-      [1, 2, 3]
-
-      iex> Integer.digits(170, 2)
-      [1, 0, 1, 0, 1, 0, 1, 0]
-
-      iex> Integer.digits(-170, 2)
-      [-1, 0, -1, 0, -1, 0, -1, 0]
-
-  """
-  @spec digits(integer, pos_integer) :: [integer, ...]
-  def digits(integer, base \\ 10)
-      when is_integer(integer) and is_integer(base) and base >= 2 do
-    do_digits(integer, base, [])
-  end
-
-  defp do_digits(integer, base, acc) when abs(integer) < base, do: [integer | acc]
-
-  defp do_digits(integer, base, acc),
-    do: do_digits(div(integer, base), base, [rem(integer, base) | acc])
-
-  @doc """
-  Returns the integer represented by the ordered `digits`.
-
-  An optional `base` value may be provided representing the radix for the `digits`.
-  Base has to be an integer greater than or equal to `2`.
-
-  ## Examples
-
-      iex> Integer.undigits([1, 2, 3])
-      123
-
-      iex> Integer.undigits([1, 4], 16)
-      20
-
-      iex> Integer.undigits([])
-      0
-
-  """
-  @spec undigits([integer], pos_integer) :: integer
-  def undigits(digits, base \\ 10) when is_list(digits) and is_integer(base) and base >= 2 do
-    do_undigits(digits, base, 0)
-  end
-
-  defp do_undigits([], _base, acc), do: acc
-
-  defp do_undigits([digit | _], base, _) when is_integer(digit) and digit >= base,
-    do: raise(ArgumentError, "invalid digit #{digit} in base #{base}")
-
-  defp do_undigits([digit | tail], base, acc) when is_integer(digit),
-    do: do_undigits(tail, base, acc * base + digit)
-
-  @doc """
-  Parses a text representation of an integer.
-
-  An optional `base` to the corresponding integer can be provided.
-  If `base` is not given, 10 will be used.
-
-  If successful, returns a tuple in the form of `{integer, remainder_of_binary}`.
-  Otherwise `:error`.
-
-  Raises an error if `base` is less than 2 or more than 36.
-
-  If you want to convert a string-formatted integer directly to an integer,
-  `String.to_integer/1` or `String.to_integer/2` can be used instead.
-
-  ## Examples
-
-      iex> Integer.parse("34")
-      {34, ""}
-
-      iex> Integer.parse("34.5")
-      {34, ".5"}
-
-      iex> Integer.parse("three")
-      :error
-
-      iex> Integer.parse("34", 10)
-      {34, ""}
-
-      iex> Integer.parse("f4", 16)
-      {244, ""}
-
-      iex> Integer.parse("Awww++", 36)
-      {509216, "++"}
-
-      iex> Integer.parse("fab", 10)
-      :error
-
-      iex> Integer.parse("a2", 38)
-      ** (ArgumentError) invalid base 38
-
-  """
-  @spec parse(binary, 2..36) :: {integer, remainder_of_binary :: binary} | :error
-  def parse(binary, base \\ 10)
-
-  def parse(_binary, base) when base not in 2..36 do
-    raise ArgumentError, "invalid base #{inspect(base)}"
-  end
-
-  def parse(binary, base) when is_binary(binary) do
-    case count_digits(binary, base) do
-      0 ->
-        :error
-
-      count ->
-        {digits, rem} = :erlang.split_binary(binary, count)
-        {:erlang.binary_to_integer(digits, base), rem}
-    end
-  end
-
-  defp count_digits(<<sign, rest::bits>>, base) when sign in '+-' do
-    case count_digits_nosign(rest, base, 1) do
-      1 -> 0
-      count -> count
-    end
-  end
-
-  defp count_digits(<<rest::bits>>, base) do
-    count_digits_nosign(rest, base, 0)
-  end
-
-  digits = [{?0..?9, -?0}, {?A..?Z, 10 - ?A}, {?a..?z, 10 - ?a}]
-
-  for {chars, diff} <- digits,
-      char <- chars do
-    digit = char + diff
-
-    defp count_digits_nosign(<<unquote(char), rest::bits>>, base, count)
-         when base > unquote(digit) do
-      count_digits_nosign(rest, base, count + 1)
-    end
-  end
-
-  defp count_digits_nosign(<<_::bits>>, _, count), do: count
-
-  @doc """
-  Returns a binary which corresponds to the text representation
-  of `integer` in the given `base`.
-
-  `base` can be an integer between 2 and 36. If no `base` is given,
-  it defaults to `10`.
-
-  Inlined by the compiler.
-
-  ## Examples
-
-      iex> Integer.to_string(123)
-      "123"
-
-      iex> Integer.to_string(+456)
-      "456"
-
-      iex> Integer.to_string(-789)
-      "-789"
-
-      iex> Integer.to_string(0123)
-      "123"
-
-      iex> Integer.to_string(100, 16)
-      "64"
-
-      iex> Integer.to_string(-100, 16)
-      "-64"
-
-      iex> Integer.to_string(882_681_651, 36)
-      "ELIXIR"
-
-  """
-  @spec to_string(integer, 2..36) :: String.t()
-  def to_string(integer, base \\ 10) do
-    :erlang.integer_to_binary(integer, base)
-  end
-
-  @doc """
-  Returns a charlist which corresponds to the text representation
-  of `integer` in the given `base`.
-
-  `base` can be an integer between 2 and 36. If no `base` is given,
-  it defaults to `10`.
-
-  Inlined by the compiler.
-
-  ## Examples
-
-      iex> Integer.to_charlist(123)
-      '123'
-
-      iex> Integer.to_charlist(+456)
-      '456'
-
-      iex> Integer.to_charlist(-789)
-      '-789'
-
-      iex> Integer.to_charlist(0123)
-      '123'
-
-      iex> Integer.to_charlist(100, 16)
-      '64'
-
-      iex> Integer.to_charlist(-100, 16)
-      '-64'
-
-      iex> Integer.to_charlist(882_681_651, 36)
-      'ELIXIR'
-
-  """
-  @spec to_charlist(integer, 2..36) :: charlist
-  def to_charlist(integer, base \\ 10) do
-    :erlang.integer_to_list(integer, base)
-  end
-
-  @doc """
-  Returns the greatest common divisor of the two given integers.
-
-  The greatest common divisor (GCD) of `integer1` and `integer2` is the largest positive
-  integer that divides both `integer1` and `integer2` without leaving a remainder.
-
-  By convention, `gcd(0, 0)` returns `0`.
-
-  ## Examples
-
-      iex> Integer.gcd(2, 3)
-      1
-
-      iex> Integer.gcd(8, 12)
-      4
-
-      iex> Integer.gcd(8, -12)
-      4
-
-      iex> Integer.gcd(10, 0)
-      10
-
-      iex> Integer.gcd(7, 7)
-      7
-
-      iex> Integer.gcd(0, 0)
-      0
-
-  """
-  @doc since: "1.5.0"
-  @spec gcd(integer, integer) :: non_neg_integer
-  def gcd(integer1, integer2) when is_integer(integer1) and is_integer(integer2) do
-    gcd_positive(abs(integer1), abs(integer2))
-  end
-
-  defp gcd_positive(0, integer2), do: integer2
-  defp gcd_positive(integer1, 0), do: integer1
-  defp gcd_positive(integer1, integer2), do: gcd_positive(integer2, rem(integer1, integer2))
-
-  @doc """
-  Returns the extended greatest common divisor of the two given integers.
-
-  This function uses the extended Euclidean algorithm to return a three-element tuple with the `gcd`
-  and the coefficients `m` and `n` of Bézout's identity such that:
-
-      gcd(a, b) = m*a + n*b
-
-  By convention, `extended_gcd(0, 0)` returns `{0, 0, 0}`.
-
-  ## Examples
-
-      iex> Integer.extended_gcd(240, 46)
-      {2, -9, 47}
-      iex> Integer.extended_gcd(46, 240)
-      {2, 47, -9}
-      iex> Integer.extended_gcd(-46, 240)
-      {2, -47, -9}
-      iex> Integer.extended_gcd(-46, -240)
-      {2, -47, 9}
-
-      iex> Integer.extended_gcd(14, 21)
-      {7, -1, 1}
-
-      iex> Integer.extended_gcd(10, 0)
-      {10, 1, 0}
-      iex> Integer.extended_gcd(0, 10)
-      {10, 0, 1}
-      iex> Integer.extended_gcd(0, 0)
-      {0, 0, 0}
-
-  """
-  @doc since: "1.12.0"
-  @spec extended_gcd(integer, integer) :: {non_neg_integer, integer, integer}
-  def extended_gcd(0, 0), do: {0, 0, 0}
-  def extended_gcd(0, b), do: {b, 0, 1}
-  def extended_gcd(a, 0), do: {a, 1, 0}
-
-  def extended_gcd(integer1, integer2) when is_integer(integer1) and is_integer(integer2) do
-    extended_gcd(integer2, integer1, 0, 1, 1, 0)
-  end
-
-  defp extended_gcd(r1, r0, s1, s0, t1, t0) do
-    div = div(r0, r1)
-
-    case r0 - div * r1 do
-      0 when r1 > 0 -> {r1, s1, t1}
-      0 when r1 < 0 -> {-r1, -s1, -t1}
-      r2 -> extended_gcd(r2, r1, s0 - div * s1, s1, t0 - div * t1, t1)
-    end
-  end
-
-  @doc false
-  @deprecated "Use Integer.to_charlist/1 instead"
-  def to_char_list(integer), do: Integer.to_charlist(integer)
-
-  @doc false
-  @deprecated "Use Integer.to_charlist/2 instead"
-  def to_char_list(integer, base), do: Integer.to_charlist(integer, base)
-end
@@ -1,725 +1,135 @@
 defmodule IO do
-  @moduledoc ~S"""
-  Functions handling input/output (IO).
+  @moduledoc """
+  Module responsible for doing IO. The function in this
+  module expects an iodata as argument encoded in UTF-8.
+  An iodata can be:

-  Many functions in this module expect an IO device as an argument.
-  An IO device must be a PID or an atom representing a process.
-  For convenience, Elixir provides `:stdio` and `:stderr` as
-  shortcuts to Erlang's `:standard_io` and `:standard_error`.
-
-  The majority of the functions expect chardata. In case another type is given,
-  functions will convert those types to string via the `String.Chars` protocol
-  (as shown in typespecs). For more information on chardata, see the
-  "IO data" section below.
-
-  ## IO devices
-
-  An IO device may be an atom or a PID. In case it is an atom,
-  the atom must be the name of a registered process. In addition,
-  Elixir provides two shortcuts:
-
-    * `:stdio` - a shortcut for `:standard_io`, which maps to
-      the current `Process.group_leader/0` in Erlang
-
-    * `:stderr` - a shortcut for the named process `:standard_error`
-      provided in Erlang
-
-  IO devices maintain their position, which means subsequent calls to any
-  reading or writing functions will start from the place where the device
-  was last accessed. The position of files can be changed using the
-  `:file.position/2` function.
-
-  ## IO data
-
-  IO data is a data type that can be used as a more efficient alternative to binaries
-  in certain situations.
-
-  A term of type **IO data** is a binary or a list containing bytes (integers within the `0..255` range)
-  or nested IO data. The type is recursive. Let's see an example of one of
-  the possible IO data representing the binary `"hello"`:
-
-      [?h, "el", ["l", [?o]]]
-
-  The built-in `t:iodata/0` type is defined in terms of `t:iolist/0`. An IO list is
-  the same as IO data but it doesn't allow for a binary at the top level (but binaries
-  are still allowed in the list itself).
-
-  ### Use cases for IO data
-
-  IO data exists because often you need to do many append operations
-  on smaller chunks of binaries in order to create a bigger binary. However, in
-  Erlang and Elixir concatenating binaries will copy the concatenated binaries
-  into a new binary.
-
-      def email(username, domain) do
-        username <> "@" <> domain
-      end
-
-  In this function, creating the email address will copy the `username` and `domain`
-  binaries. Now imagine you want to use the resulting email inside another binary:
-
-      def welcome_message(name, username, domain) do
-        "Welcome #{name}, your email is: #{email(username, domain)}"
-      end
-
-      IO.puts(welcome_message("Meg", "meg", "example.com"))
-      #=> "Welcome Meg, your email is: meg@example.com"
-
-  Every time you concatenate binaries or use interpolation (`#{}`) you are making
-  copies of those binaries. However, in many cases you don't need the complete
-  binary while you create it, but only at the end to print it out or send it
-  somewhere. In such cases, you can construct the binary by creating IO data:
-
-      def email(username, domain) do
-        [username, ?@, domain]
-      end
-
-      def welcome_message(name, username, domain) do
-        ["Welcome ", name, ", your email is: ", email(username, domain)]
-      end
-
-      IO.puts(welcome_message("Meg", "meg", "example.com"))
-      #=> "Welcome Meg, your email is: meg@example.com"
-
-  Building IO data is cheaper than concatenating binaries. Concatenating multiple
-  pieces of IO data just means putting them together inside a list since IO data
-  can be arbitrarily nested, and that's a cheap and efficient operation. Most of
-  the IO-based APIs, such as `:gen_tcp` and `IO`, receive IO data and write it
-  to the socket directly without converting it to binary.
-
-  One drawback of IO data is that you can't do things like pattern match on the
-  first part of a piece of IO data like you can with a binary, because you usually
-  don't know the shape of the IO data. In those cases, you may need to convert it
-  to a binary by calling `iodata_to_binary/1`, which is reasonably efficient
-  since it's implemented natively in C. Other functionality, like computing the
-  length of IO data, can be computed directly on the iodata by calling `iodata_length/1`.
-
-  ### Chardata
-
-  Erlang and Elixir also have the idea of `t:chardata/0`. Chardata is very
-  similar to IO data: the only difference is that integers in IO data represent
-  bytes while integers in chardata represent Unicode code points. Bytes
-  (`t:byte/0`) are integers within the `0..255` range, while Unicode code points
-  (`t:char/0`) are integers within the `0..0x10FFFF` range. The `IO` module provides
-  the `chardata_to_string/1` function for chardata as the "counter-part" of the
-  `iodata_to_binary/1` function for IO data.
-
-  If you try to use `iodata_to_binary/1` on chardata, it will result in an
-  argument error. For example, let's try to put a code point that is not
-  representable with one byte, like `?π`, inside IO data:
-
-      IO.iodata_to_binary(["The symbol for pi is: ", ?π])
-      #=> ** (ArgumentError) argument error
-
-  If we use chardata instead, it will work as expected:
-
-      iex> IO.chardata_to_string(["The symbol for pi is: ", ?π])
-      "The symbol for pi is: π"
+  * A list of integers representing a string. Any unicode
+    character must be represented with one entry in the list,
+    this entry being an integer with the codepoint value;
+  * A binary in which unicode characters are represented
+    with many bytes (Elixir's default representation);
+  * A list of binaries or a list of char lists (as described above);
+  * If none of the above, `to_binary` is invoked in the
+    given argument;

  """

-  @type device :: atom | pid
-  @type nodata :: {:error, term} | :eof
-  @type chardata :: String.t() | maybe_improper_list(char | chardata, String.t() | [])
-
-  defguardp is_device(term) when is_atom(term) or is_pid(term)
-  defguardp is_iodata(data) when is_list(data) or is_binary(data)
-
  @doc """
-  Reads from the IO `device`.
+  Reads `count` bytes from the IO device. It returns:

-  The `device` is iterated by the given number of characters, line by line if
-  `:line` is given, or until `:eof`.
+  * `data` - The input characters.

-  It returns:
-
-    * `data` - the output characters
-
-    * `:eof` - end of file was encountered
-
-    * `{:error, reason}` - other (rare) error condition;
-      for instance, `{:error, :estale}` if reading from an
-      NFS volume
+  * :eof - End of file was encountered.

+  * {:error, reason} - Other (rare) error condition,
+    for instance {:error, :estale} if reading from an
+    NFS file system.
  """
-  @spec read(device, :eof | :line | non_neg_integer) :: chardata | nodata
-  def read(device \\ :stdio, line_or_chars)
-
-  # TODO: Deprecate me on v1.17
-  def read(device, :all) do
-    with :eof <- read(device, :eof) do
-      with [_ | _] = opts <- :io.getopts(device),
-           false <- Keyword.get(opts, :binary, true) do
-        ''
-      else
-        _ -> ""
-      end
-    end
-  end
-
-  def read(device, :eof) do
-    getn(device, '', :eof)
-  end
-
-  def read(device, :line) do
-    :io.get_line(map_dev(device), '')
-  end
-
-  def read(device, count) when is_integer(count) and count >= 0 do
-    :io.get_chars(map_dev(device), '', count)
+  def read(device // :stdio, count) do
+    Erlang.io.get_chars(map_dev(device), "", count)
  end

  @doc """
-  Reads from the IO `device`. The operation is Unicode unsafe.
+  Read a line from the IO device. It returns:

-  The `device` is iterated by the given number of bytes, line by line if
-  `:line` is given, or until `:eof`.
+  * `data` - The input characters.

-  It returns:
+  * :eof - End of file was encountered.

-    * `data` - the output bytes
+  * {:error, reason} - Other (rare) error condition,
+    for instance {:error, :estale} if reading from an
+    NFS file system.

-    * `:eof` - end of file was encountered
-
-    * `{:error, reason}` - other (rare) error condition;
-      for instance, `{:error, :estale}` if reading from an
-      NFS volume
-
-  Note: do not use this function on IO devices in Unicode mode
-  as it will return the wrong result.
+  This function does the same as `gets/2`,
+  except the prompt is not required as argument.
  """
-  @spec binread(device, :eof | :line | non_neg_integer) :: iodata | nodata
-  def binread(device \\ :stdio, line_or_chars)
-
-  # TODO: Deprecate me on v1.17
-  def binread(device, :all) do
-    with :eof <- binread(device, :eof), do: ""
-  end
-
-  def binread(device, :eof) do
-    binread_eof(map_dev(device), "")
-  end
-
-  def binread(device, :line) do
-    case :file.read_line(map_dev(device)) do
-      {:ok, data} -> data
-      other -> other
-    end
-  end
-
-  def binread(device, count) when is_integer(count) and count >= 0 do
-    case :file.read(map_dev(device), count) do
-      {:ok, data} -> data
-      other -> other
-    end
-  end
-
-  @read_all_size 4096
-  defp binread_eof(mapped_dev, acc) do
-    case :file.read(mapped_dev, @read_all_size) do
-      {:ok, data} -> binread_eof(mapped_dev, acc <> data)
-      :eof -> if acc == "", do: :eof, else: acc
-      other -> other
-    end
+  def readline(device // :stdio) do
+    Erlang.io.get_line(map_dev(device), "")
  end

  @doc """
-  Writes `chardata` to the given `device`.
-
-  By default, the `device` is the standard output.
-
-  ## Examples
-
-      IO.write("sample")
-      #=> sample
-
-      IO.write(:stderr, "error")
-      #=> error
-
-  """
-  @spec write(device, chardata | String.Chars.t()) :: :ok
-  def write(device \\ :stdio, chardata) do
-    :io.put_chars(map_dev(device), to_chardata(chardata))
-  end
-
-  @doc """
-  Writes `iodata` to the given `device`.
-
-  This operation is meant to be used with "raw" devices
-  that are started without an encoding. The given `iodata`
-  is written as is to the device, without conversion. For
-  more information on IO data, see the "IO data" section in
-  the module documentation.
-
-  Use `write/2` for devices with encoding.
-
-  Important: do **not** use this function on IO devices in
-  Unicode mode as it will write the wrong data. In particular,
-  the standard IO device is set to Unicode by default, so writing
-  to stdio with this function will likely result in the wrong data
-  being sent down the wire.
-  """
-  @spec binwrite(device, iodata) :: :ok | {:error, term}
-  def binwrite(device \\ :stdio, iodata) when is_iodata(iodata) do
-    :file.write(map_dev(device), iodata)
-  end
-
-  @doc """
-  Writes `item` to the given `device`, similar to `write/2`,
-  but adds a newline at the end.
-
-  By default, the `device` is the standard output. It returns `:ok`
-  if it succeeds.
-
-  ## Examples
-
-      IO.puts("Hello World!")
-      #=> Hello World!
-
-      IO.puts(:stderr, "error")
-      #=> error
-
-  """
-  @spec puts(device, chardata | String.Chars.t()) :: :ok
-  def puts(device \\ :stdio, item) when is_device(device) do
-    :io.put_chars(map_dev(device), [to_chardata(item), ?\n])
-  end
-
-  @doc """
-  Writes a `message` to stderr, along with the given `stacktrace`.
-
-  This function also notifies the compiler a warning was printed
-  (in case --warnings-as-errors was enabled). It returns `:ok`
-  if it succeeds.
-
-  An empty list can be passed to avoid stacktrace printing.
-
-  ## Examples
-
-      stacktrace = [{MyApp, :main, 1, [file: 'my_app.ex', line: 4]}]
-      IO.warn("variable bar is unused", stacktrace)
-      #=> warning: variable bar is unused
-      #=>   my_app.ex:4: MyApp.main/1
-
-  """
-  @spec warn(chardata | String.Chars.t(), Exception.stacktrace()) :: :ok
-  def warn(message, []) do
-    message = [to_chardata(message), ?\n]
-    :elixir_errors.log_and_print_warning(0, nil, message, message)
-  end
-
-  def warn(message, [{_, _, _, opts} | _] = stacktrace) do
-    message = to_chardata(message)
-    formatted_trace = Enum.map_join(stacktrace, "\n  ", &Exception.format_stacktrace_entry(&1))
-    line = opts[:line]
-    file = opts[:file]
-
-    :elixir_errors.log_and_print_warning(
-      line || 0,
-      file && List.to_string(file),
-      message,
-      [message, ?\n, "  ", formatted_trace, ?\n]
-    )
-  end
-
-  @doc false
-  def warn_once(key, message, stacktrace_drop_levels) do
-    {:current_stacktrace, stacktrace} = Process.info(self(), :current_stacktrace)
-    stacktrace = Enum.drop(stacktrace, stacktrace_drop_levels)
-
-    if :elixir_config.warn(key, stacktrace) do
-      warn(message, stacktrace)
-    else
-      :ok
-    end
-  end
-
-  @doc """
-  Writes a `message` to stderr, along with the current stacktrace.
+  Writes the given argument to the given device.
+  By default the device is the standard output.
+  The argument is expected to be a chardata (i.e.
+  a char list or an unicode binary).

  It returns `:ok` if it succeeds.

-  Do not call this function at the tail of another function. Due to tail
-  call optimization, a stacktrace entry would not be added and the
-  stacktrace would be incorrectly trimmed. Therefore make sure at least
-  one expression (or an atom such as `:ok`) follows the `IO.warn/1` call.
-
  ## Examples

-      IO.warn("variable bar is unused")
-      #=> warning: variable bar is unused
-      #=>   (iex) evaluator.ex:108: IEx.Evaluator.eval/4
+      IO.write "sample"
+      #=> "sample"
+
+      IO.write :stderr, "error"
+      #=> "error"

  """
-  @spec warn(chardata | String.Chars.t()) :: :ok
-  def warn(message) do
-    {:current_stacktrace, stacktrace} = Process.info(self(), :current_stacktrace)
-    warn(message, Enum.drop(stacktrace, 2))
+  def write(device // :stdio, item) do
+    Erlang.io.put_chars map_dev(device), to_iodata(item)
+  end
+
+  def print(device // :stdio, item) do
+    IO.puts "IO.print is deprecated in favor of IO.write"
+    Erlang.io.put_chars map_dev(device), to_iodata(item)
  end

  @doc """
-  Inspects and writes the given `item` to the device.
-
-  It's important to note that it returns the given `item` unchanged.
-  This makes it possible to "spy" on values by inserting an
-  `IO.inspect/2` call almost anywhere in your code, for example,
-  in the middle of a pipeline.
-
-  It enables pretty printing by default with width of
-  80 characters. The width can be changed by explicitly
-  passing the `:width` option.
-
-  The output can be decorated with a label, by providing the `:label`
-  option to easily distinguish it from other `IO.inspect/2` calls.
-  The label will be printed before the inspected `item`.
-
-  See `Inspect.Opts` for a full list of remaining formatting options.
-
-  ## Examples
-
-      IO.inspect(<<0, 1, 2>>, width: 40)
-
-  Prints:
-
-      <<0, 1, 2>>
-
-  We can use the `:label` option to decorate the output:
-
-      IO.inspect(1..100, label: "a wonderful range")
-
-  Prints:
-
-      a wonderful range: 1..100
-
-  The `:label` option is especially useful with pipelines:
-
-      [1, 2, 3]
-      |> IO.inspect(label: "before")
-      |> Enum.map(&(&1 * 2))
-      |> IO.inspect(label: "after")
-      |> Enum.sum()
-
-  Prints:
-
-      before: [1, 2, 3]
-      after: [2, 4, 6]
-
+  Writes the argument to the device, similarly to write
+  but adds a new line at the end. The argument is expected
+  to be a chardata.
  """
-  @spec inspect(item, keyword) :: item when item: var
-  def inspect(item, opts \\ []) do
-    inspect(:stdio, item, opts)
+  def puts(device // :stdio, item) do
+    erl_dev = map_dev(device)
+    Erlang.io.put_chars erl_dev, to_iodata(item)
+    Erlang.io.nl(erl_dev)
  end

  @doc """
-  Inspects `item` according to the given options using the IO `device`.
-
-  See `inspect/2` for a full list of options.
+  Inspects and writes the given argument to the device
+  followed by a new line. Returns the item given.
  """
-  @spec inspect(device, item, keyword) :: item when item: var
-  def inspect(device, item, opts) when is_device(device) and is_list(opts) do
-    label = if label = opts[:label], do: [to_chardata(label), ": "], else: []
-    opts = Inspect.Opts.new(opts)
-    doc = Inspect.Algebra.group(Inspect.Algebra.to_doc(item, opts))
-    chardata = Inspect.Algebra.format(doc, opts.width)
-    puts(device, [label, chardata])
+  def inspect(device // :stdio, item) do
+    puts device, Kernel.inspect(item)
    item
  end

  @doc """
-  Gets a number of bytes from IO device `:stdio`.
+  Gets `count` bytes from the IO device. It returns:

-  If `:stdio` is a Unicode device, `count` implies
-  the number of Unicode code points to be retrieved.
-  Otherwise, `count` is the number of raw bytes to be retrieved.
+  * `data` - The input characters.

-  See `IO.getn/3` for a description of return values.
+  * :eof - End of file was encountered.
+
+  * {:error, reason} - Other (rare) error condition,
+    for instance {:error, :estale} if reading from an
+    NFS file system.
  """
-  @spec getn(
-          device | chardata | String.Chars.t(),
-          pos_integer | :eof | chardata | String.Chars.t()
-        ) ::
-          chardata | nodata
-  def getn(prompt, count \\ 1)
-
-  def getn(prompt, :eof) do
-    getn(:stdio, prompt, :eof)
-  end
-
-  def getn(prompt, count) when is_integer(count) and count > 0 do
-    getn(:stdio, prompt, count)
-  end
-
-  def getn(device, prompt) when not is_integer(prompt) do
-    getn(device, prompt, 1)
+  def getb(device // :stdio, prompt, count // 1) do
+    Erlang.io.get_chars(map_dev(device), to_iodata(prompt), count)
  end

  @doc """
-  Gets a number of bytes from the IO `device`.
+  Reads a line from the IO device. It returns:

-  If the IO `device` is a Unicode device, `count` implies
-  the number of Unicode code points to be retrieved.
-  Otherwise, `count` is the number of raw bytes to be retrieved.
+  * `data` - The characters in the line terminated
+    by a LF (or end of file).

-  It returns:
-
-    * `data` - the input characters
-
-    * `:eof` - end of file was encountered
-
-    * `{:error, reason}` - other (rare) error condition;
-      for instance, `{:error, :estale}` if reading from an
-      NFS volume
+  * :eof - End of file was encountered.

+  * {:error, reason} - Other (rare) error condition,
+    for instance {:error, :estale} if reading from an
+    NFS file system.
  """
-  @spec getn(device, chardata | String.Chars.t(), pos_integer | :eof) :: chardata | nodata
-  def getn(device, prompt, :eof) do
-    getn_eof(map_dev(device), to_chardata(prompt), [])
+  def gets(device // :stdio, prompt) do
+    Erlang.io.get_line(map_dev(device), to_iodata(prompt))
  end

-  def getn(device, prompt, count) when is_integer(count) and count > 0 do
-    :io.get_chars(map_dev(device), to_chardata(prompt), count)
-  end
-
-  defp getn_eof(device, prompt, acc) do
-    case :io.get_line(device, prompt) do
-      line when is_binary(line) or is_list(line) -> getn_eof(device, '', [line | acc])
-      :eof -> wrap_eof(:lists.reverse(acc))
-      other -> other
-    end
-  end
-
-  defp wrap_eof([h | _] = acc) when is_binary(h), do: IO.iodata_to_binary(acc)
-  defp wrap_eof([h | _] = acc) when is_list(h), do: :lists.flatten(acc)
-  defp wrap_eof([]), do: :eof
-
-  @doc ~S"""
-  Reads a line from the IO `device`.
-
-  It returns:
-
-    * `data` - the characters in the line terminated
-      by a line-feed (LF) or end of file (EOF)
-
-    * `:eof` - end of file was encountered
-
-    * `{:error, reason}` - other (rare) error condition;
-      for instance, `{:error, :estale}` if reading from an
-      NFS volume
-
-  ## Examples
-
-  To display "What is your name?" as a prompt and await user input:
-
-      IO.gets("What is your name?\n")
-
-  """
-  @spec gets(device, chardata | String.Chars.t()) :: chardata | nodata
-  def gets(device \\ :stdio, prompt) do
-    :io.get_line(map_dev(device), to_chardata(prompt))
-  end
-
-  @doc """
-  Returns a line-based `IO.Stream` on `:stdio`.
-
-  This is equivalent to:
-
-      IO.stream(:stdio, :line)
-
-  """
-  @doc since: "1.12.0"
-  def stream, do: stream(:stdio, :line)
-
-  @doc """
-  Converts the IO `device` into an `IO.Stream`.
-
-  An `IO.Stream` implements both `Enumerable` and
-  `Collectable`, allowing it to be used for both read
-  and write.
-
-  The `device` is iterated by the given number of characters or line by line if
-  `:line` is given.
-
-  This reads from the IO as UTF-8. Check out
-  `IO.binstream/2` to handle the IO as a raw binary.
-
-  Note that an IO stream has side effects and every time
-  you go over the stream you may get different results.
-
-  `stream/1` has been introduced in Elixir v1.12.0,
-  while `stream/2` has been available since v1.0.0.
-
-  ## Examples
-
-  Here is an example on how we mimic an echo server
-  from the command line:
-
-      Enum.each(IO.stream(:stdio, :line), &IO.write(&1))
-
-  """
-  @spec stream(device, :line | pos_integer) :: Enumerable.t()
-  def stream(device \\ :stdio, line_or_codepoints)
-      when line_or_codepoints == :line
-      when is_integer(line_or_codepoints) and line_or_codepoints > 0 do
-    IO.Stream.__build__(map_dev(device), false, line_or_codepoints)
-  end
-
-  @doc """
-  Returns a raw, line-based `IO.Stream` on `:stdio`. The operation is Unicode unsafe.
-
-  This is equivalent to:
-
-      IO.binstream(:stdio, :line)
-
-  """
-  @doc since: "1.12.0"
-  def binstream, do: binstream(:stdio, :line)
-
-  @doc """
-  Converts the IO `device` into an `IO.Stream`. The operation is Unicode unsafe.
-
-  An `IO.Stream` implements both `Enumerable` and
-  `Collectable`, allowing it to be used for both read
-  and write.
-
-  The `device` is iterated by the given number of bytes or line by line if
-  `:line` is given. This reads from the IO device as a raw binary.
-
-  Note that an IO stream has side effects and every time
-  you go over the stream you may get different results.
-
-  Finally, do not use this function on IO devices in Unicode
-  mode as it will return the wrong result.
-
-  `binstream/1` has been introduced in Elixir v1.12.0,
-  while `binstream/2` has been available since v1.0.0.
-  """
-  @spec binstream(device, :line | pos_integer) :: Enumerable.t()
-  def binstream(device \\ :stdio, line_or_bytes)
-      when line_or_bytes == :line
-      when is_integer(line_or_bytes) and line_or_bytes > 0 do
-    IO.Stream.__build__(map_dev(device), true, line_or_bytes)
-  end
-
-  @doc """
-  Converts chardata into a string.
-
-  For more information about chardata, see the ["Chardata"](#module-chardata)
-  section in the module documentation.
-
-  In case the conversion fails, it raises an `UnicodeConversionError`.
-  If a string is given, it returns the string itself.
-
-  ## Examples
-
-      iex> IO.chardata_to_string([0x00E6, 0x00DF])
-      "æß"
-
-      iex> IO.chardata_to_string([0x0061, "bc"])
-      "abc"
-
-      iex> IO.chardata_to_string("string")
-      "string"
-
-  """
-  @spec chardata_to_string(chardata) :: String.t()
-  def chardata_to_string(chardata)
-
-  def chardata_to_string(string) when is_binary(string) do
-    string
-  end
-
-  def chardata_to_string(list) when is_list(list) do
-    List.to_string(list)
-  end
-
-  @doc """
-  Converts IO data into a binary
-
-  The operation is Unicode unsafe.
-
-  Note that this function treats integers in the given IO data as
-  raw bytes and does not perform any kind of encoding conversion.
-  If you want to convert from a charlist to a UTF-8-encoded string,
-  use `chardata_to_string/1` instead. For more information about
-  IO data and chardata, see the ["IO data"](#module-io-data) section in the
-  module documentation.
-
-  If this function receives a binary, the same binary is returned.
-
-  Inlined by the compiler.
-
-  ## Examples
-
-      iex> bin1 = <<1, 2, 3>>
-      iex> bin2 = <<4, 5>>
-      iex> bin3 = <<6>>
-      iex> IO.iodata_to_binary([bin1, 1, [2, 3, bin2], 4 | bin3])
-      <<1, 2, 3, 1, 2, 3, 4, 5, 4, 6>>
-
-      iex> bin = <<1, 2, 3>>
-      iex> IO.iodata_to_binary(bin)
-      <<1, 2, 3>>
-
-  """
-  @spec iodata_to_binary(iodata) :: binary
-  def iodata_to_binary(iodata) do
-    :erlang.iolist_to_binary(iodata)
-  end
-
-  @doc """
-  Returns the size of an IO data.
-
-  For more information about IO data, see the ["IO data"](#module-io-data)
-  section in the module documentation.
-
-  Inlined by the compiler.
-
-  ## Examples
-
-      iex> IO.iodata_length([1, 2 | <<3, 4>>])
-      4
-
-  """
-  @spec iodata_length(iodata) :: non_neg_integer
-  def iodata_length(iodata) do
-    :erlang.iolist_size(iodata)
-  end
-
-  @doc false
-  def each_stream(device, line_or_codepoints) do
-    case read(device, line_or_codepoints) do
-      :eof ->
-        {:halt, device}
-
-      {:error, reason} ->
-        raise IO.StreamError, reason: reason
-
-      data ->
-        {[data], device}
-    end
-  end
-
-  @doc false
-  def each_binstream(device, line_or_chars) do
-    case binread(device, line_or_chars) do
-      :eof ->
-        {:halt, device}
-
-      {:error, reason} ->
-        raise IO.StreamError, reason: reason
-
-      data ->
-        {[data], device}
-    end
-  end
-
-  @compile {:inline, map_dev: 1, to_chardata: 1}
-
-  # Map the Elixir names for standard IO and error to Erlang names
-  defp map_dev(:stdio), do: :standard_io
+  # Map the Elixir names for standard io and error to Erlang names
+  defp map_dev(:stdio),  do: :standard_io
  defp map_dev(:stderr), do: :standard_error
-  defp map_dev(other) when is_atom(other) or is_pid(other) or is_tuple(other), do: other
+  defp map_dev(other),   do: other

-  defp to_chardata(list) when is_list(list), do: list
-  defp to_chardata(other), do: to_string(other)
+  defp to_iodata(io) when is_list(io) or is_binary(io), do: io
+  defp to_iodata(other), do: to_binary(other)
 end
@@ -1,305 +0,0 @@
-defmodule IO.ANSI.Sequence do
-  @moduledoc false
-
-  defmacro defsequence(name, code, terminator \\ "m") do
-    quote bind_quoted: [name: name, code: code, terminator: terminator] do
-      def unquote(name)() do
-        "\e[#{unquote(code)}#{unquote(terminator)}"
-      end
-
-      defp format_sequence(unquote(name)) do
-        unquote(name)()
-      end
-    end
-  end
-end
-
-defmodule IO.ANSI do
-  @moduledoc """
-  Functionality to render ANSI escape sequences.
-
-  [ANSI escape sequences](https://en.wikipedia.org/wiki/ANSI_escape_code)
-  are characters embedded in text used to control formatting, color, and
-  other output options on video text terminals.
-
-  ANSI escapes are typically enabled on all Unix terminals. They are also
-  available on Windows consoles from Windows 10, although it must be
-  explicitly enabled for the current user in the registry by running the
-  following command:
-
-      reg add HKCU\\Console /v VirtualTerminalLevel /t REG_DWORD /d 1
-
-  After running the command above, you must restart your current console.
-
-  ## Examples
-
-  Because the ANSI escape sequences are embedded in text, the normal usage of
-  these functions is to concatenate their output with text.
-
-      formatted_text = IO.ANSI.blue_background() <> "Example" <> IO.ANSI.reset()
-      IO.puts(formatted_text)
-
-  A higher level and more convenient API is also available via `IO.ANSI.format/1`,
-  where you use atoms to represent each ANSI escape sequence and by default
-  checks if ANSI is enabled:
-
-      IO.puts(IO.ANSI.format([:blue_background, "Example"]))
-
-  In case ANSI is disabled, the ANSI escape sequences are simply discarded.
-  """
-
-  import IO.ANSI.Sequence
-
-  @type ansicode :: atom
-  @type ansilist ::
-          maybe_improper_list(char | ansicode | binary | ansilist, binary | ansicode | [])
-  @type ansidata :: ansilist | ansicode | binary
-
-  @doc """
-  Checks if ANSI coloring is supported and enabled on this machine.
-
-  This function simply reads the configuration value for
-  `:ansi_enabled` in the `:elixir` application. The value is by
-  default `false` unless Elixir can detect during startup that
-  both `stdout` and `stderr` are terminals.
-  """
-  @spec enabled? :: boolean
-  def enabled? do
-    Application.get_env(:elixir, :ansi_enabled, false)
-  end
-
-  @doc "Sets foreground color."
-  @spec color(0..255) :: String.t()
-  def color(code) when code in 0..255, do: "\e[38;5;#{code}m"
-
-  @doc ~S"""
-  Sets the foreground color from individual RGB values.
-
-  Valid values for each color are in the range 0 to 5.
-  """
-  @spec color(0..5, 0..5, 0..5) :: String.t()
-  def color(r, g, b) when r in 0..5 and g in 0..5 and b in 0..5 do
-    color(16 + 36 * r + 6 * g + b)
-  end
-
-  @doc "Sets background color."
-  @spec color_background(0..255) :: String.t()
-  def color_background(code) when code in 0..255, do: "\e[48;5;#{code}m"
-
-  @doc ~S"""
-  Sets the background color from individual RGB values.
-
-  Valid values for each color are in the range 0 to 5.
-  """
-  @spec color_background(0..5, 0..5, 0..5) :: String.t()
-  def color_background(r, g, b) when r in 0..5 and g in 0..5 and b in 0..5 do
-    color_background(16 + 36 * r + 6 * g + b)
-  end
-
-  @doc "Resets all attributes."
-  defsequence(:reset, 0)
-
-  @doc "Bright (increased intensity) or bold."
-  defsequence(:bright, 1)
-
-  @doc "Faint (decreased intensity). Not widely supported."
-  defsequence(:faint, 2)
-
-  @doc "Italic: on. Not widely supported. Sometimes treated as inverse."
-  defsequence(:italic, 3)
-
-  @doc "Underline: single."
-  defsequence(:underline, 4)
-
-  @doc "Blink: slow. Less than 150 per minute."
-  defsequence(:blink_slow, 5)
-
-  @doc "Blink: rapid. MS-DOS ANSI.SYS; 150 per minute or more; not widely supported."
-  defsequence(:blink_rapid, 6)
-
-  @doc "Image: negative. Swap foreground and background."
-  defsequence(:inverse, 7)
-
-  @doc "Image: negative. Swap foreground and background."
-  defsequence(:reverse, 7)
-
-  @doc "Conceal. Not widely supported."
-  defsequence(:conceal, 8)
-
-  @doc "Crossed-out. Characters legible, but marked for deletion. Not widely supported."
-  defsequence(:crossed_out, 9)
-
-  @doc "Sets primary (default) font."
-  defsequence(:primary_font, 10)
-
-  for font_n <- [1, 2, 3, 4, 5, 6, 7, 8, 9] do
-    @doc "Sets alternative font #{font_n}."
-    defsequence(:"font_#{font_n}", font_n + 10)
-  end
-
-  @doc "Normal color or intensity."
-  defsequence(:normal, 22)
-
-  @doc "Not italic."
-  defsequence(:not_italic, 23)
-
-  @doc "Underline: none."
-  defsequence(:no_underline, 24)
-
-  @doc "Blink: off."
-  defsequence(:blink_off, 25)
-
-  @doc "Image: positive. Normal foreground and background."
-  defsequence(:inverse_off, 27)
-
-  @doc "Image: positive. Normal foreground and background."
-  defsequence(:reverse_off, 27)
-
-  colors = [:black, :red, :green, :yellow, :blue, :magenta, :cyan, :white]
-
-  for {color, code} <- Enum.with_index(colors) do
-    @doc "Sets foreground color to #{color}."
-    defsequence(color, code + 30)
-
-    @doc "Sets foreground color to light #{color}."
-    defsequence(:"light_#{color}", code + 90)
-
-    @doc "Sets background color to #{color}."
-    defsequence(:"#{color}_background", code + 40)
-
-    @doc "Sets background color to light #{color}."
-    defsequence(:"light_#{color}_background", code + 100)
-  end
-
-  @doc "Default text color."
-  defsequence(:default_color, 39)
-
-  @doc "Default background color."
-  defsequence(:default_background, 49)
-
-  @doc "Framed."
-  defsequence(:framed, 51)
-
-  @doc "Encircled."
-  defsequence(:encircled, 52)
-
-  @doc "Overlined."
-  defsequence(:overlined, 53)
-
-  @doc "Not framed or encircled."
-  defsequence(:not_framed_encircled, 54)
-
-  @doc "Not overlined."
-  defsequence(:not_overlined, 55)
-
-  @doc "Sends cursor home."
-  defsequence(:home, "", "H")
-
-  @doc """
-  Sends cursor to the absolute position specified by `line` and `column`.
-
-  Line `0` and column `0` would mean the top left corner.
-  """
-  @spec cursor(non_neg_integer, non_neg_integer) :: String.t()
-  def cursor(line, column)
-      when is_integer(line) and line >= 0 and is_integer(column) and column >= 0 do
-    "\e[#{line};#{column}H"
-  end
-
-  @doc "Sends cursor `lines` up."
-  @spec cursor_up(pos_integer) :: String.t()
-  def cursor_up(lines \\ 1) when is_integer(lines) and lines >= 1, do: "\e[#{lines}A"
-
-  @doc "Sends cursor `lines` down."
-  @spec cursor_down(pos_integer) :: String.t()
-  def cursor_down(lines \\ 1) when is_integer(lines) and lines >= 1, do: "\e[#{lines}B"
-
-  @doc "Sends cursor `columns` to the right."
-  @spec cursor_right(pos_integer) :: String.t()
-  def cursor_right(columns \\ 1) when is_integer(columns) and columns >= 1, do: "\e[#{columns}C"
-
-  @doc "Sends cursor `columns` to the left."
-  @spec cursor_left(pos_integer) :: String.t()
-  def cursor_left(columns \\ 1) when is_integer(columns) and columns >= 1, do: "\e[#{columns}D"
-
-  @doc "Clears screen."
-  defsequence(:clear, "2", "J")
-
-  @doc "Clears line."
-  defsequence(:clear_line, "2", "K")
-
-  defp format_sequence(other) do
-    raise ArgumentError, "invalid ANSI sequence specification: #{inspect(other)}"
-  end
-
-  @doc ~S"""
-  Formats a chardata-like argument by converting named ANSI sequences into actual
-  ANSI codes.
-
-  The named sequences are represented by atoms.
-
-  It will also append an `IO.ANSI.reset/0` to the chardata when a conversion is
-  performed. If you don't want this behaviour, use `format_fragment/2`.
-
-  An optional boolean parameter can be passed to enable or disable
-  emitting actual ANSI codes. When `false`, no ANSI codes will be emitted.
-  By default checks if ANSI is enabled using the `enabled?/0` function.
-
-  ## Examples
-
-      iex> IO.ANSI.format(["Hello, ", :red, :bright, "world!"], true)
-      [[[[[[], "Hello, "] | "\e[31m"] | "\e[1m"], "world!"] | "\e[0m"]
-
-  """
-  def format(chardata, emit? \\ enabled?()) when is_boolean(emit?) do
-    do_format(chardata, [], [], emit?, :maybe)
-  end
-
-  @doc ~S"""
-  Formats a chardata-like argument by converting named ANSI sequences into actual
-  ANSI codes.
-
-  The named sequences are represented by atoms.
-
-  An optional boolean parameter can be passed to enable or disable
-  emitting actual ANSI codes. When `false`, no ANSI codes will be emitted.
-  By default checks if ANSI is enabled using the `enabled?/0` function.
-
-  ## Examples
-
-      iex> IO.ANSI.format_fragment([:bright, 'Word'], true)
-      [[[[[[] | "\e[1m"], 87], 111], 114], 100]
-
-  """
-  def format_fragment(chardata, emit? \\ enabled?()) when is_boolean(emit?) do
-    do_format(chardata, [], [], emit?, false)
-  end
-
-  defp do_format([term | rest], rem, acc, emit?, append_reset) do
-    do_format(term, [rest | rem], acc, emit?, append_reset)
-  end
-
-  defp do_format(term, rem, acc, true, append_reset) when is_atom(term) do
-    do_format([], rem, [acc | format_sequence(term)], true, !!append_reset)
-  end
-
-  defp do_format(term, rem, acc, false, append_reset) when is_atom(term) do
-    do_format([], rem, acc, false, append_reset)
-  end
-
-  defp do_format(term, rem, acc, emit?, append_reset) when not is_list(term) do
-    do_format([], rem, [acc, term], emit?, append_reset)
-  end
-
-  defp do_format([], [next | rest], acc, emit?, append_reset) do
-    do_format(next, rest, acc, emit?, append_reset)
-  end
-
-  defp do_format([], [], acc, true, true) do
-    [acc | IO.ANSI.reset()]
-  end
-
-  defp do_format([], [], acc, _emit?, _append_reset) do
-    acc
-  end
-end
@@ -1,962 +0,0 @@
-defmodule IO.ANSI.Docs do
-  @moduledoc false
-
-  @bullet_text_unicode "• "
-  @bullet_text_ascii "* "
-  @bullets [?*, ?-, ?+]
-  @spaces [" ", "\n", "\t"]
-
-  @doc """
-  The default options used by this module.
-
-  The supported keys are:
-
-    * `:enabled`           - toggles coloring on and off (true)
-    * `:doc_bold`          - bold text (bright)
-    * `:doc_code`          - code blocks (cyan)
-    * `:doc_headings`      - h1, h2, h3, h4, h5, h6 headings (yellow)
-    * `:doc_metadata`      - documentation metadata keys (yellow)
-    * `:doc_quote`         - leading quote character `> ` (light black)
-    * `:doc_inline_code`   - inline code (cyan)
-    * `:doc_table_heading` - the style for table headings
-    * `:doc_title`         - top level heading (reverse, yellow)
-    * `:doc_underline`     - underlined text (underline)
-    * `:width`             - the width to format the text (80)
-
-  Values for the color settings are strings with
-  comma-separated ANSI values.
-  """
-  @spec default_options() :: keyword
-  def default_options do
-    [
-      enabled: true,
-      doc_bold: [:bright],
-      doc_code: [:cyan],
-      doc_headings: [:yellow],
-      doc_metadata: [:yellow],
-      doc_quote: [:light_black],
-      doc_inline_code: [:cyan],
-      doc_table_heading: [:reverse],
-      doc_title: [:reverse, :yellow],
-      doc_underline: [:underline],
-      width: 80
-    ]
-  end
-
-  @doc """
-  Prints the head of the documentation (i.e. the function signature).
-
-  See `default_options/0` for docs on the supported options.
-  """
-  @spec print_headings([String.t()], keyword) :: :ok
-  def print_headings(headings, options \\ []) do
-    options = Keyword.merge(default_options(), options)
-    newline_after_block(options)
-    width = options[:width]
-
-    for heading <- headings do
-      padding = div(width + String.length(heading), 2)
-      heading = String.pad_leading(heading, padding)
-      heading = if options[:enabled], do: String.pad_trailing(heading, width), else: heading
-      write(:doc_title, heading, options)
-    end
-
-    newline_after_block(options)
-  end
-
-  @doc """
-  Prints documentation metadata (only `delegate_to`, `deprecated`, `guard`, and `since` for now).
-
-  See `default_options/0` for docs on the supported options.
-  """
-  @spec print_metadata(map, keyword) :: :ok
-  def print_metadata(metadata, options \\ []) when is_map(metadata) do
-    options = Keyword.merge(default_options(), options)
-    print_each_metadata(metadata, options) && IO.write("\n")
-  end
-
-  @metadata_filter [:deprecated, :guard, :since]
-
-  defp print_each_metadata(metadata, options) do
-    Enum.reduce(metadata, false, fn
-      {key, value}, _printed when is_binary(value) and key in @metadata_filter ->
-        label = metadata_label(key, options)
-        indent = String.duplicate(" ", length_without_escape(label, 0) + 1)
-        write_with_wrap([label | String.split(value, @spaces)], options[:width], indent, true, "")
-
-      {key, value}, _printed when is_boolean(value) and key in @metadata_filter ->
-        IO.puts([metadata_label(key, options), ?\s, to_string(value)])
-
-      {:delegate_to, {m, f, a}}, _printed ->
-        label = metadata_label(:delegate_to, options)
-        IO.puts([label, ?\s, Exception.format_mfa(m, f, a)])
-
-      _metadata, printed ->
-        printed
-    end)
-  end
-
-  defp metadata_label(key, options) do
-    "#{color(:doc_metadata, options)}#{key}:#{maybe_reset(options)}"
-  end
-
-  @doc """
-  Prints the documentation body `doc` according to `format`.
-
-  It takes a set of `options` defined in `default_options/0`.
-  """
-  @spec print(term(), String.t(), keyword) :: :ok
-  def print(doc, format, options \\ [])
-
-  def print(doc, "text/markdown", options) when is_binary(doc) and is_list(options) do
-    print_markdown(doc, options)
-  end
-
-  def print(doc, "application/erlang+html", options) when is_list(options) do
-    print_erlang_html(doc, options)
-  end
-
-  def print(_doc, format, options) when is_binary(format) and is_list(options) do
-    IO.puts("\nUnknown documentation format #{inspect(format)}\n")
-  end
-
-  ## Erlang+html
-
-  def print_erlang_html(doc, options) do
-    options = Keyword.merge(default_options(), options)
-    IO.write(traverse_erlang_html(doc, "", options))
-  end
-
-  defp traverse_erlang_html(text, _indent, _options) when is_binary(text) do
-    text
-  end
-
-  defp traverse_erlang_html(nodes, indent, options) when is_list(nodes) do
-    for node <- nodes do
-      traverse_erlang_html(node, indent, options)
-    end
-  end
-
-  defp traverse_erlang_html({:div, [class: class] ++ _, entries}, indent, options) do
-    prefix = indent <> quote_prefix(options)
-
-    content =
-      entries
-      |> traverse_erlang_html(indent, options)
-      |> IO.iodata_to_binary()
-      |> String.trim_trailing()
-
-    [
-      prefix,
-      class |> to_string() |> String.upcase(),
-      "\n#{prefix}\n#{prefix}" | String.replace(content, "\n", "\n#{prefix}")
-    ]
-    |> newline_cons()
-  end
-
-  defp traverse_erlang_html({:p, _, entries}, indent, options) do
-    [indent | handle_erlang_html_text(entries, indent, options)]
-  end
-
-  defp traverse_erlang_html({:h1, _, entries}, indent, options) do
-    entries |> traverse_erlang_html(indent, options) |> heading(1, options) |> newline_cons()
-  end
-
-  defp traverse_erlang_html({:h2, _, entries}, indent, options) do
-    entries |> traverse_erlang_html(indent, options) |> heading(2, options) |> newline_cons()
-  end
-
-  defp traverse_erlang_html({:h3, _, entries}, indent, options) do
-    entries |> traverse_erlang_html(indent, options) |> heading(3, options) |> newline_cons()
-  end
-
-  defp traverse_erlang_html({:h4, _, entries}, indent, options) do
-    entries |> traverse_erlang_html(indent, options) |> heading(4, options) |> newline_cons()
-  end
-
-  defp traverse_erlang_html({:h5, _, entries}, indent, options) do
-    entries |> traverse_erlang_html(indent, options) |> heading(5, options) |> newline_cons()
-  end
-
-  defp traverse_erlang_html({:h6, _, entries}, indent, options) do
-    entries |> traverse_erlang_html(indent, options) |> heading(6, options) |> newline_cons()
-  end
-
-  defp traverse_erlang_html({:br, _, []}, _indent, _options) do
-    []
-  end
-
-  defp traverse_erlang_html({:i, _, entries}, indent, options) do
-    inline_text("_", traverse_erlang_html(entries, indent, options), options)
-  end
-
-  defp traverse_erlang_html({:em, _, entries}, indent, options) do
-    inline_text("*", traverse_erlang_html(entries, indent, options), options)
-  end
-
-  defp traverse_erlang_html({tag, _, entries}, indent, options) when tag in [:strong, :b] do
-    inline_text("**", traverse_erlang_html(entries, indent, options), options)
-  end
-
-  defp traverse_erlang_html({:code, _, entries}, indent, options) do
-    inline_text("`", traverse_erlang_html(entries, indent, options), options)
-  end
-
-  defp traverse_erlang_html({:pre, _, [{:code, _, entries}]}, indent, options) do
-    string =
-      entries
-      |> traverse_erlang_html(indent, options)
-      |> IO.iodata_to_binary()
-
-    ["#{indent}    ", String.replace(string, "\n", "\n#{indent}    ")] |> newline_cons()
-  end
-
-  defp traverse_erlang_html({:a, attributes, entries}, indent, options) do
-    if href = attributes[:href] do
-      [traverse_erlang_html(entries, indent, options), ?\s, ?(, href, ?)]
-    else
-      traverse_erlang_html(entries, indent, options)
-    end
-  end
-
-  defp traverse_erlang_html({:dl, _, entries}, indent, options) do
-    traverse_erlang_html(entries, indent, options)
-  end
-
-  defp traverse_erlang_html({:dt, _, entries}, indent, options) do
-    [
-      "#{indent}  ",
-      bullet_text(options) | handle_erlang_html_text(entries, indent <> "    ", options)
-    ]
-  end
-
-  defp traverse_erlang_html({:dd, _, entries}, indent, options) do
-    ["#{indent}    " | handle_erlang_html_text(entries, indent <> "    ", options)]
-  end
-
-  defp traverse_erlang_html({:ul, attributes, entries}, indent, options) do
-    if attributes[:class] == "types" do
-      types =
-        for {:li, _, lines} <- entries,
-            line <- lines,
-            do: ["#{indent}    ", traverse_erlang_html(line, indent <> "    ", options), ?\n]
-
-      if types != [] do
-        ["#{indent}Typespecs:\n\n", types, ?\n]
-      else
-        []
-      end
-    else
-      for {:li, _, lines} <- entries do
-        [
-          "#{indent}  ",
-          bullet_text(options) | handle_erlang_html_text(lines, indent <> "    ", options)
-        ]
-      end
-    end
-  end
-
-  defp traverse_erlang_html({:ol, _, entries}, indent, options) do
-    for {{:li, _, lines}, i} <- Enum.with_index(entries, 1) do
-      [
-        "#{indent}  ",
-        Integer.to_string(i),
-        ". " | handle_erlang_html_text(lines, indent <> "     ", options)
-      ]
-    end
-  end
-
-  defp traverse_erlang_html({tag, _, entries}, indent, options) do
-    [
-      indent <> "<#{tag}>\n",
-      traverse_erlang_html(entries, indent <> "    ", options)
-      |> IO.iodata_to_binary()
-      |> String.trim_trailing(),
-      "\n" <> indent <> "</#{tag}>"
-    ]
-    |> newline_cons()
-  end
-
-  defp newline_cons(text) do
-    [text | "\n\n"]
-  end
-
-  defp handle_erlang_html_text(entries, indent, options) do
-    if Enum.all?(entries, &inline_html?/1) do
-      entries
-      |> traverse_erlang_html(indent, options)
-      |> IO.iodata_to_binary()
-      |> String.split(@spaces)
-      |> wrap_text(options[:width], indent, true, "", [])
-      |> tl()
-      |> newline_cons()
-    else
-      entries
-      |> traverse_erlang_html(indent, options)
-      |> IO.iodata_to_binary()
-      |> String.trim_leading()
-    end
-  end
-
-  defp inline_html?(binary) when is_binary(binary), do: true
-  defp inline_html?({tag, _, _}) when tag in [:a, :code, :em, :i, :strong, :b, :br], do: true
-  defp inline_html?(_), do: false
-
-  ## Markdown
-
-  def print_markdown(doc, options) do
-    options = Keyword.merge(default_options(), options)
-
-    doc
-    |> String.split(["\r\n", "\n"], trim: false)
-    |> Enum.map(&String.trim_trailing/1)
-    |> process([], "", options)
-  end
-
-  defp process([], text, indent, options) do
-    write_text(text, indent, options)
-  end
-
-  defp process(["# " <> _ = heading | rest], text, indent, options) do
-    write_heading(heading, rest, text, indent, options)
-  end
-
-  defp process(["## " <> _ = heading | rest], text, indent, options) do
-    write_heading(heading, rest, text, indent, options)
-  end
-
-  defp process(["### " <> _ = heading | rest], text, indent, options) do
-    write_heading(heading, rest, text, indent, options)
-  end
-
-  defp process(["#### " <> _ = heading | rest], text, indent, options) do
-    write_heading(heading, rest, text, indent, options)
-  end
-
-  defp process(["##### " <> _ = heading | rest], text, indent, options) do
-    write_heading(heading, rest, text, indent, options)
-  end
-
-  defp process(["###### " <> _ = heading | rest], text, indent, options) do
-    write_heading(heading, rest, text, indent, options)
-  end
-
-  defp process([">" <> line | rest], text, indent, options) do
-    write_text(text, indent, options)
-    process_quote(rest, [line], indent, options)
-  end
-
-  defp process(["" | rest], text, indent, options) do
-    write_text(text, indent, options)
-    process(rest, [], indent, options)
-  end
-
-  defp process(["    " <> line | rest], text, indent, options) do
-    write_text(text, indent, options)
-    process_code(rest, [line], indent, options)
-  end
-
-  defp process(["```" <> _line | rest], text, indent, options) do
-    process_fenced_code_block(rest, text, indent, options, _delimiter = "```")
-  end
-
-  defp process(["~~~" <> _line | rest], text, indent, options) do
-    process_fenced_code_block(rest, text, indent, options, _delimiter = "~~~")
-  end
-
-  defp process(all = [line | rest], text, indent, options) do
-    {stripped, count} = strip_spaces(line, 0, :infinity)
-
-    cond do
-      link_label?(stripped, count) ->
-        write_text([line], indent, options, true)
-        process(rest, text, indent, options)
-
-      table_line?(stripped) and rest != [] and table_line?(hd(rest)) ->
-        write_text(text, indent, options)
-        process_table(all, indent, options)
-
-      true ->
-        process_rest(stripped, rest, count, text, indent, options)
-    end
-  end
-
-  ### Headings
-
-  defp write_heading(heading, rest, text, indent, options) do
-    write_text(text, indent, options)
-    write(:doc_headings, heading, options)
-    newline_after_block(options)
-    process(rest, [], "", options)
-  end
-
-  ### Quotes
-
-  defp process_quote([], lines, indent, options) do
-    write_quote(lines, indent, options, false)
-  end
-
-  defp process_quote([">", ">" <> line | rest], lines, indent, options) do
-    write_quote(lines, indent, options, true)
-    write_empty_quote_line(options)
-    process_quote(rest, [line], indent, options)
-  end
-
-  defp process_quote([">" <> line | rest], lines, indent, options) do
-    process_quote(rest, [line | lines], indent, options)
-  end
-
-  defp process_quote(rest, lines, indent, options) do
-    write_quote(lines, indent, options, false)
-    process(rest, [], indent, options)
-  end
-
-  defp write_quote(lines, indent, options, no_wrap) do
-    lines
-    |> Enum.map(&String.trim/1)
-    |> Enum.reverse()
-    |> write_lines(
-      indent,
-      options,
-      no_wrap,
-      quote_prefix(options)
-    )
-  end
-
-  defp write_empty_quote_line(options) do
-    options
-    |> quote_prefix()
-    |> IO.puts()
-  end
-
-  ### Lists
-
-  defp process_rest(stripped, rest, count, text, indent, options) do
-    case stripped do
-      <<bullet, ?\s, item::binary>> when bullet in @bullets ->
-        write_text(text, indent, options)
-        process_list(bullet_text(options), item, rest, count, indent, options)
-
-      <<d1, ?., ?\s, item::binary>> when d1 in ?0..?9 ->
-        write_text(text, indent, options)
-        process_list(<<d1, ?., ?\s>>, item, rest, count, indent, options)
-
-      <<d1, d2, ?., ?\s, item::binary>> when d1 in ?0..?9 and d2 in ?0..?9 ->
-        write_text(text, indent, options)
-        process_list(<<d1, d2, ?., ?\s>>, item, rest, count, indent, options)
-
-      _ ->
-        process(rest, [stripped | text], indent, options)
-    end
-  end
-
-  defp process_list(entry, line, rest, count, indent, options) do
-    # The first list always win some extra padding
-    entry = if indent == "", do: "  " <> entry, else: entry
-    new_indent = indent <> String.duplicate(" ", String.length(entry))
-
-    {contents, rest, done} =
-      process_list_next(rest, count, byte_size(new_indent) - byte_size(indent), [])
-
-    process(contents, [indent <> entry <> line, :no_wrap], new_indent, options)
-
-    if done, do: newline_after_block(options)
-    process(rest, [], indent, options)
-  end
-
-  defp process_list_next([line | rest], count, max, acc) do
-    {stripped, next_count} = strip_spaces(line, 0, max)
-
-    case process_list_next_kind(stripped, rest, count, next_count) do
-      :next -> process_list_next(rest, count, max, [stripped | acc])
-      :done -> {Enum.reverse(acc), [line | rest], true}
-      :list -> {Enum.reverse(acc), [line | rest], false}
-    end
-  end
-
-  defp process_list_next([], _count, _max, acc) do
-    {Enum.reverse(acc), [], true}
-  end
-
-  defp process_list_next_kind(stripped, rest, count, next_count) do
-    case {stripped, rest} do
-      {<<bullet, ?\s, _::binary>>, _} when bullet in @bullets and next_count <= count ->
-        :list
-
-      {<<d1, ?., ?\s, _::binary>>, _} when d1 in ?0..?9 and next_count <= count ->
-        :list
-
-      {<<d1, d2, ?., ?\s, _::binary>>, _}
-      when d1 in ?0..?9 and d2 in ?0..?9 and next_count <= count ->
-        :list
-
-      {"", [" " <> _ | _]} ->
-        :next
-
-      {"", _} ->
-        :done
-
-      _ ->
-        :next
-    end
-  end
-
-  ### Text
-
-  defp write_text(text, indent, options) do
-    case Enum.reverse(text) do
-      [:no_wrap | rest] -> write_text(rest, indent, options, true)
-      rest -> write_text(rest, indent, options, false)
-    end
-  end
-
-  defp write_text([], _indent, _options, _no_wrap) do
-    :ok
-  end
-
-  defp write_text(lines, indent, options, no_wrap) do
-    write_lines(lines, indent, options, no_wrap, "")
-  end
-
-  defp write_lines(lines, indent, options, no_wrap, prefix) do
-    lines
-    |> Enum.join(" ")
-    |> format_text(options)
-    |> String.split(@spaces)
-    |> write_with_wrap(options[:width] - byte_size(indent), indent, no_wrap, prefix)
-
-    unless no_wrap, do: newline_after_block(options)
-  end
-
-  defp format_text(text, options) do
-    text
-    |> handle_links()
-    |> handle_inline(options)
-  end
-
-  ### Code blocks
-
-  defp process_code([], code, indent, options) do
-    write_code(code, indent, options)
-  end
-
-  # Blank line between code blocks
-  defp process_code(["", "    " <> line | rest], code, indent, options) do
-    process_code(rest, [line, "" | code], indent, options)
-  end
-
-  defp process_code(["    " <> line | rest], code, indent, options) do
-    process_code(rest, [line | code], indent, options)
-  end
-
-  defp process_code(rest, code, indent, options) do
-    write_code(code, indent, options)
-    process(rest, [], indent, options)
-  end
-
-  defp process_fenced_code_block(rest, text, indent, options, delimiter) do
-    write_text(text, indent, options)
-    process_fenced_code(rest, [], indent, options, delimiter)
-  end
-
-  defp process_fenced_code([], code, indent, options, _delimiter) do
-    write_code(code, indent, options)
-  end
-
-  defp process_fenced_code([line | rest], code, indent, options, delimiter) do
-    if line === delimiter do
-      process_code(rest, code, indent, options)
-    else
-      process_fenced_code(rest, [line | code], indent, options, delimiter)
-    end
-  end
-
-  defp write_code(code, indent, options) do
-    write(:doc_code, "#{indent}    #{Enum.join(Enum.reverse(code), "\n#{indent}    ")}", options)
-    newline_after_block(options)
-  end
-
-  ### Tables
-
-  defp process_table(lines, indent, options) do
-    {table, rest} = Enum.split_while(lines, &table_line?/1)
-    table_lines(table, options)
-    newline_after_block(options)
-    process(rest, [], indent, options)
-  end
-
-  defp table_lines(lines, options) do
-    lines = Enum.map(lines, &split_into_columns(&1, options))
-    count = Enum.map(lines, &length/1) |> Enum.max()
-    lines = Enum.map(lines, &pad_to_number_of_columns(&1, count))
-
-    widths =
-      for line <- lines do
-        if table_header?(line) do
-          for _ <- line, do: 0
-        else
-          for {_col, length} <- line, do: length
-        end
-      end
-
-    col_widths = Enum.reduce(widths, List.duplicate(0, count), &max_column_widths/2)
-    render_table(lines, col_widths, options)
-  end
-
-  defp split_into_columns(line, options) do
-    line
-    |> String.trim(" ")
-    |> String.trim("|")
-    |> String.split(~r{(?<!\\)\|})
-    |> Enum.map(&render_column(&1, options))
-  end
-
-  defp render_column(col, options) do
-    col =
-      col
-      |> String.trim()
-      |> String.replace("\\\|", "|")
-      |> handle_links
-      |> handle_inline(options)
-
-    {col, length_without_escape(col, 0)}
-  end
-
-  defp pad_to_number_of_columns(cols, col_count),
-    do: cols ++ List.duplicate({"", 0}, col_count - length(cols))
-
-  defp max_column_widths(cols, widths),
-    do: Enum.zip(cols, widths) |> Enum.map(fn {a, b} -> max(a, b) end)
-
-  # If second line is heading separator, use the heading style on the first
-  defp render_table([first, second | rest], widths, options) do
-    combined = Enum.zip(first, widths)
-
-    if table_header?(second) do
-      alignments = Enum.map(second, &column_alignment/1)
-      options = Keyword.put_new(options, :alignments, alignments)
-      draw_table_row(combined, options, :heading)
-      render_table(rest, widths, options)
-    else
-      draw_table_row(combined, options)
-      render_table([second | rest], widths, options)
-    end
-  end
-
-  defp render_table([first | rest], widths, options) do
-    combined = Enum.zip(first, widths)
-    draw_table_row(combined, options)
-    render_table(rest, widths, options)
-  end
-
-  defp render_table([], _, _), do: nil
-
-  defp column_alignment({line, _}) do
-    cond do
-      String.starts_with?(line, ":") and String.ends_with?(line, ":") -> :center
-      String.ends_with?(line, ":") -> :right
-      true -> :left
-    end
-  end
-
-  defp table_header?(line) do
-    Enum.all?(line, fn {col, _} -> table_header_column?(col) end)
-  end
-
-  defp table_header_column?(":" <> rest), do: table_header_contents?(rest)
-  defp table_header_column?(col), do: table_header_contents?(col)
-
-  defp table_header_contents?("-" <> rest), do: table_header_contents?(rest)
-  defp table_header_contents?(":"), do: true
-  defp table_header_contents?(""), do: true
-  defp table_header_contents?(_), do: false
-
-  defp draw_table_row(cols_and_widths, options, heading \\ false) do
-    default_alignments = List.duplicate(:left, length(cols_and_widths))
-    alignments = Keyword.get(options, :alignments, default_alignments)
-
-    columns =
-      cols_and_widths
-      |> Enum.zip(alignments)
-      |> Enum.map_join(" | ", &generate_table_cell/1)
-
-    if heading do
-      write(:doc_table_heading, columns, options)
-    else
-      IO.puts(columns)
-    end
-  end
-
-  defp generate_table_cell({{{col, length}, width}, :center}) do
-    ansi_diff = byte_size(col) - length
-    width = width + ansi_diff
-
-    col
-    |> String.pad_leading(div(width, 2) - div(length, 2) + length)
-    |> String.pad_trailing(width + 1 - rem(width, 2))
-  end
-
-  defp generate_table_cell({{{col, length}, width}, :right}) do
-    ansi_diff = byte_size(col) - length
-    String.pad_leading(col, width + ansi_diff)
-  end
-
-  defp generate_table_cell({{{col, length}, width}, :left}) do
-    ansi_diff = byte_size(col) - length
-    String.pad_trailing(col, width + ansi_diff)
-  end
-
-  defp table_line?(line) do
-    line =~ ~r/[:\ -]\|[:\ -]/
-  end
-
-  ## Helpers
-
-  defp link_label?("[" <> rest, count) when count <= 3, do: link_label?(rest)
-  defp link_label?(_, _), do: false
-
-  defp link_label?("]: " <> _), do: true
-  defp link_label?("]" <> _), do: false
-  defp link_label?(""), do: false
-  defp link_label?(<<_>> <> rest), do: link_label?(rest)
-
-  defp strip_spaces(" " <> line, acc, max) when acc < max, do: strip_spaces(line, acc + 1, max)
-  defp strip_spaces(rest, acc, _max), do: {rest, acc}
-
-  defp write(style, string, options) do
-    IO.puts([color(style, options), string, maybe_reset(options)])
-  end
-
-  defp write_with_wrap([], _available, _indent, _first, _prefix) do
-    :ok
-  end
-
-  defp write_with_wrap(words, available, indent, first, prefix) do
-    words
-    |> wrap_text(available, indent, first, prefix, [])
-    |> tl()
-    |> IO.puts()
-  end
-
-  defp wrap_text([], _available, _indent, _first, _prefix, wrapped_lines) do
-    Enum.reverse(wrapped_lines)
-  end
-
-  defp wrap_text(words, available, indent, first, prefix, wrapped_lines) do
-    prefix_length = length_without_escape(prefix, 0)
-    {words, rest} = take_words(words, available - prefix_length, [])
-    line = [if(first, do: "", else: indent), prefix, Enum.join(words, " ")]
-
-    wrap_text(rest, available, indent, false, prefix, [line, ?\n | wrapped_lines])
-  end
-
-  defp take_words([word | words], available, acc) do
-    available = available - length_without_escape(word, 0)
-
-    cond do
-      # It fits, take one for space and continue decreasing
-      available > 0 ->
-        take_words(words, available - 1, [word | acc])
-
-      # No space but we got no words
-      acc == [] ->
-        {[word], words}
-
-      # Otherwise
-      true ->
-        {Enum.reverse(acc), [word | words]}
-    end
-  end
-
-  defp take_words([], _available, acc) do
-    {Enum.reverse(acc), []}
-  end
-
-  defp length_without_escape(<<?\e, ?[, _, _, ?m>> <> rest, count) do
-    length_without_escape(rest, count)
-  end
-
-  defp length_without_escape(<<?\e, ?[, _, ?m>> <> rest, count) do
-    length_without_escape(rest, count)
-  end
-
-  defp length_without_escape(rest, count) do
-    case String.next_grapheme(rest) do
-      {_, rest} -> length_without_escape(rest, count + 1)
-      nil -> count
-    end
-  end
-
-  defp handle_links(text) do
-    text
-    |> remove_square_brackets_in_link
-    |> escape_underlines_in_link
-  end
-
-  defp escape_underlines_in_link(text) do
-    # Regular expression adapted from https://tools.ietf.org/html/rfc3986#appendix-B
-    Regex.replace(~r{[a-z][a-z0-9\+\-\.]*://\S*}i, text, &String.replace(&1, "_", "\\_"))
-  end
-
-  defp remove_square_brackets_in_link(text) do
-    Regex.replace(~r{\[([^\]]*?)\]\((.*?)\)}, text, "\\1 (\\2)")
-  end
-
-  # We have four entries: **, __, *, _ and `.
-  #
-  # The first four behave the same while the last one is simpler
-  # when it comes to delimiters as it ignores spaces and escape
-  # characters. But, since the first two has two characters,
-  # we need to handle 3 cases:
-  #
-  # 1. __ and **
-  # 2. _ and *
-  # 3. `
-  #
-  # Where the first two should have the same code but match differently.
-  @single [?_, ?*]
-
-  # Characters that can mark the beginning or the end of a word.
-  # Only support the most common ones at this moment.
-  @delimiters [?\s, ?', ?", ?!, ?@, ?#, ?$, ?%, ?^, ?&] ++
-                [?-, ?+, ?(, ?), ?[, ?], ?{, ?}, ?<, ?>, ?.]
-
-  ### Inline start
-
-  defp handle_inline(<<mark, mark, rest::binary>>, options) when mark in @single do
-    handle_inline(rest, [mark | mark], [<<mark, mark>>], [], options)
-  end
-
-  defp handle_inline(<<mark, rest::binary>>, options) when mark in @single do
-    handle_inline(rest, mark, [<<mark>>], [], options)
-  end
-
-  defp handle_inline(rest, options) do
-    handle_inline(rest, nil, [], [], options)
-  end
-
-  ### Inline delimiters
-
-  defp handle_inline(<<delimiter, mark, mark, rest::binary>>, nil, buffer, acc, options)
-       when rest != "" and delimiter in @delimiters and mark in @single do
-    acc = [delimiter, Enum.reverse(buffer) | acc]
-    handle_inline(rest, [mark | mark], [<<mark, mark>>], acc, options)
-  end
-
-  defp handle_inline(<<delimiter, mark, rest::binary>>, nil, buffer, acc, options)
-       when rest != "" and delimiter in @delimiters and mark in @single do
-    handle_inline(rest, mark, [<<mark>>], [delimiter, Enum.reverse(buffer) | acc], options)
-  end
-
-  defp handle_inline(<<?`, rest::binary>>, nil, buffer, acc, options)
-       when rest != "" do
-    handle_inline(rest, ?`, ["`"], [Enum.reverse(buffer) | acc], options)
-  end
-
-  ### Clauses for handling escape
-
-  defp handle_inline(<<?\\, ?\\, mark, mark, rest::binary>>, nil, buffer, acc, options)
-       when rest != "" and mark in @single do
-    acc = [?\\, Enum.reverse(buffer) | acc]
-    handle_inline(rest, [mark | mark], [<<mark, mark>>], acc, options)
-  end
-
-  defp handle_inline(<<?\\, ?\\, mark, rest::binary>>, nil, buffer, acc, options)
-       when rest != "" and mark in @single do
-    handle_inline(rest, mark, [<<mark>>], [?\\, Enum.reverse(buffer) | acc], options)
-  end
-
-  defp handle_inline(<<?\\, ?\\, rest::binary>>, limit, buffer, acc, options) do
-    handle_inline(rest, limit, [?\\ | buffer], acc, options)
-  end
-
-  # An escape is not valid inside `
-  defp handle_inline(<<?\\, mark, rest::binary>>, limit, buffer, acc, options) when limit != ?` do
-    handle_inline(rest, limit, [mark | buffer], acc, options)
-  end
-
-  ### Inline end
-
-  defp handle_inline(<<mark, mark, delimiter, rest::binary>>, [mark | mark], buffer, acc, options)
-       when delimiter in @delimiters and mark in @single do
-    inline_buffer = inline_buffer(buffer, options)
-    handle_inline(<<delimiter, rest::binary>>, nil, [], [inline_buffer | acc], options)
-  end
-
-  defp handle_inline(<<mark, delimiter, rest::binary>>, mark, buffer, acc, options)
-       when delimiter in @delimiters and mark in @single do
-    inline_buffer = inline_buffer(buffer, options)
-    handle_inline(<<delimiter, rest::binary>>, nil, [], [inline_buffer | acc], options)
-  end
-
-  defp handle_inline(<<mark, mark, rest::binary>>, [mark | mark], buffer, acc, options)
-       when rest == "" and mark in @single do
-    handle_inline(<<>>, nil, [], [inline_buffer(buffer, options) | acc], options)
-  end
-
-  defp handle_inline(<<mark, rest::binary>>, mark, buffer, acc, options)
-       when rest == "" and mark in @single do
-    handle_inline(<<>>, nil, [], [inline_buffer(buffer, options) | acc], options)
-  end
-
-  defp handle_inline(<<?`, rest::binary>>, ?`, buffer, acc, options) do
-    handle_inline(rest, nil, [], [inline_buffer(buffer, options) | acc], options)
-  end
-
-  ### Catch all
-
-  defp handle_inline(<<char, rest::binary>>, mark, buffer, acc, options) do
-    handle_inline(rest, mark, [char | buffer], acc, options)
-  end
-
-  defp handle_inline(<<>>, _mark, buffer, acc, _options) do
-    IO.iodata_to_binary(Enum.reverse([Enum.reverse(buffer) | acc]))
-  end
-
-  defp inline_buffer(buffer, options) do
-    [mark | t] = Enum.reverse(buffer)
-    inline_text(mark, t, options)
-  end
-
-  ## Helpers
-
-  defp quote_prefix(options), do: "#{color(:doc_quote, options)}> #{maybe_reset(options)}"
-
-  defp heading(text, n, options) do
-    [color(:doc_headings, options), String.duplicate("#", n), " ", text, maybe_reset(options)]
-  end
-
-  defp inline_text(mark, text, options) do
-    if options[:enabled] do
-      [[color_for(mark, options) | text] | IO.ANSI.reset()]
-    else
-      [[mark | text] | mark]
-    end
-  end
-
-  defp color_for(mark, colors) do
-    case mark do
-      "__" -> color(:doc_bold, colors)
-      "**" -> color(:doc_bold, colors)
-      "_" -> color(:doc_underline, colors)
-      "*" -> color(:doc_underline, colors)
-      "`" -> color(:doc_inline_code, colors)
-    end
-  end
-
-  defp bullet_text(options) do
-    if options[:enabled], do: @bullet_text_unicode, else: @bullet_text_ascii
-  end
-
-  defp color(style, colors) do
-    IO.ANSI.format_fragment(colors[style], colors[:enabled])
-  end
-
-  defp newline_after_block(options) do
-    IO.puts(maybe_reset(options))
-  end
-
-  defp maybe_reset(options) do
-    if options[:enabled], do: IO.ANSI.reset(), else: ""
-  end
-end
@@ -1,78 +0,0 @@
-defmodule IO.StreamError do
-  defexception [:reason, :message]
-
-  @impl true
-  def exception(opts) do
-    reason = opts[:reason]
-    formatted = IO.iodata_to_binary(:file.format_error(reason))
-    %IO.StreamError{message: "error during streaming: #{formatted}", reason: reason}
-  end
-end
-
-defmodule IO.Stream do
-  @moduledoc """
-  Defines an `IO.Stream` struct returned by `IO.stream/2` and `IO.binstream/2`.
-
-  The following fields are public:
-
-    * `device`        - the IO device
-    * `raw`           - a boolean indicating if bin functions should be used
-    * `line_or_bytes` - if reading should read lines or a given number of bytes
-
-  It is worth noting that an IO stream has side effects and every time you go
-  over the stream you may get different results.
-
-  """
-
-  defstruct device: nil, raw: true, line_or_bytes: :line
-
-  @type t :: %__MODULE__{}
-
-  @doc false
-  def __build__(device, raw, line_or_bytes) do
-    %IO.Stream{device: device, raw: raw, line_or_bytes: line_or_bytes}
-  end
-
-  defimpl Collectable do
-    def into(%{device: device, raw: raw} = stream) do
-      {:ok, into(stream, device, raw)}
-    end
-
-    defp into(stream, device, raw) do
-      fn
-        :ok, {:cont, x} ->
-          case raw do
-            true -> IO.binwrite(device, x)
-            false -> IO.write(device, x)
-          end
-
-        :ok, _ ->
-          stream
-      end
-    end
-  end
-
-  defimpl Enumerable do
-    def reduce(%{device: device, raw: raw, line_or_bytes: line_or_bytes}, acc, fun) do
-      next_fun =
-        case raw do
-          true -> &IO.each_binstream(&1, line_or_bytes)
-          false -> &IO.each_stream(&1, line_or_bytes)
-        end
-
-      Stream.resource(fn -> device end, next_fun, & &1).(acc, fun)
-    end
-
-    def count(_stream) do
-      {:error, __MODULE__}
-    end
-
-    def member?(_stream, _term) do
-      {:error, __MODULE__}
-    end
-
-    def slice(_stream) do
-      {:error, __MODULE__}
-    end
-  end
-end
--- a/Show More
+++ b/Show More