Make sure --version flag halts elixir and iex, closes #11453

lib/elixir/lib/kernel/cli.ex

@@ -218,12 +218,16 @@ defmodule Kernel.CLI do
 
   # Parse shared options
 
-  defp parse_shared([opt | _], _config) when opt in @standalone_opts do
+  defp warn_standalone(opt) do
     IO.puts(:stderr, "#{opt} : Standalone options can't be combined with other options")
+  end
+
+  defp parse_shared([opt | _], _config) when opt in @standalone_opts do
+    warn_standalone(opt)
     System.halt(1)
   end
 
-  defp parse_shared([opt | t], config) when opt in ["-v", "--version"] do
+  defp parse_shared([opt | t], _config) when opt in ["-v", "--version"] do
     if function_exported?(IEx, :started?, 0) and IEx.started?() do
       IO.puts("IEx " <> System.build_info()[:build])
     else
@@ -231,7 +235,8 @@ defmodule Kernel.CLI do
       IO.puts("Elixir " <> System.build_info()[:build])
     end
 
-    parse_shared(t, config)
+    t != [] && warn_standalone(opt)
+    System.halt(1)
   end
 
   defp parse_shared(["-pa", h | t], config) do

lib/elixir/test/elixir/kernel/cli_test.exs

@@ -71,10 +71,14 @@ defmodule Kernel.CLITest do
     assert output =~ "Erlang/OTP #{System.otp_release()}"
     assert output =~ "Elixir #{System.version()}"
 
+    output = iex('--version')
+    assert output =~ "Erlang/OTP #{System.otp_release()}"
+    assert output =~ "IEx #{System.version()}"
+
     output = elixir('--version -e "IO.puts(:test_output)"')
     assert output =~ "Erlang/OTP #{System.otp_release()}"
     assert output =~ "Elixir #{System.version()}"
-    assert output =~ "test_output"
+    assert output =~ "Standalone options can't be combined with other options"
   end
 
   test "--short-version smoke test" do

lib/elixir/test/elixir/test_helper.exs

@@ -39,6 +39,14 @@ defmodule PathHelpers do
     executable_path("elixirc")
   end
 
+  def iex(args) do
+    run_cmd(iex_executable(), args)
+  end
+
+  def iex_executable do
+    executable_path("iex")
+  end
+
   def write_beam({:module, name, bin, _} = res) do
     File.mkdir_p!(unquote(path))
     beam_path = Path.join(unquote(path), Atom.to_string(name) <> ".beam")