Make sure struct expansion results in a remote dispatch (#4807)

Signed-off-by: José Valim <jose.valim@plataformatec.com.br>

lib/elixir/src/elixir_map.erl

@@ -19,7 +19,7 @@ expand_struct(Meta, Left, Right, #{context := Context} = E) ->
     true when is_atom(ELeft) ->
       %% We always record structs when they are expanded
       %% as they expect the reference at compile time.
-      elixir_lexical:record_remote(ELeft, nil, ?m(E, lexical_tracker));
+      elixir_lexical:record_remote(ELeft, '__struct__', 1, nil, ?line(Meta), ?m(E, lexical_tracker));
     true ->
       ok;
     false when Context == match ->

lib/elixir/test/elixir/kernel/lexical_tracker_test.exs

@@ -161,6 +161,7 @@ defmodule Kernel.LexicalTrackerTest do
           &R.func/0
           &Remote.func/0
           &Integer.is_even/1
+          %Macro.Env{}
         end
 
         &extract/2
@@ -171,6 +172,8 @@ defmodule Kernel.LexicalTrackerTest do
 
         &is_record/1; def b(a), do: is_record(a)
 
+        %Macro.Env{}
+
         Kernel.LexicalTracker.remote_dispatches(__ENV__.module)
       end |> elem(3)
       """)
@@ -181,14 +184,16 @@ defmodule Kernel.LexicalTrackerTest do
     assert {9, Integer, :is_even, 1} in compile_remote_calls
     assert {15, Record, :is_record, 1} in compile_remote_calls
     assert {18, Integer, :is_even, 1} in compile_remote_calls
-    assert {21, Record, :extract, 2} in compile_remote_calls
-    assert {22, Record, :is_record, 1} in compile_remote_calls
-    assert {23, Remote, :func, 0} in compile_remote_calls
+    assert {19, Macro.Env, :__struct__, 1} in compile_remote_calls
+    assert {22, Record, :extract, 2} in compile_remote_calls
+    assert {23, Record, :is_record, 1} in compile_remote_calls
     assert {24, Remote, :func, 0} in compile_remote_calls
-    assert {25, Integer, :is_even, 1} in compile_remote_calls
-    assert {27, Kernel, :def, 2} in compile_remote_calls
-    assert {27, Record, :is_record, 1} in compile_remote_calls
-    assert {29, Kernel.LexicalTracker, :remote_dispatches, 1} in compile_remote_calls
+    assert {25, Remote, :func, 0} in compile_remote_calls
+    assert {26, Integer, :is_even, 1} in compile_remote_calls
+    assert {28, Kernel, :def, 2} in compile_remote_calls
+    assert {28, Record, :is_record, 1} in compile_remote_calls
+    assert {30, Macro.Env, :__struct__, 1} in compile_remote_calls
+    assert {32, Kernel.LexicalTracker, :remote_dispatches, 1} in compile_remote_calls
 
     runtime_remote_calls = unroll_dispatches(runtime_remote_calls)
     assert {7, Record, :extract, 2} in runtime_remote_calls
@@ -200,7 +205,7 @@ defmodule Kernel.LexicalTrackerTest do
     assert {16, Remote, :func, 0} in runtime_remote_calls
     assert {17, Remote, :func, 0} in runtime_remote_calls
     assert {18, :erlang, :==, 2} in runtime_remote_calls
-    assert {27, :erlang, :is_tuple, 1} in runtime_remote_calls
+    assert {28, :erlang, :is_tuple, 1} in runtime_remote_calls
   end
 
   defp unroll_dispatches(dispatches) do