Properly print warnings from tokenizer in EEx, closes #12926

Author: josevalim

lib/eex/lib/eex/compiler.ex

@@ -72,8 +72,8 @@ defmodule EEx.Compiler do
         {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)
+              Enum.each(Enum.reverse(warnings), fn {location, msg} ->
+                :elixir_errors.erl_warn(location, state.file, msg)
               end)
 
               token_key(tokens, expr)

lib/eex/test/eex/tokenizer_test.exs

@@ -5,7 +5,13 @@ defmodule EEx.TokenizerTest do
 
   @opts [indentation: 0, trim: false]
 
-  test "simple chars lists" do
+  test "tokenizer warning" do
+    assert ExUnit.CaptureIO.capture_io(:stderr, fn ->
+             EEx.tokenize(~c"foo <% :'bar' %>", @opts)
+           end) =~ "found quoted atom \"bar\" but the quotes are not required"
+  end
+
+  test "simple charlists" do
     assert EEx.tokenize(~c"foo", @opts) ==
              {:ok, [{:text, ~c"foo", %{column: 1, line: 1}}, {:eof, %{column: 4, line: 1}}]}
   end