Do not escape \ in uppercase sigils, closes #8989

Author: josevalim

lib/elixir/src/elixir_interpolation.erl

@@ -60,8 +60,8 @@ extract([$#, ${ | Rest], Buffer, Output, Line, Column, Scope, true, Last) ->
       {error, {string, Line, Column, "missing interpolation terminator: \"}\"", []}}
   end;
 
-extract([$\\ | Rest], Buffer, Output, Line, Column, Scope, Interpol, Last) ->
-  extract_char(Rest, [$\\ | Buffer], Output, Line, Column + 1, Scope, Interpol, Last);
+extract([$\\ | Rest], Buffer, Output, Line, Column, Scope, true, Last) ->
+  extract_char(Rest, [$\\ | Buffer], Output, Line, Column + 1, Scope, true, Last);
 
 %% Catch all clause
 

lib/elixir/test/elixir/code_formatter/literals_test.exs

@@ -85,8 +85,8 @@ defmodule Code.Formatter.LiteralsTest do
     end
 
     test "without escapes" do
-      assert_same ~S[:foo]
-      assert_same ~S[:\\]
+      assert_same ~s[:foo]
+      assert_same ~s[:\\\\]
     end
 
     test "with escapes" do

lib/elixir/test/elixir/kernel/sigils_test.exs

@@ -29,6 +29,7 @@ defmodule Kernel.SigilsTest do
     assert ~S(f\no) == "f\\no"
     assert ~S(foo\)) == "foo)"
     assert ~S[foo\]] == "foo]"
+    assert ~S[foo\\]] == "foo\\]"
   end
 
   test "sigil S newline" do