Preparsing inner funcs: declare arguments for preparsed scopes

src/parsing/preparser.cc

Index: src/parsing/preparser.cc
diff --git a/src/parsing/preparser.cc b/src/parsing/preparser.cc
index d765876a88072b680c29af0050752a4292bb851d..cc7f9f52bdf4dc73528ff0683fca60d74cec8f3f 100644
--- a/src/parsing/preparser.cc
+++ b/src/parsing/preparser.cc
@@ -131,11 +131,19 @@ PreParser::PreParseResult PreParser::PreParseFunction(
         formals_end_position, CHECK_OK_VALUE(kPreParseSuccess));
     has_duplicate_parameters =
         !classifier()->is_valid_formal_parameter_list_without_duplicates();
+
+    if (track_unresolved_variables_) {
+      function_scope->DeclareVariableName(
+          ast_value_factory()->arguments_string(), VAR);
+      function_scope->DeclareVariableName(ast_value_factory()->this_string(),
+                                          VAR);
+    }
   }
 
   Expect(Token::LBRACE, CHECK_OK_VALUE(kPreParseSuccess));
   LazyParsingResult result = ParseStatementListAndLogFunction(
       &formals, has_duplicate_parameters, may_abort, ok);
+
   use_counts_ = nullptr;
   track_unresolved_variables_ = false;