Preparsing inner funcs: declare arguments for preparsed scopes

src/parsing/preparser.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <cmath>
 
 #include "src/allocation.h"
 #include "src/base/logging.h"
 #include "src/conversions-inl.h"
 #include "src/conversions.h"
@@ skipping 113 matching lines @@
     // separately by Parser::SkipLazyFunctionBody.
     ParseFormalParameterList(&formals, CHECK_OK_VALUE(kPreParseSuccess));
     Expect(Token::RPAREN, CHECK_OK_VALUE(kPreParseSuccess));
     int formals_end_position = scanner()->location().end_pos;
 
     CheckArityRestrictions(
         formals.arity, kind, formals.has_rest, function_scope->start_position(),
         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;
 
   if (result == kLazyParsingAborted) {
     return kPreParseAbort;
   } else if (stack_overflow()) {
     return kPreParseStackOverflow;
   } else if (!*ok) {
     DCHECK(pending_error_handler_->has_pending_error());
   } else {
@@ skipping 165 matching lines @@
     }
   }
 }
 
 #undef CHECK_OK
 #undef CHECK_OK_CUSTOM
 
 
 }  // namespace internal
 }  // namespace v8