Implement ES2015 labelled function declaration restrictions

src/parsing/parser-base.h

 // Copyright 2012 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.
 
 #ifndef V8_PARSING_PARSER_BASE_H
 #define V8_PARSING_PARSER_BASE_H
 
 #include "src/ast/scopes.h"
 #include "src/bailout-reason.h"
 #include "src/hashmap.h"
 #include "src/messages.h"
 #include "src/parsing/expression-classifier.h"
 #include "src/parsing/func-name-inferrer.h"
 #include "src/parsing/scanner.h"
 #include "src/parsing/token.h"
 
 namespace v8 {
 namespace internal {
 
 
 enum FunctionNameValidity {
   kFunctionNameIsStrictReserved,
   kSkipFunctionNameCheck,
   kFunctionNameValidityUnknown
 };
 
+enum AllowLabelledFunctionStatement {
+  kAllowLabelledFunctionStatement,
+  kDisallowLabelledFunctionStatement,
+};
 
 struct FormalParametersBase {
   explicit FormalParametersBase(Scope* scope) : scope(scope) {}
   Scope* scope;
   bool has_rest = false;
   bool is_simple = true;
   int materialized_literals_count = 0;
 };
 
 
@@ skipping 3082 matching lines @@
     has_seen_constructor_ = true;
     return;
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_BASE_H