Disallow generator declarations in certain locations

src/messages.h

 // Copyright 2006-2008 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.
 
 // The infrastructure used for (localized) message reporting in V8.
 //
 // Note: there's a big unresolved issue about ownership of the data
 // structures used by this framework.
 
 #ifndef V8_MESSAGES_H_
@@ skipping 346 matching lines @@
   T(DerivedConstructorReturn,                                                  \
     "Derived constructors may only return object or undefined")                \
   T(DuplicateConstructor, "A class may only have one constructor")             \
   T(DuplicateExport, "Duplicate export of '%'")                                \
   T(DuplicateProto,                                                            \
     "Duplicate __proto__ fields are not allowed in object literals")           \
   T(ForInOfLoopInitializer,                                                    \
     "% loop variable declaration may not have an initializer.")                \
   T(ForInOfLoopMultiBindings,                                                  \
     "Invalid left-hand side in % loop: Must have a single binding.")           \
+  T(GeneratorInLegacyContext,                                                  \
+    "Generator declarations are not allowed in legacy contexts.")              \
   T(IllegalBreak, "Illegal break statement")                                   \
   T(IllegalContinue, "Illegal continue statement")                             \
   T(IllegalLanguageModeDirective,                                              \
     "Illegal '%' directive in function with non-simple parameter list")        \
   T(IllegalReturn, "Illegal return statement")                                 \
   T(InvalidEscapedReservedWord, "Keyword must not contain escaped characters") \
   T(InvalidEscapedMetaProperty, "'%' must not contain escaped characters")     \
   T(InvalidLhsInAssignment, "Invalid left-hand side in assignment")            \
   T(InvalidCoverInitializedName, "Invalid shorthand property initializer")     \
   T(InvalidDestructuringTarget, "Invalid destructuring assignment target")     \
@@ skipping 136 matching lines @@
   static Handle<String> GetMessage(Isolate* isolate, Handle<Object> data);
   static base::SmartArrayPointer<char> GetLocalizedMessage(Isolate* isolate,
                                                            Handle<Object> data);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MESSAGES_H_