Disallow destructuring in legacy sloppy for-in loop parsing

src/parser.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_PARSER_H_
 #define V8_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/compiler.h"  // TODO(titzer): remove this include dependency
@@ skipping 1002 matching lines @@
       Expression* initializer;
     };
 
     DeclarationParsingResult()
         : declarations(4),
           first_initializer_loc(Scanner::Location::invalid()),
           bindings_loc(Scanner::Location::invalid()) {}
 
     Block* BuildInitializationBlock(ZoneList<const AstRawString*>* names,
                                     bool* ok);
-    const AstRawString* SingleName() const;
 
     DeclarationDescriptor descriptor;
     List<Declaration> declarations;
     Scanner::Location first_initializer_loc;
     Scanner::Location bindings_loc;
   };
 
   class PatternRewriter : private AstVisitor {
    public:
     static void DeclareAndInitializeVariables(
@@ skipping 361 matching lines @@
 
 DoExpression* ParserTraits::ParseDoExpression(bool* ok) {
   return parser_->ParseDoExpression(ok);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSER_H_