Statically check for assignments to const in harmony mode.

src/parser.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 633 matching lines @@
   Literal* GetLiteralNumber(double value);
 
   Handle<String> ParseIdentifier(bool* ok);
   Handle<String> ParseIdentifierOrStrictReservedWord(
       bool* is_strict_reserved, bool* ok);
   Handle<String> ParseIdentifierName(bool* ok);
   Handle<String> ParseIdentifierNameOrGetOrSet(bool* is_get,
                                                bool* is_set,
                                                bool* ok);
 
+  // Determine if the expression is a variable proxy and mark it as being used
+  // in an assignment or with a increment/decrement operator.
+  void MarkAsUsedAsLValue(Expression* expression);
+
   // Strict mode validation of LValue expressions
   void CheckStrictModeLValue(Expression* expression,
                              const char* error,
                              bool* ok);
 
   // Strict mode octal literal validation.
   void CheckOctalLiteral(int beg_pos, int end_pos, bool* ok);
 
   // For harmony block scoping mode: Check if the scope has conflicting var/let
   // declarations from different scopes. It covers for example
@@ skipping 117 matching lines @@
  private:
   static const int kTypeSlot = 0;
   static const int kElementsSlot = 1;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(CompileTimeValue);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_