Statically check for assignments to const in harmony mode.

src/ast.cc

 // 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 52 matching lines @@
   return AsLiteral() != NULL && AsLiteral()->handle()->IsNull();
 }
 
 
 VariableProxy::VariableProxy(Isolate* isolate, Variable* var)
     : Expression(isolate),
       name_(var->name()),
       var_(NULL),  // Will be set by the call to BindTo.
       is_this_(var->is_this()),
       is_trivial_(false),
+      is_lvalue_(false),
       position_(RelocInfo::kNoPosition) {
   BindTo(var);
 }
 
 
 VariableProxy::VariableProxy(Isolate* isolate,
                              Handle<String> name,
                              bool is_this,
                              int position)
     : Expression(isolate),
       name_(name),
       var_(NULL),
       is_this_(is_this),
       is_trivial_(false),
+      is_lvalue_(false),
       position_(position) {
   // Names must be canonicalized for fast equality checks.
   ASSERT(name->IsSymbol());
 }
 
 
 void VariableProxy::BindTo(Variable* var) {
   ASSERT(var_ == NULL);  // must be bound only once
   ASSERT(var != NULL);  // must bind
   ASSERT((is_this() && var->is_this()) || name_.is_identical_to(var->name()));
@@ skipping 1111 matching lines @@
                        int pos)
     : label_(label),
       statements_(statements),
       position_(pos),
       compare_type_(NONE),
       compare_id_(AstNode::GetNextId(isolate)),
       entry_id_(AstNode::GetNextId(isolate)) {
 }
 
 } }  // namespace v8::internal