harmony-scoping: make assignment to 'const' a late error.

src/scopes.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/scopes.h"
 
 #include "src/accessors.h"
 #include "src/bootstrapper.h"
@@ skipping 1075 matching lines @@
 
     case DYNAMIC_LOOKUP:
       // The variable could not be resolved statically.
       var = NonLocal(proxy->raw_name(), DYNAMIC);
       break;
   }
 
   DCHECK(var != NULL);
   if (proxy->is_assigned()) var->set_maybe_assigned();
 
-  if (FLAG_harmony_scoping && strict_mode() == STRICT &&
-      var->is_const_mode() && proxy->is_assigned()) {
-    // Assignment to const. Throw a syntax error.
-    MessageLocation location(
-        info->script(), proxy->position(), proxy->position());
-    Isolate* isolate = info->isolate();
-    Factory* factory = isolate->factory();
-    Handle<JSArray> array = factory->NewJSArray(0);
-    Handle<Object> error;
-    MaybeHandle<Object> maybe_error =
-        factory->NewSyntaxError("harmony_const_assign", array);
-    if (maybe_error.ToHandle(&error)) isolate->Throw(*error, &location);
-    return false;
-  }
-
   if (FLAG_harmony_modules) {
     bool ok;
 #ifdef DEBUG
     if (FLAG_print_interface_details) {
       PrintF("# Resolve %.*s:\n", var->raw_name()->length(),
              var->raw_name()->raw_data());
     }
 #endif
     proxy->interface()->Unify(var->interface(), zone(), &ok);
     if (!ok) {
@@ skipping 311 matching lines @@
 }
 
 
 int Scope::ContextLocalCount() const {
   if (num_heap_slots() == 0) return 0;
   return num_heap_slots() - Context::MIN_CONTEXT_SLOTS -
       (function_ != NULL && function_->proxy()->var()->IsContextSlot() ? 1 : 0);
 }
 
 } }  // namespace v8::internal