ES6: Remove __proto__ setter poison pill

src/v8natives.js

 // Copyright 2012 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 370 matching lines @@
   if (IS_UNDEFINED(desc)) return desc;
 
   if (IsDataDescriptor(desc)) {
     return { value: desc.getValue(),
              writable: desc.isWritable(),
              enumerable: desc.isEnumerable(),
              configurable: desc.isConfigurable() };
   }
   // Must be an AccessorDescriptor then. We never return a generic descriptor.
   return { get: desc.getGet(),
-           set: desc.getSet() === ObjectSetProto ? ObjectPoisonProto
-                                                 : desc.getSet(),
+           set: desc.getSet(),
            enumerable: desc.isEnumerable(),
            configurable: desc.isConfigurable() };
 }
 
 
 // Harmony Proxies
 function FromGenericPropertyDescriptor(desc) {
   if (IS_UNDEFINED(desc)) return desc;
   var obj = new $Object();
 
@@ skipping 952 matching lines @@
   return %GetPrototype(this);
 }
 
 
 // Harmony __proto__ setter.
 function ObjectSetProto(obj) {
   return %SetPrototype(this, obj);
 }
 
 
-// Harmony __proto__ poison pill.
-function ObjectPoisonProto(obj) {
-  throw MakeTypeError("proto_poison_pill", []);
-}
-
-
 function ObjectConstructor(x) {
   if (%_IsConstructCall()) {
     if (x == null) return this;
     return ToObject(x);
   } else {
     if (x == null) return { };
     return ToObject(x);
   }
 }
 
 
 // ----------------------------------------------------------------------------
 // Object
 
 function SetUpObject() {
   %CheckIsBootstrapping();
 
   %SetNativeFlag($Object);
   %SetCode($Object, ObjectConstructor);
-  %FunctionSetName(ObjectPoisonProto, "__proto__");
-  %FunctionRemovePrototype(ObjectPoisonProto);
   %SetExpectedNumberOfProperties($Object, 4);
 
   %SetProperty($Object.prototype, "constructor", $Object, DONT_ENUM);
 
   // Set up non-enumerable functions on the Object.prototype object.
   InstallFunctions($Object.prototype, DONT_ENUM, $Array(
     "toString", ObjectToString,
     "toLocaleString", ObjectToLocaleString,
     "valueOf", ObjectValueOf,
     "hasOwnProperty", ObjectHasOwnProperty,
@@ skipping 442 matching lines @@
 // Eventually, we should move to a real event queue that allows to maintain
 // relative ordering of different kinds of tasks.
 
 RunMicrotasks.runners = new InternalArray;
 
 function RunMicrotasks() {
   while (%SetMicrotaskPending(false)) {
     for (var i in RunMicrotasks.runners) RunMicrotasks.runners[i]();
   }
 }