Added IsProperty() check to result in DefineOrRedefineAccessor - if no check ...

src/v8natives.js

 // Copyright 2006-2008 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 671 matching lines @@
       var value = props[key];
       var desc = ToPropertyDescriptor(value);
       key_values.push(desc);
     }
   }
   for (var i = 0; i < key_values.length; i += 2) {
     var key = key_values[i];
     var desc = key_values[i + 1];
     DefineOwnProperty(obj, key, desc, true);
   }
+  return obj;
 }
 
 
 %SetCode($Object, function(x) {
   if (%_IsConstructCall()) {
     if (x == null) return this;
     return ToObject(x);
   } else {
     if (x == null) return { };
     return ToObject(x);
@@ skipping 286 matching lines @@
 
 // ----------------------------------------------------------------------------
 
 function SetupFunction() {
   InstallFunctions($Function.prototype, DONT_ENUM, $Array(
     "toString", FunctionToString
   ));
 }
 
 SetupFunction();