// Copyright (c) 2012 Ecma International. All rights reserved. // This code is governed by the BSD license found in the LICENSE file. /*--- es5id: 15.2.3.10-3-20 description: > Object.preventExtensions - named properties cannot be added into an Error object includes: [propertyHelper.js] ---*/ var obj = new Error(); assert(Object.isExtensible(obj)); Object.preventExtensions(obj); assert(!Object.isExtensible(obj)); verifyNotWritable(obj, "exName", "nocheck"); assert(!obj.hasOwnProperty("exName"));