// Copyright 2014 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.varargs=(function(a,b,c){returnarguments;})(1,2,3);args[Symbol.isConcatSpreadable]=true;assertEquals([1,2,3,1,2,3],[].concat(args,args));Object.defineProperty(args,"length",{value:6});assertEquals([1,2,3,void0,void0,void0],[].concat(args));