// 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."use strict";// If @@isConcatSpreadable is not used, the value of IsArray(O)// is used to determine the spreadable property.classAextendsArray{}varobj=[].concat(newA(1,2,3),newA(4,5,6),newA(7,8,9));assertEquals(9,obj.length);for(vari=0;i<obj.length;++i){assertEquals(i+1,obj[i]);}// TODO(caitp): when concat is called on instances of classes which extend// Array, they should://// - return an instance of the class, rather than an Array instance (if from// same Realm)// - always treat such classes as concat-spreadable