// 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";vararray=[1,2,3];assertEquals(array,[].concat(array));assertEquals(array,array.concat([]));array[Symbol.isConcatSpreadable]=false;assertEquals([[1,2,3]],[].concat(array));assertEquals([[1,2,3]],array.concat([]));