| // Copyright (c) 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. |
| |
| |
| /*--- |
| esid: sec-array.prototype.concat |
| es6id: 22.1.3.1_3 |
| description: Array.prototype.concat Symbol.isConcatSpreadable sparse object |
| includes: [compareArray.js] |
| features: [Symbol.isConcatSpreadable] |
| ---*/ |
| var obj = { length: 5 }; |
| obj[Symbol.isConcatSpreadable] = true; |
| assert(compareArray([void 0, void 0, void 0, void 0, void 0], [].concat(obj))); |
| |
| obj.length = 4000; |
| assert(compareArray(new Array(4000), [].concat(obj))); |
