| // Copyright (c) 2012 Ecma International. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-array.prototype.lastindexof |
| description: > |
| Array.prototype.lastIndexOf - deleting property of prototype |
| causes prototype index property not to be visited on an Array |
| ---*/ |
| |
| var arr = [0, , 2]; |
| |
| Object.defineProperty(arr, "20", { |
| get: function() { |
| delete Array.prototype[1]; |
| return 0; |
| }, |
| configurable: true |
| }); |
| |
| Array.prototype[1] = 1; |
| |
| assert.sameValue(arr.lastIndexOf(1), -1, 'arr.lastIndexOf(1)'); |
