| // Copyright 2018 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. |
| |
| // Flags: --allow-natives-syntax |
| |
| var obj = { length: 1, 0: "spread" }; |
| obj[Symbol.toStringTag] = "foo"; |
| obj[Symbol.hasInstance] = function() { return true; } |
| obj[Symbol.isConcatSpreadable] = true; |
| |
| var obj2 = { ...obj }; |
| |
| // Crash if fast result map bitfield is not set correctly, if verifying heap |
| %HeapObjectVerify(obj2); |
| |
| // Ensure correct result for some well-known symbols |
| assertEquals("[object foo]", Object.prototype.toString.call(obj2)); |
| assertTrue(Uint8Array instanceof obj2); |
| assertEquals(["spread"], [].concat(obj2)); |
