| // Copyright 2015 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 | |
| function assertAsync(b, s) { | |
| if (!b) { | |
| %AbortJS(" FAILED!") | |
| } | |
| } | |
| class P extends Promise { | |
| constructor() { | |
| super(...arguments) | |
| return new Proxy(this, { | |
| get: (_, key) => { | |
| return key == 'then' ? | |
| this.then.bind(this) : | |
| this.constructor.resolve(20) | |
| } | |
| }) | |
| } | |
| } | |
| let p = P.resolve(10) | |
| p.key.then(v => assertAsync(v === 20)); |