| // 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)); |