| // 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. |
| |
| var sentinel = {}; |
| Object.defineProperty(Promise, Symbol.species, { |
| value: function(f) { |
| f(function() {}, function() {}) |
| return sentinel; |
| } |
| }); |
| |
| // According to the WebAssembly JavaScript API spec, WebAssembly.instantiate is |
| // using the initial value of the Promise constructor. Specifically it ignores |
| // the Promise species constructor installed above. |
| var promise = WebAssembly.instantiate(new ArrayBuffer()); |
| assertInstanceof(promise, Promise); |
| assertNotSame(promise, sentinel); |
| |
| // All further uses of the returned Promise, like using Promise.prototype.then, |
| // will respect the Promise species constructor installed above however. |
| var monkey = promise.then(r => { print(r) }, e => { print(e) }); |
| assertSame(monkey, sentinel); |
