| // 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 |
| |
| let custom_then_called = false; |
| |
| function foo(p) { |
| custom_then_called = false; |
| p.finally(x => x); |
| return custom_then_called; |
| } |
| |
| class MyPromise extends Promise { |
| then(onFulfilled, onRejected) { |
| custom_then_called = true; |
| return super.then(onFulfilled, onRejected); |
| } |
| } |
| |
| const a = MyPromise.resolve(1); |
| |
| %PrepareFunctionForOptimization(foo); |
| assertTrue(foo(a)); |
| assertTrue(foo(a)); |
| %OptimizeFunctionOnNextCall(foo); |
| assertTrue(foo(a)); |