31a3cfbc10
BUG=v8:8801 Change-Id: I9d9d9824c6c9ad0176bbfd3723da1b578b17c256 Reviewed-on: https://chromium-review.googlesource.com/c/1495555 Commit-Queue: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Mythri Alle <mythria@chromium.org> Cr-Commit-Position: refs/heads/master@{#60001}
32 lines
608 B
JavaScript
32 lines
608 B
JavaScript
// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax
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class Foo extends Promise {};
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function f() {
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return new Promise(r => 88).then(x => 88);
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}
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%PrepareFunctionForOptimization(f);
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let y;
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y = f();
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assertFalse(y instanceof Foo);
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y = f();
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assertFalse(y instanceof Foo);
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%OptimizeFunctionOnNextCall(f);
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y = f();
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assertFalse(y instanceof Foo);
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assertTrue(Reflect.defineProperty(Promise, Symbol.species, {value: Foo}));
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y = f();
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assertInstanceof(y, Foo);
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