30 lines
571 B
JavaScript
30 lines
571 B
JavaScript
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// 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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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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