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586db2414a
PR-URL: https://github.com/nodejs/node/pull/21983 Reviewed-By: Refael Ackermann <refack@gmail.com> Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
34 lines
657 B
JavaScript
34 lines
657 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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function Foo() {}
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function f() {
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return [42].map(_ => 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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assertInstanceof(y, Array);
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y = f();
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assertFalse(y instanceof Foo);
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assertInstanceof(y, Array);
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%OptimizeFunctionOnNextCall(f);
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y = f();
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assertFalse(y instanceof Foo);
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assertInstanceof(y, Array);
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assertTrue(Reflect.defineProperty(Array, Symbol.species, {value: Foo}));
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y = f();
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assertInstanceof(y, Foo);
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assertFalse(y instanceof Array);
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