19 lines
579 B
JavaScript
19 lines
579 B
JavaScript
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// Copyright 2016 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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var Foo = {
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[Symbol.hasInstance]: Function.prototype[Symbol.hasInstance]
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};
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// TurboFan will optimize this to false via constant-folding the
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// OrdinaryHasInstance call inside Function.prototype[@@hasInstance].
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function foo() { return 1 instanceof Foo; }
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assertEquals(false, foo());
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assertEquals(false, foo());
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(false, foo());
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