19 lines
509 B
JavaScript
19 lines
509 B
JavaScript
// 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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function F() {}
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var f = new F
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function foo(x) { return x instanceof F };
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%OptimizeFunctionOnNextCall(foo);
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assertFalse(foo(1));
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var proto = Object.getPrototypeOf(F);
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Object.setPrototypeOf(F, null);
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F[Symbol.hasInstance] = function(v) { return true };
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Object.setPrototypeOf(F, proto);
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assertTrue(foo(1));
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