25 lines
455 B
JavaScript
25 lines
455 B
JavaScript
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// Copyright 2017 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 A = {}
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A[Symbol.hasInstance] = function(x) {
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%DeoptimizeFunction(foo);
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return 1;
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}
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var a = {}
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function foo(o) {
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return o instanceof A;
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}
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foo(a);
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foo(a);
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assertTrue(foo(a) !== 1);
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%OptimizeFunctionOnNextCall(foo);
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assertTrue(foo(a) !== 1);
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