| // Copyright 2016 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Flags: --allow-natives-syntax |
| |
| function F() {} |
| var f = new F |
| |
| function foo(x) { return x instanceof F }; |
| %PrepareFunctionForOptimization(foo); |
| %OptimizeFunctionOnNextCall(foo); |
| assertFalse(foo(1)); |
| |
| var proto = Object.getPrototypeOf(F); |
| Object.setPrototypeOf(F, null); |
| F[Symbol.hasInstance] = function(v) { return true }; |
| Object.setPrototypeOf(F, proto); |
| |
| assertTrue(foo(1)); |
