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| 1 // Copyright 2016 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 // Flags: --allow-natives-syntax --harmony-instanceof |
| 6 |
| 7 function F() {} |
| 8 var f = new F |
| 9 |
| 10 var proto = Object.getPrototypeOf(F); |
| 11 Object.setPrototypeOf(F, null); |
| 12 F[Symbol.hasInstance] = function(v) { return true }; |
| 13 Object.setPrototypeOf(F, proto); |
| 14 |
| 15 function foo(x) { return x instanceof F }; |
| 16 %OptimizeFunctionOnNextCall(foo); |
| 17 assertTrue(foo(1)); |
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