OLD | NEW |
(Empty) | |
| 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 function foo(x) { return x instanceof F }; |
| 11 %OptimizeFunctionOnNextCall(foo); |
| 12 assertFalse(foo(1)); |
| 13 |
| 14 var proto = Object.getPrototypeOf(F); |
| 15 Object.setPrototypeOf(F, null); |
| 16 F[Symbol.hasInstance] = function(v) { return true }; |
| 17 Object.setPrototypeOf(F, proto); |
| 18 |
| 19 assertTrue(foo(1)); |
OLD | NEW |