| Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 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)); |