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