| // Copyright 2015 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. | |
| function Bar() { } | |
| function Baz() { } | |
| Baz.prototype = { __proto__: new Bar() } | |
| var x = new Baz(); | |
| function foo(y) { return y instanceof Bar; } | |
| assertTrue(foo(x)); | |
| Baz.prototype.__proto__ = null; | |
| assertFalse(foo(x)); |