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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 |
| 6 |
| 7 var Foo = { |
| 8 [Symbol.hasInstance]: Function.prototype[Symbol.hasInstance] |
| 9 }; |
| 10 |
| 11 // TurboFan will optimize this to false via constant-folding the |
| 12 // OrdinaryHasInstance call inside Function.prototype[@@hasInstance]. |
| 13 function foo() { return 1 instanceof Foo; } |
| 14 |
| 15 assertEquals(false, foo()); |
| 16 assertEquals(false, foo()); |
| 17 %OptimizeFunctionOnNextCall(foo); |
| 18 assertEquals(false, foo()); |
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