| description("This test makes sure we don't hang when setting cyclic prototype values: http://bugs.webkit.org/show_bug.cgi?id=6985") | |
| var o1 = { p1: 1 }; | |
| var o2 = { p2: 2 }; | |
| o2.__proto__ = o1; | |
| var o3 = { p3: 3 }; | |
| o3.__proto__ = o2; | |
| // Try to create a cyclical prototype chain. | |
| shouldThrow("o1.__proto__ = o3;"); | |
| // This changes behaviour, since __proto__ is an accessor on Object.prototype. | |
| o1.__proto__ = null; | |
| shouldBeFalse("({}).hasOwnProperty.call(o1, '__proto__')"); | |
| o1.__proto__ = o3; | |
| shouldBeTrue("({}).hasOwnProperty.call(o1, '__proto__')"); | |
| shouldBe("Object.getPrototypeOf(o1)", "null"); |