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23
24description("This test makes sure we don't hang when setting cyclic prototype values: http://bugs.webkit.org/show_bug.cgi?id=6985")
25
26var o1 = { p1: 1 };
27var o2 = { p2: 2 };
28o2.__proto__ = o1;
29var o3 = { p3: 3 };
30o3.__proto__ = o2;
31
32// Try to create a cyclical prototype chain.
33shouldThrow("o1.__proto__ = o3;");
34
35// This changes behaviour, since __proto__ is an accessor on Object.prototype.
36o1.__proto__ = null;
37
38shouldBeFalse("({}).hasOwnProperty.call(o1, '__proto__')");
39o1.__proto__ = o3;
40shouldBeTrue("({}).hasOwnProperty.call(o1, '__proto__')");
41shouldBe("Object.getPrototypeOf(o1)", "null");
42