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try { new MyObject; } catch (e) {} function MyObject() { return; return this; } function Foo(x) { if (x) this.f = x; } var q = new Foo(false); for (a in q) { assertEq(true, false); } function Bar(x, y) { if (!x) return; this.f = y; } var q2 = new Bar(false, true); for (b in q2) { assertEq(true, false); }