michael@0: try {
michael@0:   new MyObject;
michael@0: } catch (e) {}
michael@0: 
michael@0: function MyObject() {
michael@0:   return;
michael@0:   return this;
michael@0: }
michael@0: 
michael@0: function Foo(x) {
michael@0:   if (x)
michael@0:     this.f = x;
michael@0: }
michael@0: var q = new Foo(false);
michael@0: for (a in q) { assertEq(true, false); }
michael@0: 
michael@0: function Bar(x, y) {
michael@0:   if (!x)
michael@0:     return;
michael@0:   this.f = y;
michael@0: }
michael@0: var q2 = new Bar(false, true);
michael@0: for (b in q2) { assertEq(true, false); }