michael@0: var o = {
michael@0:     valueOf: function() {}
michael@0: };
michael@0: var threw = false;
michael@0: function test(t) {
michael@0:     try {
michael@0:         for (x[t++] in o) {}
michael@0:     } catch (err) {
michael@0: 	assertEq(t, 3.14);
michael@0: 	threw = true;
michael@0:     }
michael@0: }
michael@0: test(3.14);
michael@0: assertEq(threw, true);