michael@0: expected = "TypeError: a is not a function";
michael@0: actual = "";
michael@0: 
michael@0: try {
michael@0:     a = ""
michael@0:     for each(x in [0, 0, 0, 0]) {
michael@0:         a %= x
michael@0:     } ( let (a=-a) a)()
michael@0: } catch (e) {
michael@0:     actual = '' + e;
michael@0: }
michael@0: 
michael@0: assertEq(actual, expected);