michael@0: options('strict')
michael@0: f = (function() {
michael@0:   for (var z = 0; z < 9; ++z) {
michael@0:     x = z
michael@0:   }
michael@0:   try {
michael@0:     i
michael@0:   } catch (x if null) {
michael@0:     let e
michael@0:   } catch (l) {
michael@0:     x.m
michael@0:   }
michael@0: })
michael@0: for (a in f()) {}