michael@0: // |jit-test| error: TypeError
michael@0: load(libdir + "iteration.js");
michael@0: 
michael@0: eval("var x; typeof x")
michael@0: Array.prototype[std_iterator] = function () { for(y in x); };
michael@0: for (var v of ['a', 'b', 'c', 'd'])
michael@0:     s = v;