michael@0: function deepForInLoop() {
michael@0:   // NB: the number of props set in C is arefully tuned to match 8 = 2.
michael@0:   function C(){this.p = 1, this.q = 2}
michael@0:   C.prototype = {p:1, q:2, r:3, s:4, t:5};
michael@0:   var o = new C;
michael@0:   var j = 0;
michael@0:   var a = [];
michael@0:   for (var i in o)
michael@0:     a[j++] = i;
michael@0:   return a.join("");
michael@0: }
michael@0: assertEq(deepForInLoop(), "pqrst");