michael@0: c = (0).__proto__
michael@0: function f(o) {
michael@0:     o.__proto__ = null
michael@0:     for (x in o) {}
michael@0: }
michael@0: for (i = 0; i < 9; i++) {
michael@0:     f(c)
michael@0:     Function.prototype.__proto__.__proto__ = c
michael@0:     for (x in Function.prototype.__proto__) {}
michael@0:     f(Math.__proto__)
michael@0: }