michael@0: // Replacing Array.prototype.iterator with a generator affects for-of behavior.
michael@0: 
michael@0: load(libdir + "iteration.js");
michael@0: 
michael@0: Array.prototype[std_iterator] = function* () {
michael@0:     for (var i = this.length; --i >= 0; )
michael@0:         yield this[i];
michael@0: };
michael@0: 
michael@0: var s = '';
michael@0: for (var v of ['a', 'b', 'c', 'd'])
michael@0:     s += v;
michael@0: assertEq(s, 'dcba');