michael@0: // Basic for-of test with Proxy whose iterator method is a generator.
michael@0: 
michael@0: var arr = ['a', 'b', 'c', 'd'];
michael@0: var proxy = Proxy.create({
michael@0:     getPropertyDescriptor: function (name) {
michael@0:         if (name == 'iterator') {
michael@0:             return {
michael@0:                 configurable: false,
michael@0:                 enumerable: false,
michael@0:                 writeable: false,
michael@0:                 value:  function () {
michael@0:                     for (var i = 0; i < arr.length; i++)
michael@0:                         yield arr[i];
michael@0:                 }
michael@0:             };
michael@0:         }
michael@0: 
michael@0:         // Otherwise, inherit the property from arr.
michael@0:         for (var obj = arr; obj; obj = Object.getPrototypeOf(obj)) {
michael@0:             var desc = Object.getOwnPropertyDescriptor(obj, name);
michael@0:             if (desc)
michael@0:                 return desc;
michael@0:         }
michael@0:         return undefined;
michael@0:     }
michael@0: });
michael@0: 
michael@0: for (var i = 0; i < 2; i++)
michael@0:     assertEq([v for (v of proxy)].join(","), "a,b,c,d");