michael@0: // for-of can iterate over generator-iterators produced by generator-expressions.
michael@0: 
michael@0: function g() {
michael@0:     yield 1;
michael@0:     yield 2;
michael@0: }
michael@0: 
michael@0: var it = g();
michael@0: for (var i = 0; i < 10; i++) {
michael@0:     let prev = it;
michael@0:     it = (k + 1 for (k of prev));
michael@0: }
michael@0: 
michael@0: var arr = [v for (v of it)];
michael@0: assertEq(arr.join(), "11,12");