{
                            return tb.current;
                        })(rb, sb);
                    }), Dispose: (function (sb) {
                        return (function (tb, sb) {
                            ;
                        })(rb, sb);
                    }), MoveNext: (function (sb) {
                        return (function (tb, sb) {
                            var ub = (function (vb) {
                                var wb = q(tb.acc);
                                var xb = tb.unfold