clojure.lang.PersistentTreeMap.NodeEnumerator.MoveNext C# (CSharp) Метод

            public bool MoveNext()
            {
                if (_stack.Count == 0)
                    throw new InvalidOperationException("Enumerator at end.");
                Node t = _stack.Pop();
                push(_asc ? t.Right : t.Left);
                return _stack.Count > 0;
            }