clojure.lang.PersistentVector.TransientVector.PopTail C# (CSharp) Метод

            private Node PopTail(int level, Node node)
            {
                node = EnsureEditable(node);
                int subidx = ((_cnt - 2) >> level) & 0x01f;
                if (level > 5)
                {
                    Node newchild = PopTail(level - 5, (Node)node.Array[subidx]);
                    if (newchild == null && subidx == 0)
                        return null;
                    else
                    {
                        Node ret = node;
                        ret.Array[subidx] = newchild;
                        return ret;
                    }
                }
                else if (subidx == 0)
                    return null;
                else
                {
                    Node ret = node;
                    ret.Array[subidx] = null;
                    return ret;
                }
            }