docs: private void rightAdd(
                           GBSNode           p,
                           GBSNode           l,
                           Object            new1,
                           NodeInsertPoint   ip,
                           InsertNodes       point)
      {
          if (l == null)                 /* There is no upper successor           */
              rightAddNoSuccessor(p, new1, ip, point);
          else                           /* There is an upper successor           */
              rightAddWithSuccessor(p, l, new1, ip, point);
      }