docs: def p_operation_list(p):
      """
      operation_list : define_operation operation_list
                     | define_operation
      """
      if len(p) == 3:
          p[0] = p[1] + p[2]
      elif len(p) == 2:
          p[0] = p[1]
      else:
          raise RuntimeError("Invalid production rules 'p_operation_list'")