code: def p_retry_option_list(p):
      
      if len(p) == 4:
          p[0] = merge_map(p[1], p[3])
      elif len(p) == 2:
          p[0] = p[1]
      else:
          raise RuntimeError("Invalid production in 'retry_option_list'")
docs: retry_option_list : retry_option COMMA retry_option_list
                        | retry_option