# File lib/parser/builders/default.rb, line 646
    def kwrestarg(dstar_t, name_t=nil)
      if name_t
        n(:kwrestarg, [ value(name_t).to_sym ],
          arg_prefix_map(dstar_t, name_t))
      else
        n0(:kwrestarg,
          arg_prefix_map(dstar_t))
      end
    end