method_missing

# File lib/drb/drb.rb, line 1131
    def method_missing(msg_id, *a, &b)
      if DRb.here?(@uri)
        obj = DRb.to_obj(@ref)
        DRb.current_server.check_insecure_method(obj, msg_id)
        return obj.__send__(msg_id, *a, &b)
      end

      succ, result = self.class.with_friend(@uri) do
        DRbConn.open(@uri) do |conn|
          conn.send_message(self, msg_id, a, b)
        end
      end

      if succ
        return result
      elsif DRbUnknown === result
        raise result
      else
        bt = self.class.prepare_backtrace(@uri, result)
        result.set_backtrace(bt + caller)
        raise result
      end
    end