# File lib/redis/subscribe.rb, line 29
    def subscription(start, stop, channels, block)
      sub = Subscription.new(&block)

      begin
        @client.call_loop([start, *channels]) do |line|
          type, *rest = line
          sub.callbacks[type].call(*rest)
          break if type == stop && rest.last == 0
        end
      ensure
        send(stop)
      end
    end