type 'a t = 'a Lwt.tval return : 'a -> 'a ttype ic = Lwt_io.input_channeltype oc = Lwt_io.output_channeltype conn = Conduit_lwt_unix.flowResponse.IOtype 'a t = 'a Lwt.tval return : 'a -> 'a ttype ic = Lwt_io.input_channeltype oc = Lwt_io.output_channeltype conn = Conduit_lwt_unix.flow