Make.1-Io
val output_char : out_channel -> char -> unit Lwt.t
val output_string : out_channel -> string -> unit Lwt.t
val flush : out_channel -> unit Lwt.t
val input_char : in_channel -> char Lwt.t
val really_input : in_channel -> bytes -> int -> int -> unit Lwt.t
val close_in : in_channel -> unit Lwt.t
val open_connection : sockaddr -> (in_channel * out_channel) Lwt.t