Server.Tval (>>=) : 'a t -> ('a -> 'b Lwt.t) -> 'b Lwt.tval listen : unit -> server Lwt.tval read : channel -> bytes -> int -> int -> int Lwt.tval write : channel -> bytes -> int -> int -> unit Lwt.tval destroy : channel -> unit Lwt.tval address_of : channel -> Xs_protocol.address Lwt.tval namespace_of : channel -> (module Namespace.IO) option