You can search for identifiers within the package.
in-package search v0.2.0
module T : sig ... end
val port : string
module Private : sig ... end
val set_baud_rate : int -> unit Lwt.t
val read_line : unit -> string Lwt.t
val write_line : string -> unit Lwt.t
val wait_for_line : string -> unit Lwt.t
val io_loop : string option -> unit Lwt.t