You can search for identifiers within the package.
in-package search v0.2.0
module IO : IO.S
module IO : sig ... end
val read : IO.ic -> t option IO.t
val has_body : t -> bool
val read_body_chunk : t -> IO.ic -> Transfer.chunk IO.t
val write_header : t -> IO.oc -> unit IO.t
val write_body : t -> IO.oc -> string -> unit IO.t
val write_footer : t -> IO.oc -> unit IO.t
val write : (t -> IO.oc -> unit IO.t) -> t -> IO.oc -> unit IO.t
val is_form : t -> bool
val read_form : t -> IO.ic -> (string * string list) list IO.t