You can search for identifiers within the package.
in-package search v0.2.0
hc
Hc.MakeStrong
module H : Hashtbl.HashedType
include sig ... end
type key = Hashtbl.Make(H).key
val clear : unit -> unit
val hashcons : key -> key hash_consed
val stats : unit -> Hashtbl.statistics
val length : unit -> int