You can search for identifiers within the package.
in-package search v0.2.0
module Ord : OrderedType
module M : sig ... end
type key = M.key
type 'a t
val empty : unit -> 'a t
val create : 'a M.t -> 'a t
val union : 'a t -> 'a M.t -> 'a t
val get : 'a t -> 'a M.t