You can search for identifiers within the package.
in-package search v0.2.0
module W : WORD
type elt = W.t
type t
val empty : t
val is_empty : t -> bool
val return : elt -> t
val append : t -> t -> t
val union : t -> t -> t
val inter : t -> t -> t
val diff : t -> t -> t
val merge : t list -> t
val of_list : elt list -> t
val to_iter : t -> elt Iter.t
val memoize : t -> t