You can search for identifiers within the package.
in-package search v0.2.0
type t
module V : Hashtbl.HashedType
val children : t -> V.t -> (V.t -> unit) -> unit
val rev_children : t -> V.t -> (V.t -> unit) -> unit
val rightmost_child : t -> V.t -> V.t option
val leftmost_child : t -> V.t -> V.t option
val is_parent : t -> parent:V.t -> child:V.t -> bool