You can search for identifiers within the package.
in-package search v0.2.0
rhythm.lib
Rhythm.OCamlListCore
type 'el t = 'el list
val make : unit -> 'a list
val length : 'a list -> int
val isEmpty : 'a list -> bool
val toList : 'el t -> 'el list
val fromList : 'el list -> 'el t
val getFirstExn : 'a list -> 'a
val addFirst : 'a -> 'a list -> 'a list
val removeFirstExn : 'a list -> 'a list