You can search for identifiers within the package.
in-package search v0.2.0
module M : Map.S
type !'a map = 'a M.t
type key = M.key
val to_seq : 'a map -> (key * 'a) t
val keys : 'a map -> key t
val values : 'a map -> 'a t
val of_seq : (key * 'a) t -> 'a map