You can search for identifiers within the package.
in-package search v0.2.0
val const : 'a -> 'b -> 'a
val id : 'a -> 'a
val o : ('a -> 'b) -> ('c -> 'a) -> 'c -> 'b
module List_set : sig ... end
module Cs : sig ... end
val filter_map : f:('a -> 'b option) -> 'a list -> 'b list
val map_find : f:('a -> 'b option) -> 'a list -> 'b option
val option : 'a -> ('b -> 'a) -> 'b option -> 'a
val init_and_last : 'a list -> ('a list * 'a) option
val first_match : 'a list -> 'a list -> 'a option