You can search for identifiers within the package.
in-package search v0.2.0
module Array : sig ... end
module Int = Base.Int
module Interface = Hardcaml.Interface
module List = Base.List
val concat : ?sep:Base.String.t -> Base.String.t list -> Base.String.t
val option_map2_exn : 'a option -> 'b option -> f:('a -> 'b -> 'c) -> 'c option
val option_iter2_exn : 'a option -> 'b option -> f:('a -> 'b -> unit) -> unit