You can search for identifiers within the package.
in-package search v0.2.0
atd
Atd.Import
module List : sig ... end
module Option : sig ... end
val sprintf : ('a, unit, string) format -> 'a
val printf : ('a, out_channel, unit) format -> 'a
val eprintf : ('a, out_channel, unit) format -> 'a
val bprintf : Buffer.t -> ('a, Buffer.t, unit) format -> 'a
val fprintf : out_channel -> ('a, out_channel, unit) format -> 'a