You can search for identifiers within the package.
in-package search v0.2.0
type (!'ok, !'err) t = ('ok, 'err) Stdlib.result
module Core : sig ... end
val apply : ('a -> 'b, 'c) t -> ('a, 'c) t -> ('b, 'c) t
val map : ('a -> 'b) -> ('a, 'c) t -> ('b, 'c) t
val pure : 'a -> ('a, 'b) t
module Infix : sig ... end