You can search for identifiers within the package.
in-package search v0.2.0
type (!'ok0, !'err0) t = ('ok, 'err) result
module Core : sig ... end
val bind : ('a, 'b) t -> ('a -> ('c, 'b) t) -> ('c, 'b) t
val return : 'a -> ('a, 'b) t
module Infix : sig ... end