You can search for identifiers within the package.
in-package search v0.2.0
type +'a t
type ('a, 'b) result =
| Ok of 'a
| Error of 'b
val return : 'a -> 'a t
val fail : exn -> 'a t
val (>>?) : 'a t -> (('a, exn) result -> 'b t) -> 'b t