You can search for identifiers within the package.
in-package search v0.2.0
type ('a, 'e) t = ('a, 'e) result IO.t
val return : 'a -> ('a, 'e) t
val bind : ('a, 'e) t -> ('a -> ('b, 'e) t) -> ('b, 'e) t
val (>>=) : ('a, 'e) t -> ('a -> ('b, 'e) t) -> ('b, 'e) t