You can search for identifiers within the package.
in-package search v0.2.0
include OBMonad.Kernel2 with type ('a, 'b) t := ('a, 'b) t
val bind : ('a, 'b) t -> ('a -> ('c, 'b) t) -> ('c, 'b) t
val return : 'a -> ('a, _) t