You can search for identifiers within the package.
in-package search v0.2.0
type 'a box
type ('a, 'b) resultb = ('a, 'b) Result.result box
type rpcfn = Rpc.call -> Rpc.response Lwt.t
val lift : ('a -> 'b Lwt.t) -> 'a -> 'b box
val bind : 'a box -> ('a -> 'b Lwt.t) -> 'b box
val return : 'a -> 'a box
val get : 'a box -> 'a Lwt.t
val (!@) : 'a box -> 'a Lwt.t
val put : 'a Lwt.t -> 'a box
val (~@) : 'a Lwt.t -> 'a box