You can search for identifiers within the package.
in-package search v0.2.0
val run : unit Lwt.t -> unit
val at_exit : (unit -> unit Lwt.t) -> unit
val at_enter : (unit -> unit Lwt.t) -> unit
val at_exit_iter : (unit -> unit) -> unit
val at_enter_iter : (unit -> unit) -> unit