sig
type t =
Not_watching
| Watch_once of Raw_fd.ready_to_result Import.Ivar.t
| Watch_repeatedly of Async_core.Job.t *
[ `Bad_fd | `Closed | `Interrupted ] Import.Ivar.t
| Stop_requested
val sexp_of_t : Raw_fd.Watching.t -> Sexplib.Sexp.t
val invariant : Raw_fd.Watching.t -> unit
end