val unit_e : (t, 'a) Stdlib.result
val unit_es : (t, 'a) Stdlib.result Lwt.t
val equal : t -> t -> bool
val compare : t -> t -> int
val to_string : t -> string
val catch : ?catch_only:(exn -> bool) -> (unit -> unit) -> unit
val catch_f :
?catch_only:(exn -> bool) ->
(unit -> unit) ->
(exn -> unit) ->
unit
val catch_s : ?catch_only:(exn -> bool) -> (unit -> unit Lwt.t) -> unit Lwt.t