type t =
  < active : int -> bool
  ; f : 'a. int -> ('a, unit, string, unit) format4 -> 'a
  ; critical : 'a. ('a, unit, string, unit) format4 -> 'a
  ; severe : 'a. ('a, unit, string, unit) format4 -> 'a
  ; important : 'a. ('a, unit, string, unit) format4 -> 'a
  ; info : 'a. ('a, unit, string, unit) format4 -> 'a
  ; debug : 'a. ('a, unit, string, unit) format4 -> 'a
  ; level : int option
  ; set_level : int -> unit >

val make : Dtools.Conf.path -> t
