functor (L : Level_sig) ->
functor (S : Config) ->
sig
val level : L.t Pervasives.ref
val output : S.t BatIO.output Pervasives.ref
val log : ?fp:string -> L.t -> string -> unit
val logf :
?fp:string ->
L.t -> ('a, S.t BatIO.output, unit) Pervasives.format -> 'a
end