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