sig
val msg : Logs.level -> 'a Logs.log
val app : 'a Logs.log
val err : 'a Logs.log
val warn : 'a Logs.log
val info : 'a Logs.log
val debug : 'a Logs.log
val kmsg :
(unit -> 'a) ->
Logs.level ->
('b, Format.formatter, unit, 'a) Pervasives.format4 ->
((?header:string -> ?tags:Logs.Tag.set -> 'b) -> 'a) -> 'a
val on_error :
?level:Logs.level ->
?header:string ->
?tags:Logs.Tag.set ->
pp:(Format.formatter -> 'b -> unit) ->
use:('b -> 'a) -> ('a, 'b) Result.result -> 'a
val on_error_msg :
?level:Logs.level ->
?header:string ->
?tags:Logs.Tag.set ->
use:(unit -> 'a) -> ('a, [ `Msg of string ]) Result.result -> 'a
end