`sig
val fprintf :
Pervasives.out_channel -> ('a, Pervasives.out_channel, unit) format -> 'a
val printf : ('a, Pervasives.out_channel, unit) format -> 'a
val eprintf : ('a, Pervasives.out_channel, unit) format -> 'a
val sprintf : ('a, unit, string) format -> 'a
val bprintf : Buffer.t -> ('a, Buffer.t, unit) format -> 'a
val kprintf : (string -> string) -> ('a, unit, string) format -> 'a
val scan_format :
string ->
int ->
(string -> int -> 'a) ->
('b -> 'c -> int -> 'a) -> ('d -> int -> 'a) -> 'a
end`