Printf

`sig
val fprintf :
Pervasives.out_channel ->
('a, Pervasives.out_channel, unit) Pervasives.format -> 'a
val printf : ('a, Pervasives.out_channel, unit) Pervasives.format -> 'a
val eprintf : ('a, Pervasives.out_channel, unit) Pervasives.format -> 'a
val sprintf : ('a, unit, string) Pervasives.format -> 'a
val bprintf : Buffer.t -> ('a, Buffer.t, unit) Pervasives.format -> 'a
val kfprintf :
(Pervasives.out_channel -> 'a) ->
Pervasives.out_channel ->
('b, Pervasives.out_channel, unit, 'a) format4 -> 'b
val ksprintf : (string -> 'a) -> ('b, unit, string, 'a) format4 -> 'b
val kprintf : (string -> 'a) -> ('b, unit, string, 'a) format4 -> 'b
type index
external index_of_int : int -> Printf.index = "%identity"
val scan_format :
string ->
'a array ->
Printf.index ->
int ->
(Printf.index -> string -> int -> 'b) ->
(Printf.index -> 'c -> 'd -> int -> 'b) ->
(Printf.index -> 'e -> int -> 'b) ->
(Printf.index -> int -> 'b) ->
(Printf.index -> ('f, 'g, 'h, 'i) format4 -> int -> 'b) -> 'b
val sub_format :
(string -> int) ->
(string -> int -> char -> int) -> char -> string -> int -> int
val summarize_format_type : string -> string
val kapr : (string -> Obj.t array -> 'a) -> string -> 'a
end`