val fprintf : out_channel -> ('r, out_channel, unit) format -> 'r
val printf : ('r, out_channel, unit) format -> 'r
val eprintf : ('r, out_channel, unit) format -> 'r
val ifprintf : 'a -> ('r, 'a, unit) format -> 'r
val sprintf : ('r, unit, string) format -> 'r
val bprintf : Buffer.t -> ('r, Buffer.t, unit) format -> 'r
val kfprintf : (out_channel -> 'a) ->
out_channel -> ('r, out_channel, unit, 'a) format4 -> 'r
val ksprintf : (string -> 'a) -> ('r, unit, string, 'a) format4 -> 'r
val kbprintf : (Buffer.t -> 'a) -> Buffer.t -> ('r, Buffer.t, unit, 'a) format4 -> 'r
Formatting error and exit functions
val failwithf : ('r, unit, string, unit -> 'a) format4 -> 'r
raises Failure
val invalid_argf : ('r, unit, string, unit -> 'a) format4 -> 'r
raises Invalid_arg
val exitf : ('r, unit, string, unit -> 'a) format4 -> 'r
print to stderr; exit 1