OCaml library : Scanf

`sig
module Scanning :
sig
type in_channel
type scanbuf = Scanf.Scanning.in_channel
val stdin : Scanf.Scanning.in_channel
type file_name = string
val open_in : Scanf.Scanning.file_name -> Scanf.Scanning.in_channel
val open_in_bin : Scanf.Scanning.file_name -> Scanf.Scanning.in_channel
val close_in : Scanf.Scanning.in_channel -> unit
val from_file : Scanf.Scanning.file_name -> Scanf.Scanning.in_channel
val from_file_bin : string -> Scanf.Scanning.in_channel
val from_string : string -> Scanf.Scanning.in_channel
val from_function : (unit -> char) -> Scanf.Scanning.in_channel
val from_channel : Stdlib.in_channel -> Scanf.Scanning.in_channel
val end_of_input : Scanf.Scanning.in_channel -> bool
val beginning_of_input : Scanf.Scanning.in_channel -> bool
val name_of_input : Scanf.Scanning.in_channel -> string
val stdib : Scanf.Scanning.in_channel
end
type ('a, 'b, 'c, 'd) scanner =
('a, Scanf.Scanning.in_channel, 'b, 'c, 'a -> 'd, 'd) Stdlib.format6 ->
'c
exception Scan_failure of string
val bscanf : Scanf.Scanning.in_channel -> ('a, 'b, 'c, 'd) Scanf.scanner
val sscanf : string -> ('a, 'b, 'c, 'd) Scanf.scanner
val scanf : ('a, 'b, 'c, 'd) Scanf.scanner
val kscanf :
Scanf.Scanning.in_channel ->
(Scanf.Scanning.in_channel -> exn -> 'd) ->
('a, 'b, 'c, 'd) Scanf.scanner
val ksscanf :
string ->
(Scanf.Scanning.in_channel -> exn -> 'd) ->
('a, 'b, 'c, 'd) Scanf.scanner
val bscanf_format :
Scanf.Scanning.in_channel ->
('a, 'b, 'c, 'd, 'e, 'f) Stdlib.format6 ->
(('a, 'b, 'c, 'd, 'e, 'f) Stdlib.format6 -> 'g) -> 'g
val sscanf_format :
string ->
('a, 'b, 'c, 'd, 'e, 'f) Stdlib.format6 ->
(('a, 'b, 'c, 'd, 'e, 'f) Stdlib.format6 -> 'g) -> 'g
val format_from_string :
string ->
('a, 'b, 'c, 'd, 'e, 'f) Stdlib.format6 ->
('a, 'b, 'c, 'd, 'e, 'f) Stdlib.format6
val unescaped : string -> string
val fscanf : Stdlib.in_channel -> ('a, 'b, 'c, 'd) Scanf.scanner
val kfscanf :
Stdlib.in_channel ->
(Scanf.Scanning.in_channel -> exn -> 'd) ->
('a, 'b, 'c, 'd) Scanf.scanner
end`