`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
end`