Module Stdio

module In_channel : sig ... end
module Out_channel : sig ... end
val stdin : In_channel.t
val stdout : Out_channel.t
val stderr : Out_channel.t
val printf : ('a, Out_channel.t, Base.unit) Base.format -> 'a
val print_s : ?mach:Base.unit -> Base.Sexp.t -> Base.unit
val eprint_s : ?mach:Base.unit -> Base.Sexp.t -> Base.unit
val eprintf : ('a, Out_channel.t, Base.unit) Base.format -> 'a
val print_string : Base.string -> Base.unit
val print_endline : Base.string -> Base.unit
val prerr_endline : Base.string -> Base.unit