Caml_io
val stdin : 'a Caml_undefined_extern.t
val stdout : out_channel
val stderr : out_channel
val caml_ml_flush : out_channel -> unit
val caml_ml_output : out_channel -> string -> int -> int -> unit
val caml_ml_output_char : out_channel -> char -> unit
val caml_ml_out_channels_list : unit -> out_channel list