Caml_ioval stdin : 'a Caml_undefined_extern.tval stdout : out_channelval stderr : out_channelval caml_ml_flush : out_channel -> unitval caml_ml_output : out_channel -> string -> int -> int -> unitval caml_ml_output_char : out_channel -> char -> unitval caml_ml_out_channels_list : unit -> out_channel list