`sig
type t = Stdlib.out_channel
type open_flag =
Stdlib.open_flag =
Open_rdonly
| Open_wronly
| Open_append
| Open_creat
| Open_trunc
| Open_excl
| Open_binary
| Open_text
| Open_nonblock
val stdout : Out_channel.t
val stderr : Out_channel.t
val open_bin : string -> Out_channel.t
val open_text : string -> Out_channel.t
val open_gen : Out_channel.open_flag list -> int -> string -> Out_channel.t
val with_open_bin : string -> (Out_channel.t -> 'a) -> 'a
val with_open_text : string -> (Out_channel.t -> 'a) -> 'a
val with_open_gen :
Out_channel.open_flag list ->
int -> string -> (Out_channel.t -> 'a) -> 'a
val close : Out_channel.t -> unit
val close_noerr : Out_channel.t -> unit
val output_char : Out_channel.t -> char -> unit
val output_byte : Out_channel.t -> int -> unit
val output_string : Out_channel.t -> string -> unit
val output_bytes : Out_channel.t -> bytes -> unit
val output : Out_channel.t -> bytes -> int -> int -> unit
val output_substring : Out_channel.t -> string -> int -> int -> unit
val flush : Out_channel.t -> unit
val flush_all : unit -> unit
val seek : Out_channel.t -> int64 -> unit
val pos : Out_channel.t -> int64
val length : Out_channel.t -> int64
val set_binary_mode : Out_channel.t -> bool -> unit
val set_buffered : Out_channel.t -> bool -> unit
val is_buffered : Out_channel.t -> bool
val isatty : Out_channel.t -> bool
end`