Out_buf.t_from_output
Make a bufferized output from a non bufferized output+close.
the buffer to use. It's owned by this channel as long as the channel exists.
inherit t
method private virtual output_underlying : bytes -> int -> int -> unit
Emit these private bytes, unbufferized
method private virtual close_underlying : unit -> unit
Close the underlying output. The bufferized output will flush and then call this.