unit io;
pub enum Writer { Stdout, Stderr, File(u16), Null }
pub enum Reader { Stdin, File(u16) }
pub fn write(w: Writer, bytes: []u8) -> !usize;
pub fn read(r: Reader, bytes: []mut u8) -> !usize;
pub struct File {
    handle: u16,
    pub fn close(self: Self) -> !void;
    pub fn drop(self: &mut Self) { }
}