unit okr8fr;

fn head(s: []u8) -> &u8 {
    return &s[0];
}

fn test() -> u8 {
    var a: [2]u8 = [1 as u8, 2 as u8];
    let r = head(a[..]);
    let v = r.^;
    a[0] = 7 as u8;
    return v;
}