fn d<T>(_f: T) {
    match std::mem::size_of::<T>() {
        0 => print!("0"),
        1 => print!("1"),
        _ => print!("2"),
    }
}

fn a<T>(f: fn(T)) {
    d(f);
}

fn main() {
    a(a::<u8>);
    d(a::<u8>);
}