#[inline]
fn mbit(x: usize) -> isize { if x == 0 { -1 } else { 0 } }

// "Better"
pub fn main() {
    for i in 0..16 {
        println!("{:?}", (mbit(i&8), mbit(i&4), mbit(i&2), mbit(i&1)));
    }
}