trait Trait {
    fn p(&self);
}

impl Trait for (u32) {
    fn p(&self) { print!("1"); }
}

impl Trait for (i32,) {
    fn p(&self) { print!("2"); }
}

impl Trait for (u32, u32) {
    fn p(&self) { print!("3"); }
}

impl Trait for (i32, i32,) {
    fn p(&self) { print!("4"); }
}

fn main() {
    (0).p();
    (0,).p();
    (0, 0).p();
    (0, 0,).p();
}