trait CheckedDiver
where
    Self: Sized + std::fmt::Debug,
{
    fn checked_div(self, rhs: u128) -> Option<u128>;
}

fn run(foo: impl CheckedDiver) {
    dbg!(foo.checked_div(4).unwrap());
}

impl CheckedDiver for u128 {}

fn main() {
    run(20_u128);
}