fn main() {
    let x = [
        [1, 2, 3, 4],
        [5, 6, 7, 8],
        [9, 10, 11, 12],
        [13, 14, 15, 16]
    ];

    eggs(x);
}

fn eggs<T: AsRef<[impl AsRef<[usize]>]>>(x: T) {
    println!("{}", x.as_ref()[2].as_ref()[2]);
}