Macro u512 

macro_rules! u512 {
    ($($body:tt)*) => { ... };
}

A macro to construct 512-bit U512 unsigned integer from literals.

Examples:

use fastnum::{u512, U512};

const N: U512 = u512!(100);
let x = u512!(1);
assert!(u512!(0).is_zero());
println!("{x}");