Macro i512 

macro_rules! i512 {
    ($($body:tt)*) => { ... };
}

A macro to construct 512-bit I512 signed integer from literals.

Examples:

use fastnum::{i512, I512};

const N: I512 = i512!(100);
let x = i512!(1);
assert!(i512!(0).is_zero());
println!("{x}");