Macro i448 

macro_rules! i448 {
    ($lit:expr) => { ... };
}

A macro to construct I448 (448-bit signed integer) from literals.

Examples:

use fastnum::{I448, i448};

const N: I448 = i448!(100);
let x = i448!(1);
assert!(i448!(0).is_zero());
println!("{x}");