Macro i64 

macro_rules! i64 {
    ($($body:tt)*) => { ... };
}

A macro to construct 64-bit I64 signed integer from literals.

Examples:

use fastnum::{i64, I64};

const N: I64 = i64!(100);
let x = i64!(1);
assert!(i64!(0).is_zero());
println!("{x}");