A very simple feature: Rust now has 128 bit integers!

# #![allow(unused_variables)]
#fn main() {
let x: i128 = 0;
let y: u128 = 0;
#}

These are twice the size of u64, and so can hold more values. More specifically,

• u128: 0 - 340,282,366,920,938,463,463,374,607,431,768,211,455
• i128: −170,141,183,460,469,231,731,687,303,715,884,105,728 - 170,141,183,460,469,231,731,687,303,715,884,105,727

Whew!