Function u64 

pub fn u64() -> U64

Create a new u64 mutator.

Example

use mutatis::{mutators as m, Mutate, Session};

let mut mutator = m::u64();

let mut session = Session::new().shrink(true);

let mut value = 42;
session.mutate_with(&mut mutator, &mut value).unwrap();

assert!(value < 42);