Macro numvec 

macro_rules! numvec {
    ($($l:tt)*) => { ... };
}

Macro rule for generating number range into vec. The NumberRange<T> is made with default options, then parsed and collected into a Vec.

let mut rng: Vec<i64> = numvec!(1,3:2:6,-4:-2);
assert_eq!(rng, vec![1, 3, 5, -4, -3, -2]);