Macro vecu 

macro_rules! vecu {
    () => { ... };
    ($($x:expr),+ $(,)?) => { ... };
    ($($input:tt)*) => { ... };
}

Creates a Vec containing the arguments. vecu! unpacks iterable variables marked with @.

use vec_unpack::*;
let a = [2, 3];
let b = vecu![0, 1, @a, 4, 5];
assert_eq!(b, vec![0, 1, 2, 3, 4, 5]);