Macro compact_vec 

macro_rules! compact_vec {
    () => { ... };
    ($($elem:expr),+ $(,)?) => { ... };
}

Creates a CompactVec containing the arguments.

compact_vec! allows creating a CompactVec with the same syntax as vec![]:

let v = compact_vec![1, 2, 3];
assert_eq!(v.as_slice(), &[1, 2, 3]);