libsugar
macro_rules! deque { [] => { ... }; [ $elem:expr; $n:expr ] => { ... }; [ $($e:expr),* $(,)? ] => { ... }; }
new a VecDeque<T>
VecDeque<T>
deque![a, b, c]
equivalent to
VecDeque::from(vec![a, b, c])