collections::vec!

macro_rules! vec {
    ($($x:expr),*) => ({
        let xs: $crate::boxed::Box<[_]> = $crate::boxed::Box::new([$($x),*]);
        $crate::slice::SliceExt::into_vec(xs)
    });
    ($($x:expr,)*) => (vec![$($x),*])
}

Creates a Vec containing the arguments.