vecmerge

A macro for merging vectors.

Examples

```rust use vecmerge::vecmerge;

assert_eq! { vecmerge!([1, 2, 3] + [4, 5] + [6]), vec![1, 2, 3, 4, 5, 6], }

let a = vec![1, 2, 3]; let b = vec![6];

assert_eq! { vecmerge!(a + [4, 5] + b), vec![1, 2, 3, 4, 5, 6], }

assert_eq! { vecmerge!(vec![1, 2, 3] + vec![4, 5, 6]), vec![1, 2, 3, 4, 5, 6], }

assert_eq! { vecmerge!([Some(1)]? + [None]? + [Some(3)]? + [4, 5, 6]), vec![1, 3, 4, 5, 6], }

assert_eq! { vecmerge!([Some(1), Some(2), Some(3)]? + [4, 5, 6]), vec![1, 2, 3, 4, 5, 6], }

assert_eq! { vecmerge!([Some(1), None, Some(3)]? + [4, 5, 6]), vec![4, 5, 6], } ```