Add `NonNull::<[T]>::is_empty`. As per https://github.com/rust-lang/rust/issues/71146#issuecomment-2008373983 I figured this should be fine to be insta-stable (with an FCP), but I can edit if that is not desired. r? ```@Amanieu```
Add `NonNull::<[T]>::is_empty`. As per https://github.com/rust-lang/rust/issues/71146#issuecomment-2008373983 I figured this should be fine to be insta-stable (with an FCP), but I can edit if that is not desired. r? ```@Amanieu```