refmutn_lines

This defines a nested mutable reference.

```rs use refmutnlines::refmutnlines;

fn main() { let mut data = [[0u8; 3]; 4]; let refdata: &mut [&mut [u8]] = refmutn_lines!(data, 4); } ```

work as

rs let _ref_data: &mut [&mut [u8]] = { let [ref mut a0, ref mut a1, ref mut a2, ref mut a3] = data; &mut[a0, a1, a2, a3] }