see also https://www.reddit.com/r/rust/comments/19871c5/passing_nothing_is_surprisingly_difficult/ki5fu0i/ https://www.reddit.com/r/rust/comments/19871c5/passin

see also https://www.reddit.com/r/rust/comments/19871c5/passing_nothing_is_surprisingly_difficult/ki5fu0i/ https://www.reddit.com/r/rust/comments/19871c5/passing_nothi...