There are more game engines written in Rust than games written in Rust.
So maybe there are more GUI libraries than dialog windows written in Rust as well.
The referenced issue has nothing to do with Rust. One would have to dug deeper and not relay on random comment to figure out. So I'm not expecting you to do it when even content of your comment is bit lazy copy-paste.
But even so, without checking the actual Github, it was already explained here [0], before you have posted.
