No I don't know Rust very well, I really should put in some time to learn it properly! I did a bit of GUI programming in the past, and felt there is a bit of impedance mismatch with Rust there. And the kind of subtle mistakes with ownership and reference cycles you tend to make in C++, but discover when you move to unique_ptr: Rust also ruthlessly uncovers them, but I guess I need more experience how to solve them.