1. As your other reply said, crossbeam is Rust's gold-standard for this. 2. Make the front-pointers be Rc's or Arc's, then use the downgrade() method to constr

1. As your other reply said, crossbeam is Rust's gold-standard for this. 2. Make the front-pointers be Rc's or Arc's, then use the downgrade() method to construct the back-pointers. 3. Array-based ring buffer instead, perhaps? 4. Like any refactoring, the compiler errors guide you to the places that you haven't yet changed.