Strictly speaking Rust doesn't prevent memory leaks. You can easily create cycles in reference counted types, or `std::mem::forget` something. No use of unsafe

Strictly speaking Rust doesn't prevent memory leaks. You can easily create cycles in reference counted types, or `std::mem::forget` something. No use of unsafe required either. That said as long as you don't build graphs with reference counted types it's hard to leak memory by accident.