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I really want to amend that. Writing a doubly linked list in safe Rust is very hard if you want to hand out references to its contents. If you're willing to use `Rc<RefCell<...>>` or `Arc<Mutex<...>>`, then it gets doable again (albeit pretty verbose), but you can no longer hand out pure references. That's because a reference means "I have statically verified that no one else can possibly mutate this things as long as this reference is valid." `RefCell` and `Mutex` replace some of that static guarantee with runtime bookkeeping, which is great for situations where your objects don't have unique owners, but it requires you to manage all your references with smart pointers, and your APIs can't hide that (in safe code).



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