> I used to TA a freshman data structures class. I can't imagine ever going to a class of new programmers and trying to explain to them when to use Rc<RefCell<V

> I used to TA a freshman data structures class. I can't imagine ever going to a class of new programmers and trying to explain to them when to use Rc<RefCell<Vec<T>>> vs. Rc<Vec<RefCell<T>>>. I'm interested - how do you teach it? I would have thought that the type system could make these things easier to visualise rather than harder, but then I don't have teaching experience.