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But widgets do have the same type: Widget, which the author already uses as a trait object. I think he was getting confused by mixing &Widget and Rc<RefCell<Widget>>. Just declare a type alias for the latter, use it everywhere, and it should work. You would do the about the same thing in C++, I believe.

In that case, just use Vec<Box<Widget>>, which means "a vector of objects which implement the Widget interface."

Yes, it does. You can use a trait to provide extensibility.