Politely mention that Box<&T> is almost the most useless type you can have #2394
Description
Found in the wild: https://stackoverflow.com/questions/48406077/mutation-of-a-variable-inside-while-loop
List of types that make no sense that we should be linting about:
Box<&T>Box::new(SomeT)wheresizeof::<T>() <= sizeof::<usize>()- unless there are
Box::into_rawcalls within the function
- unless there are
Rc<Box<T>>Rc<Rc<T>>Rc<&T>- more...?