2efc2d6366
Fix issue #2907. Update the "borrow box" lint to avoid recommending the following conversion: ``` // Old pub fn f(&mut Box<T>) {...} // New pub fn f(&mut T) {...} ``` Given a mutable reference to a box, functions may want to change "which" object the Box is pointing at. This change avoids recommending removing the "Box" parameter for mutable references. changelog: Don't trigger [`borrow_box`] lint on `&mut Box` references