Within a larger expression, when the type of `Box::new(T::default())` is `Box<dyn Trait>`, the concrete type `T` cannot be omitted in the proposed replacement `Box::<T>::default()`.
Within a larger expression, when the type of `Box::new(T::default())` is `Box<dyn Trait>`, the concrete type `T` cannot be omitted in the proposed replacement `Box::<T>::default()`.