- `std::boxed::Box<dyn Foo> : std::clone::Clone`
- = help: items from traits can only be used if the trait is implemented and in scope
- = note: the following trait defines an item `clone`, perhaps you need to implement it:
- candidate #1: `std::clone::Clone`
+ `dyn Foo: std::marker::Sized`
+ which is required by `std::boxed::Box<dyn Foo>: std::clone::Clone`
+ `dyn Foo: std::clone::Clone`
+ which is required by `std::boxed::Box<dyn Foo>: std::clone::Clone`