1 An attempt to implement the `Copy` trait for a struct failed because one of the
2 fields does not implement `Copy`. To fix this, you must implement `Copy` for the
3 mentioned field. Note that this may not be possible, as in the example of
13 This fails because `Vec<T>` does not implement `Copy` for any `T`.
15 Here's another example that will fail:
24 This fails because `&mut T` is not `Copy`, even when `T` is `Copy` (this
25 differs from the behavior for `&T`, which is always `Copy`).