error[E0204]: the trait `Copy` cannot be implemented for this type
 --> tests/ui/derive/set_copy_fail.rs:5:5
  |
4 |     #[derive(Copy, Clone)]
  |              ---- in this derive macro expansion
5 |     SetA = {
  |     ^^^^
6 |         Variant1(String),
  |                  ------ this field does not implement `Copy`
