error: Typedef can't support enums with a mix of unit and struct variants
 --> tests/derive_errors/enum/mixed.rs:2:6
  |
2 | enum Mixed {
  |      ^^^^^

error: here's a unit variant of `Mixed`
 --> tests/derive_errors/enum/mixed.rs:3:5
  |
3 |     Foo,
  |     ^^^

error: here's a struct variant of `Mixed`
 --> tests/derive_errors/enum/mixed.rs:4:5
  |
4 |     Bar { x: u32 },
  |     ^^^^^^^^^^^^^^