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`derive` was applied on something which is not a struct, a union or an enum.
Erroneous code example:
```compile_fail,E0774
trait Foo {
#[derive(Clone)] // error!
type Bar;
}
```
As said above, the `derive` attribute is only allowed on structs, unions or
enums:
```
#[derive(Clone)] // ok!
struct Bar {
field: u32,
}
```
You can find more information about `derive` in the [Rust Book].
[Rust Book]: https://doc.rust-lang.org/book/appendix-03-derivable-traits.html
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