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A literal value was used inside `#[derive]`.
Erroneous code example:
```compile_fail,E0777
#[derive("Clone")] // error!
struct Foo;
```
Only paths to traits are allowed as argument inside `#[derive]`. You can find
more information about the `#[derive]` attribute in the [Rust Book].
```
#[derive(Clone)] // ok!
struct Foo;
```
[Rust Book]: https://doc.rust-lang.org/book/appendix-03-derivable-traits.html
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