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error[E0774]: `derive` may only be applied to `struct`s, `enum`s and `union`s
--> $DIR/macros-in-extern-derive.rs:2:5
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LL | #[derive(Copy)]
| ^^^^^^^^^^^^^^^ not applicable here
LL | fn f();
| ------- not a `struct`, `enum` or `union`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0774`.
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