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The `Copy` trait was implemented on a type which is neither a struct, an
enum, nor a union.
Erroneous code example:
```compile_fail,E0206
#[derive(Copy, Clone)]
struct Bar;
impl Copy for &'static mut Bar { } // error!
```
You can only implement `Copy` for a struct, an enum, or a union.
The previous example will fail because `&'static mut Bar`
is not a struct, an enum, or a union.
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