# Error code E0206

The `Copy` trait was implemented on a type which is neither a struct nor an enum.

Erroneous code example:

    #![allow(unused)]
    fn main() {
    #[derive(Copy, Clone)]
    struct Bar;

    impl Copy for &'static mut Bar { } // error!
    }

You can only implement `Copy` for a struct or an enum. The previous example will fail because `&'static mut Bar` is not a struct or enum.