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#### Note: this error code is no longer emitted by the compiler.
An attempt to implement the `Copy` trait for an enum failed because one of the
variants does not implement `Copy`. To fix this, you must implement `Copy` for
the mentioned variant. Note that this may not be possible, as in the example of
```compile_fail,E0204
enum Foo {
Bar(Vec<u32>),
Baz,
}
impl Copy for Foo { }
```
This fails because `Vec<T>` does not implement `Copy` for any `T`.
Here's another example that will fail:
```compile_fail,E0204
#[derive(Copy)]
enum Foo<'a> {
Bar(&'a mut bool),
Baz,
}
```
This fails because `&mut T` is not `Copy`, even when `T` is `Copy` (this
differs from the behavior for `&T`, which is always `Copy`).
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