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The `Copy` trait was implemented on a type with a `Drop` implementation.
Erroneous code example:
```compile_fail,E0184
#[derive(Copy)]
struct Foo; // error!
impl Drop for Foo {
fn drop(&mut self) {
}
}
```
Explicitly implementing both `Drop` and `Copy` trait on a type is currently
disallowed. This feature can make some sense in theory, but the current
implementation is incorrect and can lead to memory unsafety (see
[issue #20126][iss20126]), so it has been disabled for now.
[iss20126]: https://github.com/rust-lang/rust/issues/20126
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