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#### Note: this error code is no longer emitted by the compiler.
A negative impl was added on a trait implementation.
Erroneous code example:
```compile_fail
trait Trait {
type Bar;
}
struct Foo;
impl !Trait for Foo { } //~ ERROR
fn main() {}
```
Negative impls are only allowed for auto traits. For more
information see the [opt-in builtin traits RFC][RFC 19].
[RFC 19]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
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