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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