error[E0748]: found both positive and negative implementation of trait `Foo` for type `u8`:
  --> $DIR/specialization-polarity.rs:9:1
   |
LL | impl<T> Foo for T {}
   | ----------------- positive implementation here
LL | impl !Foo for u8 {}
   | ^^^^^^^^^^^^^^^^ negative implementation here

error[E0748]: found both positive and negative implementation of trait `Bar` for type `u8`:
  --> $DIR/specialization-polarity.rs:14:1
   |
LL | impl<T> !Bar for T {}
   | ------------------ negative implementation here
LL | impl Bar for u8 {}
   | ^^^^^^^^^^^^^^^ positive implementation here

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0748`.