error[E0119]: conflicting implementations of trait `Trait` for type `LocalTy`
  --> $DIR/unstable_impl_coherence.rs:14:1
   |
LL | impl aux::Trait for LocalTy {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: conflicting implementation in crate `unstable_impl_coherence_aux`:
           - impl<T> Trait for T
             where unstable feature: `foo`;

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0119`.