| error[E0119]: conflicting implementations of trait `SpecTrait<(), ()>` for type `()` | |
| --> $DIR/impl-on-opaque2.rs:21:1 | |
| | | |
| LL | impl<U> SpecTrait<U, ()> for () { | |
| | ------------------------------- first implementation here | |
| ... | |
| LL | impl SpecTrait<(), Opaque> for () { | |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `()` | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0119`. |