error[E0119]: conflicting implementations of trait `OtherTrait` for type `()` --> $DIR/coherence-conflict.rs:12:1 | LL | impl OtherTrait for () {} | ---------------------- first implementation here LL | impl OtherTrait for T {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `()` | = note: this impl is reserved error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0119`.