error[E0119]: conflicting implementations of trait `OtherTrait` for type `()`
  --> $DIR/coherence-conflict.rs:12:1
   |
LL | impl OtherTrait for () {}
   | ---------------------- first implementation here
LL | impl<T: MyTrait> 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`.