error[E0119]: conflicting implementations of trait `Trait` for type `Wrapper<OpaqueCoroutine>`
  --> $DIR/coherence-with-coroutine.rs:21:1
   |
LL | impl Trait for Wrapper<OpaqueCoroutine> {}
   | --------------------------------------- first implementation here
LL | impl<T: Sync> Trait for Wrapper<T> {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `Wrapper<OpaqueCoroutine>`

error: aborting due to previous error

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