error[E0119]: conflicting implementations of trait `MyTrait<'_>` for type `&_`
  --> $DIR/coherence-negative-outlives-lifetimes.rs:18:1
   |
LL | impl<'a, T: MyPredicate<'a>> MyTrait<'a> for T {}
   | ---------------------------------------------- first implementation here
LL | impl<'a, T> MyTrait<'a> for &'a T {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `&_`
   |
   = note: downstream crates may implement trait `MyPredicate<'_>` for type `&_`

error: aborting due to 1 previous error

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