error[E0119]: conflicting implementations of trait `Overlap<u32>` for type `u32`
  --> $DIR/trivial-unsized-projection-in-coherence.rs:37:1
   |
LL |   impl<T> Overlap<u32> for T {
   |   -------------------------- first implementation here
...
LL | / impl<U> Overlap<U> for u32
LL | |
LL | | where
LL | |     MaybeUnsized<U, u32>: RelateReqSized,
   | |_________________________________________^ conflicting implementation for `u32`

error: aborting due to 1 previous error

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