error[E0119]: conflicting implementations of trait `Foo<i32>` for type `i32`
  --> $DIR/coherence-projection-conflict.rs:11:1
   |
LL | impl Foo<i32> for i32 { }
   | --------------------- first implementation here
LL |
LL | impl<A:Bar> Foo<A::Output> for A { }
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `i32`

error: aborting due to 1 previous error

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