error[E0271]: type mismatch resolving `<Foo<()> as FooLike>::Output == <T as Trait>::Assoc`
  --> $DIR/bound-normalization-fail.rs:25:32
   |
LL |     fn foo_fail<T: Trait>() -> impl FooLike<Output = T::Assoc> {
   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type mismatch resolving `<Foo<()> as FooLike>::Output == <T as Trait>::Assoc`
LL |
LL |         Foo(())
   |         ------- return type was inferred to be `Foo<()>` here
   |
note: expected this to be `()`
  --> $DIR/bound-normalization-fail.rs:14:19
   |
LL |     type Output = T;
   |                   ^
   = note:    expected unit type `()`
           found associated type `<T as impl_trait::Trait>::Assoc`
help: consider constraining the associated type `<T as impl_trait::Trait>::Assoc` to `()`
   |
LL |     fn foo_fail<T: Trait<Assoc = ()>>() -> impl FooLike<Output = T::Assoc> {
   |                         ++++++++++++

error[E0271]: type mismatch resolving `<Foo<()> as FooLike>::Output == <T as Trait<'a>>::Assoc`
  --> $DIR/bound-normalization-fail.rs:41:41
   |
LL |     fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output = T::Assoc> {
   |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type mismatch resolving `<Foo<()> as FooLike>::Output == <T as Trait<'a>>::Assoc`
LL |
LL |         Foo(())
   |         ------- return type was inferred to be `Foo<()>` here
   |
note: expected this to be `()`
  --> $DIR/bound-normalization-fail.rs:14:19
   |
LL |     type Output = T;
   |                   ^
   = note:    expected unit type `()`
           found associated type `<T as lifetimes::Trait<'a>>::Assoc`
help: consider constraining the associated type `<T as lifetimes::Trait<'a>>::Assoc` to `()`
   |
LL |     fn foo2_fail<'a, T: Trait<'a, Assoc = ()>>() -> impl FooLike<Output = T::Assoc> {
   |                                 ++++++++++++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0271`.