warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/specialization-overlap-projection.rs:10:12
   |
LL | #![feature(specialization)]
   |            ^^^^^^^^^^^^^^
   |
   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
   = help: consider using `min_specialization` instead, which is more stable and complete
   = note: `#[warn(incomplete_features)]` on by default

error[E0119]: conflicting implementations of trait `Foo` for type `u32`
  --> $DIR/specialization-overlap-projection.rs:28:1
   |
LL | impl Foo for u32 {}
   | ---------------- first implementation here
LL | impl Foo for <u8 as Assoc>::Output {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `u32`

error[E0119]: conflicting implementations of trait `Foo` for type `u32`
  --> $DIR/specialization-overlap-projection.rs:30:1
   |
LL | impl Foo for u32 {}
   | ---------------- first implementation here
...
LL | impl Foo for <u16 as Assoc>::Output {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `u32`

error[E0282]: type annotations needed
  --> $DIR/specialization-overlap-projection.rs:17:27
   |
LL |     default type Output = bool;
   |                           ^^^^ cannot infer type for associated type `<T as Assoc>::Output`

error[E0282]: type annotations needed
  --> $DIR/specialization-overlap-projection.rs:21:35
   |
LL | impl Assoc for u8 { type Output = u8; }
   |                                   ^^ cannot infer type for associated type `<u8 as Assoc>::Output`

error[E0282]: type annotations needed
  --> $DIR/specialization-overlap-projection.rs:23:36
   |
LL | impl Assoc for u16 { type Output = u16; }
   |                                    ^^^ cannot infer type for associated type `<u16 as Assoc>::Output`

error: aborting due to 5 previous errors; 1 warning emitted

Some errors have detailed explanations: E0119, E0282.
For more information about an error, try `rustc --explain E0119`.