error[E0277]: can't compare `Bar` with `(Foo, i32)`
  --> $DIR/recursive-type-alias-impl-trait-declaration.rs:13:13
   |
LL | fn foo() -> Foo {
   |             ^^^ no implementation for `Bar == (Foo, i32)`
LL |
LL |     Bar
   |     --- return type was inferred to be `Bar` here
   |
   = help: the trait `PartialEq<(Foo, i32)>` is not implemented for `Bar`
   = help: the trait `PartialEq<(Bar, i32)>` is implemented for `Bar`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.