error[E0720]: cannot resolve opaque type
  --> $DIR/infinite-impl-trait-issue-38064.rs:8:13
   |
LL | fn foo() -> impl Quux {
   |             ^^^^^^^^^ recursive opaque type
...
LL |     Foo(bar())
   |     ---------- returning here with type `foo::Foo<impl Quux>`
...
LL | fn bar() -> impl Quux {
   |             --------- returning this opaque type `foo::Foo<impl Quux>`

error[E0720]: cannot resolve opaque type
  --> $DIR/infinite-impl-trait-issue-38064.rs:14:13
   |
LL | fn foo() -> impl Quux {
   |             --------- returning this opaque type `bar::Bar<impl Quux>`
...
LL | fn bar() -> impl Quux {
   |             ^^^^^^^^^ recursive opaque type
...
LL |     Bar(foo())
   |     ---------- returning here with type `bar::Bar<impl Quux>`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0720`.