error: concrete type differs from previous defining opaque type use
  --> $DIR/different_defining_uses_never_type.rs:12:13
   |
LL | fn bar() -> Foo {
   |             ^^^ expected `&'static str`, got `()`
   |
note: previous use here
  --> $DIR/different_defining_uses_never_type.rs:9:5
   |
LL |     ""
   |     ^^

error: aborting due to previous error