error[E0308]: mismatched types
  --> $DIR/issue-35241.rs:13:20
   |
13 | fn test() -> Foo { Foo } //~ ERROR mismatched types
   |              ---   ^^^
   |              |     |
   |              |     expected struct `Foo`, found fn item
   |              |     did you mean `Foo(/* fields */)`?
   |              expected `Foo` because of return type
   |
   = note: expected type `Foo`
              found type `fn(u32) -> Foo {Foo::{{constructor}}}`

error: aborting due to previous error

If you want more information on this error, try using "rustc --explain E0308"