error[E0308]: mismatched types
  --> $DIR/fully-qualified-type-name2.rs:12:12
   |
LL |     return x;
   |            ^ expected enum `y::Foo`, found enum `x::Foo`
   |
   = note: expected type `y::Foo`
              found type `x::Foo`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.