error: enum with no variants
  --> $DIR/empty_enum.rs:5:1
   |
LL | enum Empty {}
   | ^^^^^^^^^^^^^
   |
   = note: `-D clippy::empty-enum` implied by `-D warnings`
   = help: consider using the uninhabited type `!` (never type) or a wrapper around it to introduce a type which can't be instantiated

error: aborting due to previous error