warning: variant is never constructed: `Void`
  --> $DIR/derive-uninhabited-enum-38885.rs:13:5
   |
LL |     Void(Void),
   |     ^^^^^^^^^^
   |
   = note: `-W dead-code` implied by `-W unused`
note: `Foo` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
  --> $DIR/derive-uninhabited-enum-38885.rs:10:10
   |
LL | #[derive(Debug)]
   |          ^^^^^
   = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: 1 warning emitted