error: variant is never constructed: `Bar`
  --> $DIR/lint-dead-code-unused-variant.rs:8:5
   |
LL |     Bar(B),
   |     ^^^^^^
   |
note: lint level defined here
  --> $DIR/lint-dead-code-unused-variant.rs:1:9
   |
LL | #![deny(unused)]
   |         ^^^^^^
   = note: `#[deny(dead_code)]` implied by `#[deny(unused)]`

error: aborting due to previous error