error: struct is never constructed: `F`
  --> $DIR/lint-dead-code-unused-enum.rs:3:1
   |
LL | struct F;
   | ^^^^^^^^^
   |
note: lint level defined here
  --> $DIR/lint-dead-code-unused-enum.rs:1:9
   |
LL | #![deny(unused)]
   |         ^^^^^^
   = note: `#[deny(dead_code)]` implied by `#[deny(unused)]`

error: struct is never constructed: `B`
  --> $DIR/lint-dead-code-unused-enum.rs:4:1
   |
LL | struct B;
   | ^^^^^^^^^

error: enum is never used: `E`
  --> $DIR/lint-dead-code-unused-enum.rs:6:1
   |
LL | enum E {
   | ^^^^^^

error: aborting due to 3 previous errors