error[E0517]: attribute should be applied to a struct or union
  --> $DIR/repr-empty-packed.rs:5:8
   |
LL |   #[repr(packed)]
   |          ^^^^^^
LL | / pub enum Foo {
LL | |     Bar,
LL | |     Baz(i32),
LL | | }
   | |_- not a struct or union

error: unused attribute
  --> $DIR/repr-empty-packed.rs:4:1
   |
LL | #[repr()]
   | ^^^^^^^^^ help: remove this attribute
   |
   = note: using `repr` with an empty list has no effect
note: the lint level is defined here
  --> $DIR/repr-empty-packed.rs:2:9
   |
LL | #![deny(unused_attributes)]
   |         ^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0517`.