error: cannot find attribute `dummy` in this scope
  --> $DIR/derive-helper-legacy-spurious.rs:3:4
   |
LL | #![dummy]
   |    ^^^^^

error: cannot determine resolution for the attribute macro `derive`
  --> $DIR/derive-helper-legacy-spurious.rs:8:3
   |
LL | #[derive(Empty)]
   |   ^^^^^^
   |
   = note: import resolution is stuck, try simplifying macro imports

error: cannot find attribute `empty_helper` in this scope
  --> $DIR/derive-helper-legacy-spurious.rs:9:3
   |
LL | #[empty_helper]
   |   ^^^^^^^^^^^^

error: aborting due to 3 previous errors