warning: unused attribute
  --> $DIR/macro-use-all-and-none.rs:7:12
   |
LL | #[macro_use()]
   |            ^^ help: remove these parentheses
   |
   = note: using `macro_use` with an empty list is equivalent to not using a list at all
note: the lint level is defined here
  --> $DIR/macro-use-all-and-none.rs:4:9
   |
LL | #![warn(unused_attributes)]
   |         ^^^^^^^^^^^^^^^^^

warning: 1 warning emitted