warning: unused attribute
  --> $DIR/macro-use-all-and-none.rs:7:1
   |
LL | #[macro_use()]
   | ^^^^^^^^^^^^^^ help: remove this attribute
   |
   = note: attribute `macro_use` with an empty list has no effect
note: the lint level is defined here
  --> $DIR/macro-use-all-and-none.rs:4:9
   |
LL | #![warn(unused_attributes)]
   |         ^^^^^^^^^^^^^^^^^

warning: 1 warning emitted