warning: unused import: `crate::mac`
  --> $DIR/unused-macro-import.rs:10:9
   |
LL |     use crate::mac;
   |         ^^^^^^^^^^
   |
note: the lint level is defined here
  --> $DIR/unused-macro-import.rs:3:9
   |
LL | #![warn(unused_imports)]
   |         ^^^^^^^^^^^^^^

warning: 1 warning emitted