warning: unused macro definition
  --> $DIR/issue-70041.rs:4:1
   |
LL | / macro_rules! regex {
LL | |
LL | |     () => {};
LL | | }
   | |_^
   |
   = note: `#[warn(unused_macros)]` on by default

warning: unused import: `regex`
  --> $DIR/issue-70041.rs:10:5
   |
LL | use regex;
   |     ^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: 2 warnings emitted