warning: struct is never used: `S`
--> $DIR/macro-span-replacement.rs:15:9
|
15 | $b $a; //~ WARN struct is never used
| ^^^^^^
...
20 | m!(S struct);
| ------------- in this macro invocation
note: lint level defined here
--> $DIR/macro-span-replacement.rs:11:9
11 | #![warn(unused)]
= note: #[warn(dead_code)] implied by #[warn(unused)]