warning: struct is never constructed: `S` | |
--> $DIR/macro-span-replacement.rs:7:14 | |
| | |
LL | $b $a; | |
| ^ | |
... | |
LL | m!(S struct); | |
| ------------- in this macro invocation | |
| | |
note: lint level defined here | |
--> $DIR/macro-span-replacement.rs:3:9 | |
| | |
LL | #![warn(unused)] | |
| ^^^^^^ | |
= note: `#[warn(dead_code)]` implied by `#[warn(unused)]` | |