1 warning: struct `S` is never constructed
2 --> $DIR/macro-span-replacement.rs:7:12
8 | ------------ in this macro invocation
10 note: the lint level is defined here
11 --> $DIR/macro-span-replacement.rs:3:9
15 = note: `#[warn(dead_code)]` implied by `#[warn(unused)]`
16 = note: this warning originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info)
18 warning: 1 warning emitted