LL | #![warn(unused)]
| ^^^^^^
= note: `#[warn(dead_code)]` implied by `#[warn(unused)]`
- = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
+ = note: this warning originates in the macro `m` (in Nightly builds, run with -Z macro-backtrace for more info)
warning: 1 warning emitted