| warning: unused `std::result::Result` that must be used | |
| --> $DIR/must-use-in-macro-55516.rs:9:5 | |
| | | |
| LL | write!(&mut example, "{}", 42); | |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
| | | |
| = note: `-W unused-must-use` implied by `-W unused` | |
| = note: this `Result` may be an `Err` variant, which should be handled | |
| = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info) | |