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warning: unused `Result` that must be used
--> $DIR/must-use-in-macro-55516.rs:9:5
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LL | write!(&mut example, "{}", 42);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: this `Result` may be an `Err` variant, which should be handled
= note: `-W unused-must-use` implied by `-W unused`
= help: to override `-W unused` add `#[allow(unused_must_use)]`
help: use `let _ = ...` to ignore the resulting value
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LL | let _ = write!(&mut example, "{}", 42);
| +++++++
warning: 1 warning emitted
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