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warning: method `dummy` is never used
--> $DIR/macro-self-mutability-7911.rs:8:8
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LL | trait FooBar {
| ------ method in this trait
LL | fn dummy(&self) { }
| ^^^^^
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= note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
warning: 1 warning emitted
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