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error: this pattern takes a reference on something that is being de-referenced
--> $DIR/needless_borrowed_ref.rs:7:34
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LL | let _ = v.iter_mut().filter(|&ref a| a.is_empty());
| ^^^^^^ help: try removing the `&ref` part and just keep: `a`
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= note: `-D clippy::needless-borrowed-reference` implied by `-D warnings`
error: aborting due to previous error
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