error: this pattern takes a reference on something that is being de-referenced --> $DIR/needless_borrowed_ref.rs:8:34 | 8 | let _ = v.iter_mut().filter(|&ref a| a.is_empty()); | ^^^^^^ help: try removing the `&ref` part and just keep: `a` | = note: `-D needless-borrowed-reference` implied by `-D warnings` error: this pattern takes a reference on something that is being de-referenced --> $DIR/needless_borrowed_ref.rs:13:17 | 13 | if let Some(&ref v) = thingy { | ^^^^^^ help: try removing the `&ref` part and just keep: `v` error: this pattern takes a reference on something that is being de-referenced --> $DIR/needless_borrowed_ref.rs:42:27 | 42 | (&Animal::Cat(v), &ref k) | (&ref k, &Animal::Cat(v)) => (), // lifetime mismatch error if there is no '&ref' | ^^^^^^ help: try removing the `&ref` part and just keep: `k` error: this pattern takes a reference on something that is being de-referenced --> $DIR/needless_borrowed_ref.rs:42:38 | 42 | (&Animal::Cat(v), &ref k) | (&ref k, &Animal::Cat(v)) => (), // lifetime mismatch error if there is no '&ref' | ^^^^^^ help: try removing the `&ref` part and just keep: `k`