error: this expression borrows a reference that is immediately dereferenced by the compiler --> $DIR/needless_borrow.rs:13:15 | 13 | let c = x(&&a); | ^^^ help: change this to: `&a` | = note: `-D needless-borrow` implied by `-D warnings` error: this pattern creates a reference to a reference --> $DIR/needless_borrow.rs:20:17 | 20 | if let Some(ref cake) = Some(&5) {} | ^^^^^^^^ help: change this to: `cake` error: this expression borrows a reference that is immediately dereferenced by the compiler --> $DIR/needless_borrow.rs:27:15 | 27 | 46 => &&a, | ^^^ help: change this to: `&a` error: this pattern takes a reference on something that is being de-referenced --> $DIR/needless_borrow.rs:49:34 | 49 | 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_borrow.rs:50:30 | 50 | let _ = v.iter().filter(|&ref a| a.is_empty()); | ^^^^^^ help: try removing the `&ref` part and just keep: `a` error: this pattern creates a reference to a reference --> $DIR/needless_borrow.rs:50:31 | 50 | let _ = v.iter().filter(|&ref a| a.is_empty()); | ^^^^^ help: change this to: `a` error: using a reference to `Cow` is not recommended. --> $DIR/needless_borrow.rs:56:25 | 56 | fn test_cow_with_ref(c: &Cow<[i32]>) { | ^^^^^^^^^^^ help: change this to: `&[i32]` | = note: `-D ptr-arg` implied by `-D warnings` error: aborting due to 7 previous errors