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`

a> $DIR/needless_borrow.rs:56:25: 56:36
b> $DIR/needless_borrow.rs:56:25: 56:36
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: `Cow<[i32]>`
   |
   = note: `-D ptr-arg` implied by `-D warnings`

error: aborting due to 7 previous errors