error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
  --> $DIR/needless_borrow.rs:14:15
   |
LL |     let c = x(&&a);
   |               ^^^ help: change this to: `&a`
   |
   = note: `-D clippy::needless-borrow` implied by `-D warnings`

error: this pattern creates a reference to a reference
  --> $DIR/needless_borrow.rs:21:17
   |
LL |     if let Some(ref cake) = Some(&5) {}
   |                 ^^^^^^^^ help: change this to: `cake`

error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
  --> $DIR/needless_borrow.rs:28:15
   |
LL |         46 => &&a,
   |               ^^^ help: change this to: `&a`

error: this pattern creates a reference to a reference
  --> $DIR/needless_borrow.rs:51:31
   |
LL |     let _ = v.iter().filter(|&ref a| a.is_empty());
   |                               ^^^^^ help: change this to: `a`

error: aborting due to 4 previous errors