src/tools/clippy/tests/ui/needless_borrowed_ref.stderr

   1 error: this pattern takes a reference on something that is being de-referenced
   2   --> $DIR/needless_borrowed_ref.rs:7:34
   3    |
   4 LL |     let _ = v.iter_mut().filter(|&ref a| a.is_empty());
   5    |                                  ^^^^^^ help: try removing the `&ref` part and just keep: `a`
   6    |
   7    = note: `-D clippy::needless-borrowed-reference` implied by `-D warnings`
   8
   9 error: aborting due to previous error
  10