message: Fixed clippy::len_zero in brainfuck Bench
diff: @@ -170,7 +170,7 @@ fn bf_loopity(b: &mut Bencher) -> runestick::Result<()> {
  execution.complete().expect("successful execution");
  });
  assert!(rune_tests::capture_output::drain_output()
  - .map(|v| v.len() == 0)
  + .map(|v| v.is_empty())
  .unwrap_or(false));
  Ok(())
  }
  