code: def failures():
      
      if not HAVE_BIN_LIBS:
          click.echo("missing required binary libs (lz4, msgpack)")
          return
  
      q = Queue('failed', connection=worker.connection)
      for i in q.get_job_ids():
          j = q.job_class.fetch(i, connection=q.connection)
          click.echo("%s on %s" % (j.func_name, j.origin))
          if not j.func_name.endswith('process_keyset'):
              click.echo("params %s %s" % (j._args, j._kwargs))
          click.echo(j.exc_info)
docs: Show any unexpected failures