def check_stops(pfeed, *, as_df=False, include_warnings=False):
    """
    Analog of :func:`check_frequencies` for ``pfeed.stops``
    """
    # Use gtfstk's stop validator
    if pfeed.stops is not None:
        stop_times = pd.DataFrame(columns=['stop_id'])
        feed = gt.Feed(stops=pfeed.stops, stop_times=stop_times,
          dist_units='km')
        return gt.check_stops(feed, as_df=as_df, include_warnings=False)