docs: def status_mercurial(path, ignore_set, options):
      """Run hg status.
  
      Returns a 2-element tuple:
      * Text lines describing the status of the repository.
      * Empty sequence of subrepos, since hg does not support them.
      """
      lines = run(['hg', '--config', 'extensions.color=!', 'st'], cwd=path)
      subrepos = ()
      return [b' ' + l for l in lines if not l.startswith(b'?')], subrepos