class RDoc::Markdown

def _Heading
  _save = self.pos
  while true # choice
    _tmp = apply(:_SetextHeading)
    break if _tmp
    self.pos = _save
    _tmp = apply(:_AtxHeading)
    break if _tmp
    self.pos = _save
    break
  end # end choice
  set_failed_rule :_Heading unless _tmp
  return _tmp
end