class RDoc::Markdown

def failure_oneline
  p = current_pos_info @failing_rule_offset
  if @failed_rule.kind_of? Symbol
    info = self.class::Rules[@failed_rule]
    "@#{p.lno}:#{p.col} failed rule '#{info.name}', got '#{p.char}'"
  else
    "@#{p.lno}:#{p.col} failed rule '#{@failed_rule}', got '#{p.char}'"
  end
end