templates/rss/error.tmpl

hgk: use set instead of dict

{header}
    <title>Error</title>
    <description>Error</description>
    <item>
      <title>Error</title>
      <description>{error|escape}</description>
      <guid>http://www.selenic.com/mercurial/#error</guid>
    </item>
  </channel>
</rss>