Plan 9 from Bell Labs’s /usr/web/sources/contrib/bichued/root/sys/src/cmd/hg/templates/rss/error.tmpl
{header} <title>Error</title> <description>Error</description> <item> <title>Error</title> <description>{error|escape}</description> <guid>http://mercurial.selenic.com/#error</guid> </item> </channel> </rss>