ref: 2967f942ea0a9239ea316dd97b52f9cf2c2bfd6b
dir: /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>