ref: a3b95d3e567c0ef60f9f1ead26124fb706dec20d
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>