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After installation from trunk, the action url http://my.example.com/wiki/index.php?title=Blog&action=feed throws this MediaWiki error:

"The action specified by the URL is invalid. You might have mistyped the URL, or followed an incorrect link. This might also indicate a bug in the software used"

Extension is in MW SVN 
http://svn.wikimedia.org/viewvc/mediawiki/trunk/extensions/WikiArticleFeeds/

Problem has been identified, but not finally solved.

Depends on https://bugzilla.wikimedia.org/show_bug.cgi?id=34203
(Unknown page action hook problem: the hook must pass the unknown action to the callee and not the value "nosuchaction"

fixed in core r110716