I'm not sure whether anybody was aware of this, but the Doxygen documentation at http://svn.wikimedia.org/doc has suddenly broken down. It's still online, but all the actual class and function definitions have disappeared.
On IRC,
10:20 <hashar> Amgine_: I broke it 10:20 <hashar> will be fixed next time the doc is regenerated
So it's known, and apparently fixed.