http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59081
--- Comment #2 from Romain Geissler <romain.geissler at gmail dot com> --- It looks similar to http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41437 but in my case I used a second class, not a function. This issue is exactly like the one reported in http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47346 by Jason Merrill 2013-03-27 13:28:24 UTC, but not like the one you reported first.
