http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46732
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2010-11-30 20:27:48 UTC --- there was a bug in a previous version of gcc where it wouldn't bind an rvalue reference directly, and so std::forward returned a reference to a temporary that's fixed in more recent versions, I'll try to find it again and see if it was meant to be fixed in 4.4.4
