http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47721 --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-02-13 21:14:50 UTC --- They're right, see http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1791.pdf Documented as unimplemented at http://gcc.gnu.org/gcc-4.6/cxx0x_status.html