http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52465
--- Comment #4 from fabien at gcc dot gnu.org 2012-03-04 21:52:15 UTC --- This is because some USING_DECLs are stored in IDENTIDIER_BINDINGs. Jason, do you agree that cxx_binding->value and cxx_binding->type should not be USING_DECLs ?