http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54158
--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-08-02 10:51:32 UTC --- 2009-03-31 Jason Merrill <ja...@redhat.com> C++ DR 613 * semantics.c (finish_non_static_data_member): Allow such references without an associated object in sizeof/decltype/alignof.