https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68604
--- Comment #2 from Shafik Yaghmour <yaghmour.shafik at gmail dot com> --- Wandbox has clang 3.8 and we can see that clang accepts this in C++11 mode: http://melpon.org/wandbox/permlink/IzawQ5DDLFyIyQNo but not in C++03 mode: http://melpon.org/wandbox/permlink/IzawQ5DDLFyIyQNo. Note, defect report 613: http://open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#613 has CD1 status.
