http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59701
--- Comment #1 from Ville Voutilainen <ville.voutilainen at gmail dot com> --- The testcase caused an ICE in recent versions of clang, and was fixed so that the code is rejected by clang. This is related to Core Issue 1430, so the bug should probably be on hold until CWG decides the outcome of that issue.