https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67617
--- Comment #4 from Daniel Krügler <daniel.kruegler at googlemail dot com> --- (In reply to Jonathan Wakely from comment #2) > Both Clang/libc++ and MSVC/Dinkumware reject it for the same reason. I notice that the Dinkumware version associated with Visual Studio 2015 accepts the code.
