<div dir="ltr"><div><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0195r2.html">http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0195r2.html</a> suggests a feature test macro of __cpp_variadic_using; the value would presumably be 201611. Does that seem OK to everyone?<br></div></div>