[libcxx-commits] [libcxx] [libcxx] Put `std::monostate` in `<utility>` (PR #128373)

[A. Jiang via libcxx-commits]

================
@@ -279,6 +279,10 @@ template <class T>
 #    include <__utility/unreachable.h>
 #  endif
 
+#  if _LIBCPP_STD_VER >= 26
----------------
frederick-vs-ja wrote:

I _guess_ some maintainers want this to be in the `#  if _LIBCPP_STD_VER >= 17` region, although I have no strong preference.

https://github.com/llvm/llvm-project/pull/128373