Guard with _LIBCPP_STD_VER >= 23 and update test

Signed-off-by: yronglin <[email protected]>

Author: yronglin

libcxx/include/tuple

@@ -1456,10 +1456,12 @@ template <class _Tp, class _Tuple, class = enable_if_t<__can_make_from_tuple<_Tp
 inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp make_from_tuple(_Tuple&& __t)
   noexcept(noexcept(std::__make_from_tuple_impl<_Tp>(std::forward<_Tuple>(__t),
                     make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>()))) {
+#if _LIBCPP_STD_VER >= 23
   if constexpr (tuple_size_v<remove_reference_t<_Tuple>> == 1) {
     static_assert(!__reference_constructs_from_temporary_v<_Tp, decltype(std::get<0>(std::declval<_Tuple>()))>,
                   "Attempted construction of reference element binds to a temporary whose lifetime has ended");
   }
+#endif // _LIBCPP_STD_VER >= 23
   return std::__make_from_tuple_impl<_Tp>(
         std::forward<_Tuple>(__t), make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>());
 }

libcxx/test/std/utilities/tuple/tuple.tuple/tuple.apply/make_from_tuple.verify.cpp

@@ -6,10 +6,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-// REQUIRES: std-at-least-c++17
+// REQUIRES: std-at-least-c++23
 
 // No diagnostic gets emitted when we build with modules.
-// XFAIL: (c++17 && clang-modules-build)
+// XFAIL: clang-modules-build
 
 // <tuple>