================
@@ -1130,6 +1137,19 @@ using __best_match_t = typename
invoke_result_t<_MakeOverloads<_Types...>, _Tp,
} // namespace __variant_detail
+template < class _Visitor, class... _Vs, typename =
void_t<decltype(std::__as_variant(std::declval<_Vs>()))...> >
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS constexpr
decltype(auto)
+visit(_Visitor&& __visitor, _Vs&&... __vs);
+
+# if _LIBCPP_STD_VER >= 20
+template < class _Rp,
+ class _Visitor,
+ class... _Vs,
+ typename =
void_t<decltype(std::__as_variant(std::declval<_Vs>()))...> >
----------------
mordante wrote:
```suggestion
typename =
void_t<decltype(std::__as_variant(std::declval<_Vs>()))...>>
```
https://github.com/llvm/llvm-project/pull/76447
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