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-rw-r--r--libcxx/include/variant2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcxx/include/variant b/libcxx/include/variant
index 8505f3262a1..8711ef6eb38 100644
--- a/libcxx/include/variant
+++ b/libcxx/include/variant
@@ -278,7 +278,7 @@ struct _LIBCPP_TEMPLATE_VIS variant_alternative<_Ip, const volatile _Tp>
template <size_t _Ip, class... _Types>
struct _LIBCPP_TEMPLATE_VIS variant_alternative<_Ip, variant<_Types...>> {
- static_assert(_Ip < sizeof...(_Types));
+ static_assert(_Ip < sizeof...(_Types), "Index out of bounds in std::variant_alternative<>");
using type = __type_pack_element<_Ip, _Types...>;
};
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