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-rw-r--r--include/tuple2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/tuple b/include/tuple
index 553d8e546f89..2f71cce74139 100644
--- a/include/tuple
+++ b/include/tuple
@@ -84,7 +84,7 @@ template <class T, class Tuple>
constexpr T make_from_tuple(Tuple&& t); // C++17
// 20.4.1.4, tuple helper classes:
-template <class T> class tuple_size;
+template <class T> class tuple_size; // undefined
template <class... T> class tuple_size<tuple<T...>>;
template <class T>
constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17