Index: include/__tuple
===================================================================
--- include/__tuple
+++ include/__tuple
@@ -53,24 +53,24 @@
 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_size<const volatile _Tp> : public tuple_size<_Tp> {};
 #endif
 
-template <size_t _Ip, class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_element;
+template <size_t _Ip, class _Tp> struct _LIBCPP_TEMPLATE_VIS tuple_element;
 
 template <size_t _Ip, class _Tp>
-class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const _Tp>
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const _Tp>
 {
 public:
     typedef typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
 };
 
 template <size_t _Ip, class _Tp>
-class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, volatile _Tp>
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, volatile _Tp>
 {
 public:
     typedef typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
 };
 
 template <size_t _Ip, class _Tp>
-class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const volatile _Tp>
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, const volatile _Tp>
 {
 public:
     typedef typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
@@ -281,7 +281,7 @@
 #endif
 
 template <size_t _Ip, class ..._Types>
-class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, __tuple_types<_Types...>>
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, __tuple_types<_Types...>>
 {
 public:
     static_assert(_Ip < sizeof...(_Types), "tuple_element index out of range");
@@ -456,7 +456,7 @@
 
 
 template <size_t _Ip, class ..._Tp>
-class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, tuple<_Tp...> >
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, tuple<_Tp...> >
 {
 public:
     typedef typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type;
Index: include/array
===================================================================
--- include/array
+++ include/array
@@ -91,7 +91,7 @@
   void swap(array<T,N>& x, array<T,N>& y) noexcept(noexcept(x.swap(y))); // C++17
 
 template <class T> struct tuple_size;
-template <size_t I, class T> class tuple_element;
+template <size_t I, class T> struct tuple_element;
 template <class T, size_t N> struct tuple_size<array<T, N>>;
 template <size_t I, class T, size_t N> struct tuple_element<I, array<T, N>>;
 template <size_t I, class T, size_t N> T& get(array<T, N>&) noexcept; // constexpr in C++14
@@ -433,7 +433,7 @@
     : public integral_constant<size_t, _Size> {};
 
 template <size_t _Ip, class _Tp, size_t _Size>
-class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, array<_Tp, _Size> >
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, array<_Tp, _Size> >
 {
     static_assert(_Ip < _Size, "Index out of bounds in std::tuple_element<> (std::array)");
 public:
Index: include/span
===================================================================
--- include/span
+++ include/span
@@ -531,7 +531,7 @@
 
 
 template <size_t _Ip, class _Tp, size_t _Size>
-class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, span<_Tp, _Size>>
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, span<_Tp, _Size>>
 {
     static_assert( dynamic_extent != _Size, "std::tuple_element<> not supported for std::span<T, dynamic_extent>");
     static_assert(_Ip < _Size, "Index out of bounds in std::tuple_element<> (std::span)");
Index: include/tuple
===================================================================
--- include/tuple
+++ include/tuple
@@ -87,8 +87,8 @@
 template <class... T> struct tuple_size<tuple<T...>>;
 template <class T>
  inline constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17
-template <size_t I, class T> class tuple_element; // undefined
-template <size_t I, class... T> class tuple_element<I, tuple<T...>>;
+template <size_t I, class T> struct tuple_element; // undefined
+template <size_t I, class... T> struct tuple_element<I, tuple<T...>>;
 template <size_t I, class T>
   using tuple_element_t = typename tuple_element <I, T>::type; // C++14
 
Index: include/utility
===================================================================
--- include/utility
+++ include/utility
@@ -103,7 +103,7 @@
 inline constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
 
 template <class T> struct tuple_size;
-template <size_t I, class T> class tuple_element;
+template <size_t I, class T> struct tuple_element;
 
 template <class T1, class T2> struct tuple_size<pair<T1, T2> >;
 template <class T1, class T2> struct tuple_element<0, pair<T1, T2> >;
@@ -687,20 +687,20 @@
     : public integral_constant<size_t, 2> {};
 
 template <size_t _Ip, class _T1, class _T2>
-class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, pair<_T1, _T2> >
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, pair<_T1, _T2> >
 {
     static_assert(_Ip < 2, "Index out of bounds in std::tuple_element<std::pair<T1, T2>>");
 };
 
 template <class _T1, class _T2>
-class _LIBCPP_TEMPLATE_VIS tuple_element<0, pair<_T1, _T2> >
+struct _LIBCPP_TEMPLATE_VIS tuple_element<0, pair<_T1, _T2> >
 {
 public:
     typedef _T1 type;
 };
 
 template <class _T1, class _T2>
-class _LIBCPP_TEMPLATE_VIS tuple_element<1, pair<_T1, _T2> >
+struct _LIBCPP_TEMPLATE_VIS tuple_element<1, pair<_T1, _T2> >
 {
 public:
     typedef _T2 type;
Index: test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.array.pass.cpp
===================================================================
--- test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.array.pass.cpp
+++ test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple.include.array.pass.cpp
@@ -11,7 +11,7 @@
 // template <class... Types> class tuple;
 
 // template <size_t I, class... Types>
-// class tuple_element<I, tuple<Types...> >
+// struct tuple_element<I, tuple<Types...> >
 // {
 // public:
 //     typedef Ti type;
Index: test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.fail.cpp
===================================================================
--- test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.fail.cpp
+++ test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.fail.cpp
@@ -11,7 +11,7 @@
 // template <class... Types> class tuple;
 
 // template <size_t I, class... Types>
-// class tuple_element<I, tuple<Types...> >
+// struct tuple_element<I, tuple<Types...> >
 // {
 // public:
 //     typedef Ti type;
Index: test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.pass.cpp
===================================================================
--- test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.pass.cpp
+++ test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_element.pass.cpp
@@ -11,7 +11,7 @@
 // template <class... Types> class tuple;
 
 // template <size_t I, class... Types>
-// class tuple_element<I, tuple<Types...> >
+// struct tuple_element<I, tuple<Types...> >
 // {
 // public:
 //     typedef Ti type;
Index: test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_structured_bindings.pass.cpp
===================================================================
--- test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_structured_bindings.pass.cpp
+++ test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_structured_bindings.pass.cpp
@@ -116,7 +116,7 @@
 int get(Test const&) { static_assert(N == 0, ""); return -1; }
 
 template <>
-class std::tuple_element<0, Test> {
+struct std::tuple_element<0, Test> {
 public:
   typedef int type;
 };