Index: test/std/iterators/stream.iterators/istream.iterator/types.pass.cpp
===================================================================
--- test/std/iterators/stream.iterators/istream.iterator/types.pass.cpp
+++ test/std/iterators/stream.iterators/istream.iterator/types.pass.cpp
@@ -43,9 +43,17 @@
 int main()
 {
     typedef std::istream_iterator<double> I1; // double is trivially destructible
+#if TEST_STD_VER <= 14
     static_assert((std::is_convertible<I1,
         std::iterator<std::input_iterator_tag, double, std::ptrdiff_t,
         const double*, const double&> >::value), "");
+#else
+    static_assert((std::is_same<I1::iterator_category, std::input_iterator_tag>::value), "");
+    static_assert((std::is_same<I1::value_type, double>::value), "");
+    static_assert((std::is_same<I1::difference_type, std::ptrdiff_t>::value), "");
+    static_assert((std::is_same<I1::pointer, const double*>::value), "");
+    static_assert((std::is_same<I1::reference, const double&>::value), "");
+#endif
     static_assert((std::is_same<I1::char_type, char>::value), "");
     static_assert((std::is_same<I1::traits_type, std::char_traits<char> >::value), "");
     static_assert((std::is_same<I1::istream_type, std::istream>::value), "");
@@ -53,9 +61,17 @@
     static_assert( std::is_trivially_destructible<I1>::value, "");
 
     typedef std::istream_iterator<unsigned, wchar_t> I2; // unsigned is trivially destructible
+#if TEST_STD_VER <= 14
     static_assert((std::is_convertible<I2,
         std::iterator<std::input_iterator_tag, unsigned, std::ptrdiff_t,
         const unsigned*, const unsigned&> >::value), "");
+#else
+    static_assert((std::is_same<I2::iterator_category, std::input_iterator_tag>::value), "");
+    static_assert((std::is_same<I2::value_type, unsigned>::value), "");
+    static_assert((std::is_same<I2::difference_type, std::ptrdiff_t>::value), "");
+    static_assert((std::is_same<I2::pointer, const unsigned*>::value), "");
+    static_assert((std::is_same<I2::reference, const unsigned&>::value), "");
+#endif
     static_assert((std::is_same<I2::char_type, wchar_t>::value), "");
     static_assert((std::is_same<I2::traits_type, std::char_traits<wchar_t> >::value), "");
     static_assert((std::is_same<I2::istream_type, std::wistream>::value), "");
Index: test/std/iterators/stream.iterators/ostream.iterator/types.pass.cpp
===================================================================
--- test/std/iterators/stream.iterators/ostream.iterator/types.pass.cpp
+++ test/std/iterators/stream.iterators/ostream.iterator/types.pass.cpp
@@ -26,14 +26,30 @@
 int main()
 {
     typedef std::ostream_iterator<double> I1;
+#if TEST_STD_VER <= 14
     static_assert((std::is_convertible<I1,
         std::iterator<std::output_iterator_tag, void, void, void, void> >::value), "");
+#else
+    static_assert((std::is_same<I1::iterator_category, std::output_iterator_tag>::value), "");
+    static_assert((std::is_same<I1::value_type, void>::value), "");
+    static_assert((std::is_same<I1::difference_type, void>::value), "");
+    static_assert((std::is_same<I1::pointer, void>::value), "");
+    static_assert((std::is_same<I1::reference, void>::value), "");
+#endif
     static_assert((std::is_same<I1::char_type, char>::value), "");
     static_assert((std::is_same<I1::traits_type, std::char_traits<char> >::value), "");
     static_assert((std::is_same<I1::ostream_type, std::ostream>::value), "");
     typedef std::ostream_iterator<unsigned, wchar_t> I2;
+#if TEST_STD_VER <= 14
     static_assert((std::is_convertible<I2,
         std::iterator<std::output_iterator_tag, void, void, void, void> >::value), "");
+#else
+    static_assert((std::is_same<I2::iterator_category, std::output_iterator_tag>::value), "");
+    static_assert((std::is_same<I2::value_type, void>::value), "");
+    static_assert((std::is_same<I2::difference_type, void>::value), "");
+    static_assert((std::is_same<I2::pointer, void>::value), "");
+    static_assert((std::is_same<I2::reference, void>::value), "");
+#endif
     static_assert((std::is_same<I2::char_type, wchar_t>::value), "");
     static_assert((std::is_same<I2::traits_type, std::char_traits<wchar_t> >::value), "");
     static_assert((std::is_same<I2::ostream_type, std::wostream>::value), "");
Index: test/std/iterators/stream.iterators/ostreambuf.iterator/types.pass.cpp
===================================================================
--- test/std/iterators/stream.iterators/ostreambuf.iterator/types.pass.cpp
+++ test/std/iterators/stream.iterators/ostreambuf.iterator/types.pass.cpp
@@ -27,16 +27,32 @@
 int main()
 {
     typedef std::ostreambuf_iterator<char> I1;
+#if TEST_STD_VER <= 14
     static_assert((std::is_convertible<I1,
         std::iterator<std::output_iterator_tag, void, void, void, void> >::value), "");
+#else
+    static_assert((std::is_same<I1::iterator_category, std::output_iterator_tag>::value), "");
+    static_assert((std::is_same<I1::value_type, void>::value), "");
+    static_assert((std::is_same<I1::difference_type, void>::value), "");
+    static_assert((std::is_same<I1::pointer, void>::value), "");
+    static_assert((std::is_same<I1::reference, void>::value), "");
+#endif
     static_assert((std::is_same<I1::char_type, char>::value), "");
     static_assert((std::is_same<I1::traits_type, std::char_traits<char> >::value), "");
     static_assert((std::is_same<I1::streambuf_type, std::streambuf>::value), "");
     static_assert((std::is_same<I1::ostream_type, std::ostream>::value), "");
 
     typedef std::ostreambuf_iterator<wchar_t> I2;
+#if TEST_STD_VER <= 14
     static_assert((std::is_convertible<I2,
         std::iterator<std::output_iterator_tag, void, void, void, void> >::value), "");
+#else
+    static_assert((std::is_same<I2::iterator_category, std::output_iterator_tag>::value), "");
+    static_assert((std::is_same<I2::value_type, void>::value), "");
+    static_assert((std::is_same<I2::difference_type, void>::value), "");
+    static_assert((std::is_same<I2::pointer, void>::value), "");
+    static_assert((std::is_same<I2::reference, void>::value), "");
+#endif
     static_assert((std::is_same<I2::char_type, wchar_t>::value), "");
     static_assert((std::is_same<I2::traits_type, std::char_traits<wchar_t> >::value), "");
     static_assert((std::is_same<I2::streambuf_type, std::wstreambuf>::value), "");