diff --git a/libcxx/include/__algorithm/copy.h b/libcxx/include/__algorithm/copy.h
--- a/libcxx/include/__algorithm/copy.h
+++ b/libcxx/include/__algorithm/copy.h
@@ -14,10 +14,15 @@
 #include <__config>
 #include <__iterator/iterator_traits.h>
 #include <__iterator/reverse_iterator.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_copy_constructible.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/is_trivially_copy_assignable.h>
+#include <__type_traits/is_trivially_copyable.h>
+#include <__type_traits/remove_const.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
 #include <cstring>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__algorithm/iterator_operations.h b/libcxx/include/__algorithm/iterator_operations.h
--- a/libcxx/include/__algorithm/iterator_operations.h
+++ b/libcxx/include/__algorithm/iterator_operations.h
@@ -21,10 +21,13 @@
 #include <__iterator/next.h>
 #include <__iterator/prev.h>
 #include <__iterator/readable_traits.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/remove_cvref.h>
 #include <__utility/declval.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__algorithm/move.h b/libcxx/include/__algorithm/move.h
--- a/libcxx/include/__algorithm/move.h
+++ b/libcxx/include/__algorithm/move.h
@@ -14,10 +14,14 @@
 #include <__config>
 #include <__iterator/iterator_traits.h>
 #include <__iterator/reverse_iterator.h>
+#include <__type_traits/is_constant_evaluated.h>
+#include <__type_traits/is_copy_constructible.h>
+#include <__type_traits/is_trivially_copyable.h>
+#include <__type_traits/is_trivially_move_assignable.h>
+#include <__type_traits/remove_const.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
 #include <cstring>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__algorithm/ranges_iterator_concept.h b/libcxx/include/__algorithm/ranges_iterator_concept.h
--- a/libcxx/include/__algorithm/ranges_iterator_concept.h
+++ b/libcxx/include/__algorithm/ranges_iterator_concept.h
@@ -12,7 +12,7 @@
 #include <__config>
 #include <__iterator/concepts.h>
 #include <__iterator/iterator_traits.h>
-#include <type_traits>
+#include <__type_traits/remove_cvref.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__algorithm/unwrap_iter.h b/libcxx/include/__algorithm/unwrap_iter.h
--- a/libcxx/include/__algorithm/unwrap_iter.h
+++ b/libcxx/include/__algorithm/unwrap_iter.h
@@ -12,8 +12,10 @@
 #include <__config>
 #include <__iterator/iterator_traits.h>
 #include <__memory/pointer_traits.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_copy_constructible.h>
+#include <__utility/declval.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__bit/bit_cast.h b/libcxx/include/__bit/bit_cast.h
--- a/libcxx/include/__bit/bit_cast.h
+++ b/libcxx/include/__bit/bit_cast.h
@@ -11,7 +11,7 @@
 #define _LIBCPP___BIT_BIT_CAST_H
 
 #include <__config>
-#include <type_traits>
+#include <__type_traits/is_trivially_copyable.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__compare/compare_partial_order_fallback.h b/libcxx/include/__compare/compare_partial_order_fallback.h
--- a/libcxx/include/__compare/compare_partial_order_fallback.h
+++ b/libcxx/include/__compare/compare_partial_order_fallback.h
@@ -12,9 +12,10 @@
 #include <__compare/ordering.h>
 #include <__compare/partial_order.h>
 #include <__config>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_same.h>
 #include <__utility/forward.h>
 #include <__utility/priority_tag.h>
-#include <type_traits>
 
 #ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
 #  pragma GCC system_header
diff --git a/libcxx/include/__compare/compare_strong_order_fallback.h b/libcxx/include/__compare/compare_strong_order_fallback.h
--- a/libcxx/include/__compare/compare_strong_order_fallback.h
+++ b/libcxx/include/__compare/compare_strong_order_fallback.h
@@ -12,9 +12,10 @@
 #include <__compare/ordering.h>
 #include <__compare/strong_order.h>
 #include <__config>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_same.h>
 #include <__utility/forward.h>
 #include <__utility/priority_tag.h>
-#include <type_traits>
 
 #ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
 #  pragma GCC system_header
diff --git a/libcxx/include/__compare/compare_three_way_result.h b/libcxx/include/__compare/compare_three_way_result.h
--- a/libcxx/include/__compare/compare_three_way_result.h
+++ b/libcxx/include/__compare/compare_three_way_result.h
@@ -11,7 +11,7 @@
 
 #include <__config>
 #include <__type_traits/make_const_lvalue_ref.h>
-#include <type_traits>
+#include <__utility/declval.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__compare/compare_weak_order_fallback.h b/libcxx/include/__compare/compare_weak_order_fallback.h
--- a/libcxx/include/__compare/compare_weak_order_fallback.h
+++ b/libcxx/include/__compare/compare_weak_order_fallback.h
@@ -12,9 +12,10 @@
 #include <__compare/ordering.h>
 #include <__compare/weak_order.h>
 #include <__config>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_same.h>
 #include <__utility/forward.h>
 #include <__utility/priority_tag.h>
-#include <type_traits>
 
 #ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
 #  pragma GCC system_header
diff --git a/libcxx/include/__compare/partial_order.h b/libcxx/include/__compare/partial_order.h
--- a/libcxx/include/__compare/partial_order.h
+++ b/libcxx/include/__compare/partial_order.h
@@ -13,9 +13,10 @@
 #include <__compare/ordering.h>
 #include <__compare/weak_order.h>
 #include <__config>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_same.h>
 #include <__utility/forward.h>
 #include <__utility/priority_tag.h>
-#include <type_traits>
 
 #ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
 #  pragma GCC system_header
diff --git a/libcxx/include/__compare/strong_order.h b/libcxx/include/__compare/strong_order.h
--- a/libcxx/include/__compare/strong_order.h
+++ b/libcxx/include/__compare/strong_order.h
@@ -13,12 +13,13 @@
 #include <__compare/compare_three_way.h>
 #include <__compare/ordering.h>
 #include <__config>
+#include <__type_traits/conditional.h>
+#include <__type_traits/decay.h>
 #include <__utility/forward.h>
 #include <__utility/priority_tag.h>
 #include <cmath>
 #include <cstdint>
 #include <limits>
-#include <type_traits>
 
 #ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
 #  pragma GCC system_header
diff --git a/libcxx/include/__compare/weak_order.h b/libcxx/include/__compare/weak_order.h
--- a/libcxx/include/__compare/weak_order.h
+++ b/libcxx/include/__compare/weak_order.h
@@ -13,10 +13,10 @@
 #include <__compare/ordering.h>
 #include <__compare/strong_order.h>
 #include <__config>
+#include <__type_traits/decay.h>
 #include <__utility/forward.h>
 #include <__utility/priority_tag.h>
 #include <cmath>
-#include <type_traits>
 
 #ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
 #  pragma GCC system_header
diff --git a/libcxx/include/__functional/hash.h b/libcxx/include/__functional/hash.h
--- a/libcxx/include/__functional/hash.h
+++ b/libcxx/include/__functional/hash.h
@@ -10,9 +10,15 @@
 #define _LIBCPP___FUNCTIONAL_HASH_H
 
 #include <__config>
+#include <__functional/invoke.h>
 #include <__functional/unary_function.h>
 #include <__fwd/hash.h>
 #include <__tuple_dir/sfinae_helpers.h>
+#include <__type_traits/is_copy_constructible.h>
+#include <__type_traits/is_default_constructible.h>
+#include <__type_traits/is_enum.h>
+#include <__type_traits/is_move_constructible.h>
+#include <__type_traits/underlying_type.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
@@ -21,7 +27,6 @@
 #include <cstdint>
 #include <cstring>
 #include <limits>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__functional/reference_wrapper.h b/libcxx/include/__functional/reference_wrapper.h
--- a/libcxx/include/__functional/reference_wrapper.h
+++ b/libcxx/include/__functional/reference_wrapper.h
@@ -11,10 +11,13 @@
 #define _LIBCPP___FUNCTIONAL_REFERENCE_WRAPPER_H
 
 #include <__config>
+#include <__functional/invoke.h>
 #include <__functional/weak_result_type.h>
 #include <__memory/addressof.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/remove_cvref.h>
+#include <__utility/declval.h>
 #include <__utility/forward.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__functional/weak_result_type.h b/libcxx/include/__functional/weak_result_type.h
--- a/libcxx/include/__functional/weak_result_type.h
+++ b/libcxx/include/__functional/weak_result_type.h
@@ -12,8 +12,11 @@
 
 #include <__config>
 #include <__functional/binary_function.h>
+#include <__functional/invoke.h>
 #include <__functional/unary_function.h>
-#include <type_traits>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/is_same.h>
+#include <__utility/declval.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__iterator/advance.h b/libcxx/include/__iterator/advance.h
--- a/libcxx/include/__iterator/advance.h
+++ b/libcxx/include/__iterator/advance.h
@@ -17,12 +17,14 @@
 #include <__iterator/concepts.h>
 #include <__iterator/incrementable_traits.h>
 #include <__iterator/iterator_traits.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_integral.h>
 #include <__utility/convert_to_integral.h>
+#include <__utility/declval.h>
 #include <__utility/move.h>
 #include <__utility/unreachable.h>
 #include <cstdlib>
 #include <limits>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__iterator/concepts.h b/libcxx/include/__iterator/concepts.h
--- a/libcxx/include/__iterator/concepts.h
+++ b/libcxx/include/__iterator/concepts.h
@@ -26,13 +26,19 @@
 #include <__concepts/semiregular.h>
 #include <__concepts/totally_ordered.h>
 #include <__config>
+#include <__functional/invoke.h>
 #include <__iterator/incrementable_traits.h>
 #include <__iterator/iter_move.h>
 #include <__iterator/iterator_traits.h>
 #include <__iterator/readable_traits.h>
 #include <__memory/pointer_traits.h>
+#include <__type_traits/add_pointer.h>
+#include <__type_traits/common_reference.h>
+#include <__type_traits/is_pointer.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/remove_cv.h>
+#include <__type_traits/remove_cvref.h>
 #include <__utility/forward.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__iterator/distance.h b/libcxx/include/__iterator/distance.h
--- a/libcxx/include/__iterator/distance.h
+++ b/libcxx/include/__iterator/distance.h
@@ -17,7 +17,8 @@
 #include <__ranges/access.h>
 #include <__ranges/concepts.h>
 #include <__ranges/size.h>
-#include <type_traits>
+#include <__type_traits/decay.h>
+#include <__type_traits/remove_cvref.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__iterator/incrementable_traits.h b/libcxx/include/__iterator/incrementable_traits.h
--- a/libcxx/include/__iterator/incrementable_traits.h
+++ b/libcxx/include/__iterator/incrementable_traits.h
@@ -12,9 +12,13 @@
 
 #include <__concepts/arithmetic.h>
 #include <__config>
+#include <__type_traits/conditional.h>
+#include <__type_traits/is_object.h>
 #include <__type_traits/is_primary_template.h>
+#include <__type_traits/make_signed.h>
+#include <__type_traits/remove_cvref.h>
+#include <__utility/declval.h>
 #include <cstddef>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__iterator/iter_move.h b/libcxx/include/__iterator/iter_move.h
--- a/libcxx/include/__iterator/iter_move.h
+++ b/libcxx/include/__iterator/iter_move.h
@@ -13,9 +13,11 @@
 #include <__concepts/class_or_enum.h>
 #include <__config>
 #include <__iterator/iterator_traits.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/remove_cvref.h>
+#include <__utility/declval.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__iterator/iter_swap.h b/libcxx/include/__iterator/iter_swap.h
--- a/libcxx/include/__iterator/iter_swap.h
+++ b/libcxx/include/__iterator/iter_swap.h
@@ -17,9 +17,10 @@
 #include <__iterator/iter_move.h>
 #include <__iterator/iterator_traits.h>
 #include <__iterator/readable_traits.h>
+#include <__type_traits/remove_cvref.h>
+#include <__utility/declval.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__iterator/iterator_traits.h b/libcxx/include/__iterator/iterator_traits.h
--- a/libcxx/include/__iterator/iterator_traits.h
+++ b/libcxx/include/__iterator/iterator_traits.h
@@ -21,8 +21,21 @@
 #include <__fwd/pair.h>
 #include <__iterator/incrementable_traits.h>
 #include <__iterator/readable_traits.h>
+#include <__type_traits/add_const.h>
+#include <__type_traits/common_reference.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/disjunction.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/is_object.h>
+#include <__type_traits/is_primary_template.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/is_valid_expansion.h>
+#include <__type_traits/remove_const.h>
+#include <__type_traits/remove_cv.h>
+#include <__type_traits/remove_cvref.h>
+#include <__type_traits/void_t.h>
+#include <__utility/declval.h>
 #include <cstddef>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__iterator/next.h b/libcxx/include/__iterator/next.h
--- a/libcxx/include/__iterator/next.h
+++ b/libcxx/include/__iterator/next.h
@@ -16,7 +16,7 @@
 #include <__iterator/concepts.h>
 #include <__iterator/incrementable_traits.h>
 #include <__iterator/iterator_traits.h>
-#include <type_traits>
+#include <__type_traits/enable_if.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__iterator/prev.h b/libcxx/include/__iterator/prev.h
--- a/libcxx/include/__iterator/prev.h
+++ b/libcxx/include/__iterator/prev.h
@@ -16,7 +16,7 @@
 #include <__iterator/concepts.h>
 #include <__iterator/incrementable_traits.h>
 #include <__iterator/iterator_traits.h>
-#include <type_traits>
+#include <__type_traits/enable_if.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__iterator/readable_traits.h b/libcxx/include/__iterator/readable_traits.h
--- a/libcxx/include/__iterator/readable_traits.h
+++ b/libcxx/include/__iterator/readable_traits.h
@@ -12,7 +12,13 @@
 
 #include <__concepts/same_as.h>
 #include <__config>
-#include <type_traits>
+#include <__type_traits/conditional.h>
+#include <__type_traits/is_array.h>
+#include <__type_traits/is_object.h>
+#include <__type_traits/is_primary_template.h>
+#include <__type_traits/remove_cv.h>
+#include <__type_traits/remove_cvref.h>
+#include <__type_traits/remove_extent.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__iterator/reverse_iterator.h b/libcxx/include/__iterator/reverse_iterator.h
--- a/libcxx/include/__iterator/reverse_iterator.h
+++ b/libcxx/include/__iterator/reverse_iterator.h
@@ -29,8 +29,15 @@
 #include <__ranges/access.h>
 #include <__ranges/concepts.h>
 #include <__ranges/subrange.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_assignable.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/is_nothrow_copy_constructible.h>
+#include <__type_traits/is_pointer.h>
+#include <__type_traits/is_same.h>
+#include <__utility/declval.h>
 #include <__utility/move.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__memory/allocator.h b/libcxx/include/__memory/allocator.h
--- a/libcxx/include/__memory/allocator.h
+++ b/libcxx/include/__memory/allocator.h
@@ -13,11 +13,14 @@
 #include <__config>
 #include <__memory/allocate_at_least.h>
 #include <__memory/allocator_traits.h>
+#include <__type_traits/is_constant_evaluated.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/is_void.h>
+#include <__type_traits/is_volatile.h>
 #include <__utility/forward.h>
 #include <cstddef>
 #include <new>
 #include <stdexcept>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__memory/allocator_arg_t.h b/libcxx/include/__memory/allocator_arg_t.h
--- a/libcxx/include/__memory/allocator_arg_t.h
+++ b/libcxx/include/__memory/allocator_arg_t.h
@@ -12,8 +12,10 @@
 
 #include <__config>
 #include <__memory/uses_allocator.h>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/is_constructible.h>
+#include <__type_traits/remove_cvref.h>
 #include <__utility/forward.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__memory/allocator_traits.h b/libcxx/include/__memory/allocator_traits.h
--- a/libcxx/include/__memory/allocator_traits.h
+++ b/libcxx/include/__memory/allocator_traits.h
@@ -13,9 +13,15 @@
 #include <__config>
 #include <__memory/construct_at.h>
 #include <__memory/pointer_traits.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_copy_constructible.h>
+#include <__type_traits/is_empty.h>
+#include <__type_traits/is_move_constructible.h>
+#include <__type_traits/make_unsigned.h>
+#include <__type_traits/remove_reference.h>
+#include <__type_traits/void_t.h>
 #include <__utility/forward.h>
 #include <limits>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__memory/assume_aligned.h b/libcxx/include/__memory/assume_aligned.h
--- a/libcxx/include/__memory/assume_aligned.h
+++ b/libcxx/include/__memory/assume_aligned.h
@@ -12,9 +12,9 @@
 
 #include <__assert>
 #include <__config>
+#include <__type_traits/is_constant_evaluated.h>
 #include <cstddef>
 #include <cstdint>
-#include <type_traits> // for is_constant_evaluated()
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__memory/compressed_pair.h b/libcxx/include/__memory/compressed_pair.h
--- a/libcxx/include/__memory/compressed_pair.h
+++ b/libcxx/include/__memory/compressed_pair.h
@@ -14,11 +14,18 @@
 #include <__fwd/get.h>
 #include <__fwd/tuple.h>
 #include <__tuple_dir/tuple_indices.h>
+#include <__type_traits/decay.h>
 #include <__type_traits/dependent_type.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_default_constructible.h>
+#include <__type_traits/is_empty.h>
+#include <__type_traits/is_final.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/is_swappable.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/piecewise_construct.h>
-#include <type_traits>
+#include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__memory/concepts.h b/libcxx/include/__memory/concepts.h
--- a/libcxx/include/__memory/concepts.h
+++ b/libcxx/include/__memory/concepts.h
@@ -17,7 +17,8 @@
 #include <__iterator/readable_traits.h>
 #include <__ranges/access.h>
 #include <__ranges/concepts.h>
-#include <type_traits>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/remove_cvref.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__memory/construct_at.h b/libcxx/include/__memory/construct_at.h
--- a/libcxx/include/__memory/construct_at.h
+++ b/libcxx/include/__memory/construct_at.h
@@ -15,10 +15,12 @@
 #include <__iterator/access.h>
 #include <__memory/addressof.h>
 #include <__memory/voidify.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_array.h>
+#include <__utility/declval.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <new>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__memory/pointer_traits.h b/libcxx/include/__memory/pointer_traits.h
--- a/libcxx/include/__memory/pointer_traits.h
+++ b/libcxx/include/__memory/pointer_traits.h
@@ -12,8 +12,15 @@
 
 #include <__config>
 #include <__memory/addressof.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/conjunction.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_class.h>
+#include <__type_traits/is_function.h>
+#include <__type_traits/is_void.h>
+#include <__type_traits/void_t.h>
+#include <__utility/declval.h>
 #include <cstddef>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__memory/ranges_uninitialized_algorithms.h b/libcxx/include/__memory/ranges_uninitialized_algorithms.h
--- a/libcxx/include/__memory/ranges_uninitialized_algorithms.h
+++ b/libcxx/include/__memory/ranges_uninitialized_algorithms.h
@@ -23,9 +23,9 @@
 #include <__ranges/access.h>
 #include <__ranges/concepts.h>
 #include <__ranges/dangling.h>
+#include <__type_traits/remove_reference.h>
 #include <__utility/move.h>
 #include <new>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__memory/shared_ptr.h b/libcxx/include/__memory/shared_ptr.h
--- a/libcxx/include/__memory/shared_ptr.h
+++ b/libcxx/include/__memory/shared_ptr.h
@@ -37,7 +37,6 @@
 #include <iosfwd>
 #include <new>
 #include <stdexcept>
-#include <type_traits>
 #include <typeinfo>
 #if !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER)
 #  include <atomic>
diff --git a/libcxx/include/__memory/uninitialized_algorithms.h b/libcxx/include/__memory/uninitialized_algorithms.h
--- a/libcxx/include/__memory/uninitialized_algorithms.h
+++ b/libcxx/include/__memory/uninitialized_algorithms.h
@@ -20,12 +20,21 @@
 #include <__memory/construct_at.h>
 #include <__memory/pointer_traits.h>
 #include <__memory/voidify.h>
+#include <__type_traits/extent.h>
+#include <__type_traits/is_array.h>
 #include <__type_traits/is_constant_evaluated.h>
+#include <__type_traits/is_trivially_copy_assignable.h>
+#include <__type_traits/is_trivially_copy_constructible.h>
+#include <__type_traits/is_trivially_move_assignable.h>
+#include <__type_traits/is_trivially_move_constructible.h>
+#include <__type_traits/is_unbounded_array.h>
+#include <__type_traits/negation.h>
+#include <__type_traits/remove_const.h>
+#include <__type_traits/remove_extent.h>
 #include <__utility/move.h>
 #include <__utility/pair.h>
 #include <__utility/transaction.h>
 #include <new>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__memory/unique_ptr.h b/libcxx/include/__memory/unique_ptr.h
--- a/libcxx/include/__memory/unique_ptr.h
+++ b/libcxx/include/__memory/unique_ptr.h
@@ -19,10 +19,26 @@
 #include <__memory/allocator_traits.h> // __pointer
 #include <__memory/auto_ptr.h>
 #include <__memory/compressed_pair.h>
+#include <__type_traits/add_lvalue_reference.h>
+#include <__type_traits/common_type.h>
+#include <__type_traits/dependent_type.h>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/is_array.h>
+#include <__type_traits/is_assignable.h>
+#include <__type_traits/is_constructible.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/is_default_constructible.h>
+#include <__type_traits/is_function.h>
+#include <__type_traits/is_pointer.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/is_swappable.h>
+#include <__type_traits/is_void.h>
+#include <__type_traits/remove_extent.h>
+#include <__type_traits/type_identity.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <cstddef>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__memory/uses_allocator.h b/libcxx/include/__memory/uses_allocator.h
--- a/libcxx/include/__memory/uses_allocator.h
+++ b/libcxx/include/__memory/uses_allocator.h
@@ -11,8 +11,8 @@
 #define _LIBCPP___MEMORY_USES_ALLOCATOR_H
 
 #include <__config>
+#include <__type_traits/is_convertible.h>
 #include <cstddef>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__ranges/access.h b/libcxx/include/__ranges/access.h
--- a/libcxx/include/__ranges/access.h
+++ b/libcxx/include/__ranges/access.h
@@ -15,8 +15,13 @@
 #include <__iterator/concepts.h>
 #include <__iterator/readable_traits.h>
 #include <__ranges/enable_borrowed_range.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/remove_cvref.h>
+#include <__type_traits/remove_reference.h>
 #include <__utility/auto_cast.h>
-#include <type_traits>
+#include <__utility/declval.h>
+#include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__ranges/concepts.h b/libcxx/include/__ranges/concepts.h
--- a/libcxx/include/__ranges/concepts.h
+++ b/libcxx/include/__ranges/concepts.h
@@ -24,8 +24,12 @@
 #include <__ranges/enable_borrowed_range.h>
 #include <__ranges/enable_view.h>
 #include <__ranges/size.h>
+#include <__type_traits/add_pointer.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/remove_cvref.h>
+#include <__type_traits/remove_reference.h>
+#include <__utility/declval.h>
 #include <initializer_list>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__ranges/dangling.h b/libcxx/include/__ranges/dangling.h
--- a/libcxx/include/__ranges/dangling.h
+++ b/libcxx/include/__ranges/dangling.h
@@ -13,7 +13,7 @@
 #include <__config>
 #include <__ranges/access.h>
 #include <__ranges/concepts.h>
-#include <type_traits>
+#include <__type_traits/conditional.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__ranges/data.h b/libcxx/include/__ranges/data.h
--- a/libcxx/include/__ranges/data.h
+++ b/libcxx/include/__ranges/data.h
@@ -16,8 +16,13 @@
 #include <__iterator/iterator_traits.h>
 #include <__memory/pointer_traits.h>
 #include <__ranges/access.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_object.h>
+#include <__type_traits/is_pointer.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/remove_pointer.h>
+#include <__type_traits/remove_reference.h>
 #include <__utility/auto_cast.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__ranges/empty.h b/libcxx/include/__ranges/empty.h
--- a/libcxx/include/__ranges/empty.h
+++ b/libcxx/include/__ranges/empty.h
@@ -15,7 +15,6 @@
 #include <__iterator/concepts.h>
 #include <__ranges/access.h>
 #include <__ranges/size.h>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__ranges/enable_view.h b/libcxx/include/__ranges/enable_view.h
--- a/libcxx/include/__ranges/enable_view.h
+++ b/libcxx/include/__ranges/enable_view.h
@@ -13,7 +13,9 @@
 #include <__concepts/derived_from.h>
 #include <__concepts/same_as.h>
 #include <__config>
-#include <type_traits>
+#include <__type_traits/is_class.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/remove_cv.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__ranges/size.h b/libcxx/include/__ranges/size.h
--- a/libcxx/include/__ranges/size.h
+++ b/libcxx/include/__ranges/size.h
@@ -16,9 +16,12 @@
 #include <__iterator/concepts.h>
 #include <__iterator/iterator_traits.h>
 #include <__ranges/access.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/make_signed.h>
+#include <__type_traits/make_unsigned.h>
+#include <__type_traits/remove_cvref.h>
 #include <__utility/auto_cast.h>
 #include <cstddef>
-#include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__ranges/subrange.h b/libcxx/include/__ranges/subrange.h
--- a/libcxx/include/__ranges/subrange.h
+++ b/libcxx/include/__ranges/subrange.h
@@ -30,8 +30,15 @@
 #include <__ranges/view_interface.h>
 #include <__tuple_dir/tuple_element.h>
 #include <__tuple_dir/tuple_size.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_pointer.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/make_unsigned.h>
+#include <__type_traits/remove_const.h>
+#include <__type_traits/remove_pointer.h>
 #include <__utility/move.h>
-#include <type_traits>
+#include <cstddef>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__ranges/view_interface.h b/libcxx/include/__ranges/view_interface.h
--- a/libcxx/include/__ranges/view_interface.h
+++ b/libcxx/include/__ranges/view_interface.h
@@ -21,7 +21,9 @@
 #include <__ranges/access.h>
 #include <__ranges/concepts.h>
 #include <__ranges/empty.h>
-#include <type_traits>
+#include <__type_traits/is_class.h>
+#include <__type_traits/make_unsigned.h>
+#include <__type_traits/remove_cv.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/__type_traits/is_trivially_destructible.h b/libcxx/include/__type_traits/is_trivially_destructible.h
--- a/libcxx/include/__type_traits/is_trivially_destructible.h
+++ b/libcxx/include/__type_traits/is_trivially_destructible.h
@@ -11,6 +11,7 @@
 
 #include <__config>
 #include <__type_traits/integral_constant.h>
+#include <__type_traits/is_destructible.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
diff --git a/libcxx/include/cmath b/libcxx/include/cmath
--- a/libcxx/include/cmath
+++ b/libcxx/include/cmath
@@ -306,7 +306,11 @@
 
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__config>
-#include <type_traits>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_arithmetic.h>
+#include <__type_traits/is_floating_point.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/remove_cv.h>
 #include <version>
 
 #include <math.h>
@@ -669,4 +673,8 @@
 
 _LIBCPP_POP_MACROS
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <type_traits>
+#endif
+
 #endif // _LIBCPP_CMATH
diff --git a/libcxx/include/compare b/libcxx/include/compare
--- a/libcxx/include/compare
+++ b/libcxx/include/compare
@@ -160,4 +160,8 @@
 #  pragma GCC system_header
 #endif
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <type_traits>
+#endif
+
 #endif // _LIBCPP_COMPARE
diff --git a/libcxx/include/condition_variable b/libcxx/include/condition_variable
--- a/libcxx/include/condition_variable
+++ b/libcxx/include/condition_variable
@@ -270,6 +270,7 @@
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_CONDITION_VARIABLE
diff --git a/libcxx/include/exception b/libcxx/include/exception
--- a/libcxx/include/exception
+++ b/libcxx/include/exception
@@ -80,9 +80,15 @@
 #include <__availability>
 #include <__config>
 #include <__memory/addressof.h>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_base_of.h>
+#include <__type_traits/is_class.h>
+#include <__type_traits/is_convertible.h>
+#include <__type_traits/is_copy_constructible.h>
+#include <__type_traits/is_final.h>
+#include <__type_traits/is_polymorphic.h>
 #include <cstddef>
 #include <cstdlib>
-#include <type_traits>
 #include <version>
 
 // <vcruntime_exception.h> defines its own std::exception and std::bad_exception types,
@@ -371,4 +377,8 @@
 
 } // namespace std
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <type_traits>
+#endif
+
 #endif // _LIBCPP_EXCEPTION
diff --git a/libcxx/include/istream b/libcxx/include/istream
--- a/libcxx/include/istream
+++ b/libcxx/include/istream
@@ -1639,6 +1639,7 @@
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
+#  include <type_traits>
 #endif
 
 _LIBCPP_POP_MACROS
diff --git a/libcxx/include/math.h b/libcxx/include/math.h
--- a/libcxx/include/math.h
+++ b/libcxx/include/math.h
@@ -307,10 +307,13 @@
 // back to C++ linkage before including these C++ headers.
 extern "C++" {
 
+#include <__type_traits/enable_if.h>
+#include <__type_traits/is_floating_point.h>
+#include <__type_traits/is_integral.h>
+#include <__type_traits/is_same.h>
 #include <__type_traits/promote.h>
 #include <limits>
 #include <stdlib.h>
-#include <type_traits>
 
 
 #    ifdef fpclassify
diff --git a/libcxx/include/mutex b/libcxx/include/mutex
--- a/libcxx/include/mutex
+++ b/libcxx/include/mutex
@@ -706,6 +706,7 @@
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
 #  include <functional>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_MUTEX
diff --git a/libcxx/include/new b/libcxx/include/new
--- a/libcxx/include/new
+++ b/libcxx/include/new
@@ -89,10 +89,12 @@
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__availability>
 #include <__config>
+#include <__type_traits/is_function.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/remove_cv.h>
 #include <cstddef>
 #include <cstdlib>
 #include <exception>
-#include <type_traits>
 #include <version>
 
 #if defined(_LIBCPP_ABI_VCRUNTIME)
@@ -401,4 +403,8 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
+#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <type_traits>
+#endif
+
 #endif // _LIBCPP_NEW
diff --git a/libcxx/include/ostream b/libcxx/include/ostream
--- a/libcxx/include/ostream
+++ b/libcxx/include/ostream
@@ -1191,6 +1191,7 @@
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
 #  include <iterator>
+#  include <type_traits>
 #endif
 
 #endif // _LIBCPP_OSTREAM
diff --git a/libcxx/include/scoped_allocator b/libcxx/include/scoped_allocator
--- a/libcxx/include/scoped_allocator
+++ b/libcxx/include/scoped_allocator
@@ -725,6 +725,7 @@
 #  include <memory>
 #  include <ratio>
 #  include <stdexcept>
+#  include <type_traits>
 #  include <variant>
 #endif
 
diff --git a/libcxx/include/valarray b/libcxx/include/valarray
--- a/libcxx/include/valarray
+++ b/libcxx/include/valarray
@@ -353,6 +353,7 @@
 #include <__functional/operations.h>
 #include <__memory/allocator.h>
 #include <__memory/uninitialized_algorithms.h>
+#include <__type_traits/remove_reference.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
 #include <cmath>
diff --git a/libcxx/test/libcxx/numerics/numeric.ops/midpoint.integer.pass.cpp b/libcxx/test/libcxx/numerics/numeric.ops/midpoint.integer.pass.cpp
--- a/libcxx/test/libcxx/numerics/numeric.ops/midpoint.integer.pass.cpp
+++ b/libcxx/test/libcxx/numerics/numeric.ops/midpoint.integer.pass.cpp
@@ -13,9 +13,11 @@
 // _Tp midpoint(_Tp __a, _Tp __b) noexcept
 //
 
-#include <numeric>
 #include <cassert>
+#include <cstddef>
 #include <cstdint>
+#include <numeric>
+
 #include "test_macros.h"
 
 //  Users are not supposed to provide template argument lists for
diff --git a/libcxx/test/libcxx/transitive_includes/cxx03.csv b/libcxx/test/libcxx/transitive_includes/cxx03.csv
--- a/libcxx/test/libcxx/transitive_includes/cxx03.csv
+++ b/libcxx/test/libcxx/transitive_includes/cxx03.csv
@@ -207,7 +207,6 @@
 expected exception
 expected initializer_list
 expected new
-expected type_traits
 expected version
 experimental/algorithm algorithm
 experimental/algorithm cstddef
diff --git a/libcxx/test/libcxx/transitive_includes/cxx11.csv b/libcxx/test/libcxx/transitive_includes/cxx11.csv
--- a/libcxx/test/libcxx/transitive_includes/cxx11.csv
+++ b/libcxx/test/libcxx/transitive_includes/cxx11.csv
@@ -207,7 +207,6 @@
 expected exception
 expected initializer_list
 expected new
-expected type_traits
 expected version
 experimental/algorithm algorithm
 experimental/algorithm cstddef
diff --git a/libcxx/test/libcxx/transitive_includes/cxx14.csv b/libcxx/test/libcxx/transitive_includes/cxx14.csv
--- a/libcxx/test/libcxx/transitive_includes/cxx14.csv
+++ b/libcxx/test/libcxx/transitive_includes/cxx14.csv
@@ -207,7 +207,6 @@
 expected exception
 expected initializer_list
 expected new
-expected type_traits
 expected version
 experimental/algorithm algorithm
 experimental/algorithm cstddef
diff --git a/libcxx/test/libcxx/transitive_includes/cxx17.csv b/libcxx/test/libcxx/transitive_includes/cxx17.csv
--- a/libcxx/test/libcxx/transitive_includes/cxx17.csv
+++ b/libcxx/test/libcxx/transitive_includes/cxx17.csv
@@ -207,7 +207,6 @@
 expected exception
 expected initializer_list
 expected new
-expected type_traits
 expected version
 experimental/algorithm algorithm
 experimental/algorithm cstddef
diff --git a/libcxx/test/libcxx/transitive_includes/cxx20.csv b/libcxx/test/libcxx/transitive_includes/cxx20.csv
--- a/libcxx/test/libcxx/transitive_includes/cxx20.csv
+++ b/libcxx/test/libcxx/transitive_includes/cxx20.csv
@@ -219,7 +219,6 @@
 expected exception
 expected initializer_list
 expected new
-expected type_traits
 expected version
 experimental/algorithm algorithm
 experimental/algorithm cstddef
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b.csv b/libcxx/test/libcxx/transitive_includes/cxx2b.csv
--- a/libcxx/test/libcxx/transitive_includes/cxx2b.csv
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b.csv
@@ -100,7 +100,6 @@
 chrono type_traits
 chrono version
 cinttypes cstdint
-cmath type_traits
 cmath version
 codecvt cctype
 codecvt cstddef
@@ -113,7 +112,6 @@
 compare cstddef
 compare cstdint
 compare limits
-compare type_traits
 compare version
 complex cmath
 complex iosfwd
@@ -135,7 +133,6 @@
 condition_variable ratio
 condition_variable stdexcept
 condition_variable system_error
-condition_variable type_traits
 condition_variable typeinfo
 condition_variable version
 coroutine compare
@@ -164,7 +161,6 @@
 deque version
 exception cstddef
 exception cstdlib
-exception type_traits
 exception version
 execution version
 expected cstddef
@@ -172,7 +168,6 @@
 expected exception
 expected initializer_list
 expected new
-expected type_traits
 expected version
 experimental/algorithm algorithm
 experimental/algorithm cstddef
@@ -364,7 +359,6 @@
 istream cstddef
 istream iosfwd
 istream ostream
-istream type_traits
 istream version
 iterator compare
 iterator concepts
@@ -432,7 +426,6 @@
 memory new
 memory stdexcept
 memory tuple
-memory type_traits
 memory typeinfo
 memory version
 memory_resource cstddef
@@ -456,13 +449,11 @@
 mutex stdexcept
 mutex system_error
 mutex tuple
-mutex type_traits
 mutex typeinfo
 mutex version
 new cstddef
 new cstdlib
 new exception
-new type_traits
 new version
 numbers type_traits
 numbers version
@@ -495,7 +486,6 @@
 ostream new
 ostream stdexcept
 ostream streambuf
-ostream type_traits
 ostream typeinfo
 ostream version
 queue compare
@@ -557,7 +547,6 @@
 scoped_allocator limits
 scoped_allocator new
 scoped_allocator tuple
-scoped_allocator type_traits
 scoped_allocator version
 semaphore atomic
 semaphore ctime
diff --git a/libcxx/test/std/language.support/support.dynamic/align_val_t.pass.cpp b/libcxx/test/std/language.support/support.dynamic/align_val_t.pass.cpp
--- a/libcxx/test/std/language.support/support.dynamic/align_val_t.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/align_val_t.pass.cpp
@@ -15,6 +15,7 @@
 // UNSUPPORTED: target={{.+}}-zos{{.*}}
 
 #include <new>
+#include <type_traits>
 
 #include "test_macros.h"
 
diff --git a/libcxx/test/support/count_new.h b/libcxx/test/support/count_new.h
--- a/libcxx/test/support/count_new.h
+++ b/libcxx/test/support/count_new.h
@@ -12,6 +12,7 @@
 # include <cstdlib>
 # include <cassert>
 # include <new>
+#include <type_traits>
 
 #include "test_macros.h"