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
@@ -11,10 +11,13 @@
 #define _LIBCPP___MEMORY_COMPRESSED_PAIR_H
 
 #include <__config>
+#include <__fwd/get.h>
+#include <__fwd/tuple.h>
+#include <__tuple/tuple_indices.h>
 #include <__type_traits/dependent_type.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
-#include <tuple> // needed in c++03 for some constructors
+#include <__utility/piecewise_construct.h>
 #include <type_traits>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
diff --git a/libcxx/include/__string/char_traits.h b/libcxx/include/__string/char_traits.h
--- a/libcxx/include/__string/char_traits.h
+++ b/libcxx/include/__string/char_traits.h
@@ -14,15 +14,14 @@
 #include <__algorithm/find_end.h>
 #include <__algorithm/find_first_of.h>
 #include <__algorithm/min.h>
+#include <__compare/ordering.h>
 #include <__config>
 #include <__functional/hash.h>
 #include <__iterator/iterator_traits.h>
-#include <compare>
+#include <__type_traits/is_constant_evaluated.h>
 #include <cstdint>
 #include <cstdio>
-#include <cstring>
 #include <iosfwd>
-#include <type_traits>
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 #   include <cwchar> // for wmemcpy
diff --git a/libcxx/include/functional b/libcxx/include/functional
--- a/libcxx/include/functional
+++ b/libcxx/include/functional
@@ -534,7 +534,6 @@
 #include <concepts>
 #include <exception>
 #include <memory> // TODO: find out why removing this breaks the modules build
-#include <tuple>
 #include <type_traits>
 #include <typeinfo>
 #include <version>
@@ -544,6 +543,7 @@
 #endif
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+#  include <tuple>
 #  include <utility>
 #endif
 
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.algorithm b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.algorithm
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.algorithm
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.algorithm
@@ -1,7 +1,5 @@
 bit
 climits
-cmath
-compare
 concepts
 cstddef
 cstdint
@@ -12,6 +10,5 @@
 iosfwd
 limits
 new
-tuple
 type_traits
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.any b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.any
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.any
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.any
@@ -1,7 +1,5 @@
 atomic
 climits
-cmath
-compare
 concepts
 cstddef
 cstdint
@@ -15,7 +13,6 @@
 new
 ratio
 stdexcept
-tuple
 type_traits
 typeinfo
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.barrier b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.barrier
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.barrier
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.barrier
@@ -1,7 +1,5 @@
 atomic
 climits
-cmath
-compare
 cstddef
 cstdint
 cstdlib
@@ -12,6 +10,5 @@
 limits
 new
 ratio
-tuple
 type_traits
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.bitset b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.bitset
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.bitset
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.bitset
@@ -18,6 +18,5 @@
 stdexcept
 string
 string_view
-tuple
 type_traits
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.condition_variable b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.condition_variable
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.condition_variable
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.condition_variable
@@ -23,7 +23,6 @@
 string
 string_view
 system_error
-tuple
 type_traits
 typeinfo
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.deque b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.deque
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.deque
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.deque
@@ -15,7 +15,6 @@
 new
 ratio
 stdexcept
-tuple
 type_traits
 typeinfo
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.experimental_algorithm b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.experimental_algorithm
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.experimental_algorithm
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.experimental_algorithm
@@ -1,8 +1,6 @@
 algorithm
 bit
 climits
-cmath
-compare
 concepts
 cstddef
 cstdint
@@ -13,6 +11,5 @@
 iosfwd
 limits
 new
-tuple
 type_traits
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.forward_list b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.forward_list
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.forward_list
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.forward_list
@@ -15,7 +15,6 @@
 new
 ratio
 stdexcept
-tuple
 type_traits
 typeinfo
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.list b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.list
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.list
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.list
@@ -15,7 +15,6 @@
 new
 ratio
 stdexcept
-tuple
 type_traits
 typeinfo
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.memory b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.memory
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.memory
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.memory
@@ -15,7 +15,6 @@
 new
 ratio
 stdexcept
-tuple
 type_traits
 typeinfo
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.queue b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.queue
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.queue
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.queue
@@ -16,7 +16,6 @@
 new
 ratio
 stdexcept
-tuple
 type_traits
 typeinfo
 vector
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.random b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.random
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.random
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.random
@@ -23,7 +23,6 @@
 stdexcept
 string
 string_view
-tuple
 type_traits
 typeinfo
 vector
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.set b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.set
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.set
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.set
@@ -12,6 +12,5 @@
 new
 optional
 stdexcept
-tuple
 type_traits
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.shared_mutex b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.shared_mutex
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.shared_mutex
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.shared_mutex
@@ -22,6 +22,5 @@
 string
 string_view
 system_error
-tuple
 type_traits
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.stack b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.stack
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.stack
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.stack
@@ -16,7 +16,6 @@
 new
 ratio
 stdexcept
-tuple
 type_traits
 typeinfo
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.string b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.string
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.string
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.string
@@ -17,6 +17,5 @@
 new
 stdexcept
 string_view
-tuple
 type_traits
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.system_error b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.system_error
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.system_error
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.system_error
@@ -19,6 +19,5 @@
 stdexcept
 string
 string_view
-tuple
 type_traits
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.unordered_set b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.unordered_set
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.unordered_set
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.unordered_set
@@ -12,6 +12,5 @@
 new
 optional
 stdexcept
-tuple
 type_traits
 version
diff --git a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.vector b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.vector
--- a/libcxx/test/libcxx/transitive_includes/cxx2b/expected.vector
+++ b/libcxx/test/libcxx/transitive_includes/cxx2b/expected.vector
@@ -15,7 +15,6 @@
 new
 ratio
 stdexcept
-tuple
 type_traits
 typeinfo
 version
diff --git a/libcxx/test/std/algorithms/alg.sorting/alg.min.max/minmax_comp.pass.cpp b/libcxx/test/std/algorithms/alg.sorting/alg.min.max/minmax_comp.pass.cpp
--- a/libcxx/test/std/algorithms/alg.sorting/alg.min.max/minmax_comp.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.sorting/alg.min.max/minmax_comp.pass.cpp
@@ -14,8 +14,9 @@
 //   minmax(const T& a, const T& b, Compare comp);
 
 #include <algorithm>
-#include <functional>
 #include <cassert>
+#include <functional>
+#include <utility>
 
 #include "test_macros.h"
 
diff --git a/libcxx/test/std/algorithms/alg.sorting/alg.sort/stable.sort/stable_sort_comp.pass.cpp b/libcxx/test/std/algorithms/alg.sorting/alg.sort/stable.sort/stable_sort_comp.pass.cpp
--- a/libcxx/test/std/algorithms/alg.sorting/alg.sort/stable.sort/stable_sort_comp.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.sorting/alg.sort/stable.sort/stable_sort_comp.pass.cpp
@@ -21,6 +21,7 @@
 #include <cassert>
 #include <cstddef>
 #include <memory>
+#include <utility>
 
 #include "test_macros.h"
 
diff --git a/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/bind_return_type.pass.cpp b/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/bind_return_type.pass.cpp
--- a/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/bind_return_type.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.bind/bind_return_type.pass.cpp
@@ -19,9 +19,10 @@
 // only SFINAE away when too few arguments are provided. Otherwise they should
 // be well formed and should ignore any additional arguments.
 
+#include <cassert>
 #include <functional>
 #include <type_traits>
-#include <cassert>
+#include <utility>
 
 #include "test_macros.h"
 
diff --git a/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/specialization.pass.cpp b/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/specialization.pass.cpp
--- a/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/specialization.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isbind/specialization.pass.cpp
@@ -16,9 +16,10 @@
 //   be treated as a subexpression in a bind call.
 //   https://llvm.org/PR51753
 
-#include <functional>
 #include <cassert>
+#include <functional>
 #include <type_traits>
+#include <utility>
 
 struct MyBind {
     int operator()(int x, int y) const { return 10*x + y; }
diff --git a/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isplace/specialization.pass.cpp b/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isplace/specialization.pass.cpp
--- a/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isplace/specialization.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/bind/func.bind/func.bind.isplace/specialization.pass.cpp
@@ -16,9 +16,10 @@
 //   to indicate that T should be treated as a placeholder type.
 //   https://llvm.org/PR51753
 
-#include <functional>
 #include <cassert>
+#include <functional>
 #include <type_traits>
+#include <utility>
 
 struct My2 {};
 template<> struct std::is_placeholder<My2> : std::integral_constant<int, 2> {};
diff --git a/libcxx/test/std/utilities/function.objects/func.identity/identity.pass.cpp b/libcxx/test/std/utilities/function.objects/func.identity/identity.pass.cpp
--- a/libcxx/test/std/utilities/function.objects/func.identity/identity.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/func.identity/identity.pass.cpp
@@ -14,6 +14,7 @@
 
 #include <cassert>
 #include <concepts>
+#include <utility>
 
 #include "MoveOnly.h"
 
diff --git a/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.verify.cpp b/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.verify.cpp
--- a/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.verify.cpp
+++ b/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/alloc_rfunction.verify.cpp
@@ -16,9 +16,10 @@
 //
 // This signature was removed in C++17
 
+#include <cassert>
 #include <functional>
 #include <memory>
-#include <cassert>
+#include <utility>
 
 #include "test_macros.h"
 
diff --git a/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_assign.pass.cpp b/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_assign.pass.cpp
--- a/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_assign.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_assign.pass.cpp
@@ -15,8 +15,9 @@
 // This test runs in C++03, but we have deprecated using std::function in C++03.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX03_FUNCTION
 
-#include <functional>
 #include <cassert>
+#include <functional>
+#include <utility>
 
 #include "test_macros.h"
 #include "count_new.h"
diff --git a/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_move.pass.cpp b/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_move.pass.cpp
--- a/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_move.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/copy_move.pass.cpp
@@ -24,6 +24,7 @@
 #include <memory>
 #include <cstdlib>
 #include <cassert>
+#include <utility>
 
 #include "test_macros.h"
 #include "count_new.h"
diff --git a/libcxx/test/std/utilities/function.objects/range.cmp/equal_to.pass.cpp b/libcxx/test/std/utilities/function.objects/range.cmp/equal_to.pass.cpp
--- a/libcxx/test/std/utilities/function.objects/range.cmp/equal_to.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/range.cmp/equal_to.pass.cpp
@@ -12,9 +12,10 @@
 
 // ranges::equal_to
 
+#include <cassert>
 #include <functional>
 #include <type_traits>
-#include <cassert>
+#include <utility>
 
 #include "test_macros.h"
 #include "compare_types.h"
diff --git a/libcxx/test/std/utilities/function.objects/range.cmp/greater.pass.cpp b/libcxx/test/std/utilities/function.objects/range.cmp/greater.pass.cpp
--- a/libcxx/test/std/utilities/function.objects/range.cmp/greater.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/range.cmp/greater.pass.cpp
@@ -12,9 +12,10 @@
 
 // ranges::greater
 
+#include <cassert>
 #include <functional>
 #include <type_traits>
-#include <cassert>
+#include <utility>
 
 #include "test_macros.h"
 #include "compare_types.h"
diff --git a/libcxx/test/std/utilities/function.objects/range.cmp/greater_equal.pass.cpp b/libcxx/test/std/utilities/function.objects/range.cmp/greater_equal.pass.cpp
--- a/libcxx/test/std/utilities/function.objects/range.cmp/greater_equal.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/range.cmp/greater_equal.pass.cpp
@@ -12,9 +12,10 @@
 
 // ranges::greater_equal
 
+#include <cassert>
 #include <functional>
 #include <type_traits>
-#include <cassert>
+#include <utility>
 
 #include "test_macros.h"
 #include "compare_types.h"
diff --git a/libcxx/test/std/utilities/function.objects/range.cmp/less.pass.cpp b/libcxx/test/std/utilities/function.objects/range.cmp/less.pass.cpp
--- a/libcxx/test/std/utilities/function.objects/range.cmp/less.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/range.cmp/less.pass.cpp
@@ -12,9 +12,10 @@
 
 // ranges::less
 
+#include <cassert>
 #include <functional>
 #include <type_traits>
-#include <cassert>
+#include <utility>
 
 #include "test_macros.h"
 #include "compare_types.h"
diff --git a/libcxx/test/std/utilities/function.objects/range.cmp/less_equal.pass.cpp b/libcxx/test/std/utilities/function.objects/range.cmp/less_equal.pass.cpp
--- a/libcxx/test/std/utilities/function.objects/range.cmp/less_equal.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/range.cmp/less_equal.pass.cpp
@@ -12,9 +12,10 @@
 
 // ranges::less_equal
 
+#include <cassert>
 #include <functional>
 #include <type_traits>
-#include <cassert>
+#include <utility>
 
 #include "test_macros.h"
 #include "compare_types.h"
diff --git a/libcxx/test/std/utilities/function.objects/range.cmp/not_equal_to.pass.cpp b/libcxx/test/std/utilities/function.objects/range.cmp/not_equal_to.pass.cpp
--- a/libcxx/test/std/utilities/function.objects/range.cmp/not_equal_to.pass.cpp
+++ b/libcxx/test/std/utilities/function.objects/range.cmp/not_equal_to.pass.cpp
@@ -12,9 +12,10 @@
 
 // ranges::not_equal_to
 
+#include <cassert>
 #include <functional>
 #include <type_traits>
-#include <cassert>
+#include <utility>
 
 #include "test_macros.h"
 #include "compare_types.h"
diff --git a/libcxx/test/std/utilities/memory/storage.iterator/raw_storage_iterator.pass.cpp b/libcxx/test/std/utilities/memory/storage.iterator/raw_storage_iterator.pass.cpp
--- a/libcxx/test/std/utilities/memory/storage.iterator/raw_storage_iterator.pass.cpp
+++ b/libcxx/test/std/utilities/memory/storage.iterator/raw_storage_iterator.pass.cpp
@@ -11,9 +11,10 @@
 
 // raw_storage_iterator
 
+#include <cassert>
 #include <memory>
 #include <type_traits>
-#include <cassert>
+#include <utility>
 
 #include "test_macros.h"
 #include <MoveOnly.h>
diff --git a/libcxx/test/support/container_test_types.h b/libcxx/test/support/container_test_types.h
--- a/libcxx/test/support/container_test_types.h
+++ b/libcxx/test/support/container_test_types.h
@@ -84,9 +84,10 @@
  *
  */
 
-#include <functional>
 #include <cassert>
+#include <functional>
 #include <new>
+#include <utility>
 
 #include "test_macros.h"