Update libcxx to 02 June 2023 185b81e034ba60081023b6e59504dfffb560f3e3 (llvmorg-16.0.5)

:warning:  Для всех проектов и мимо проходящим коллегам :warning:

Если по каким-то причинам ваши тесты подломались, пожалуйста, переканонизируйте их сами. По статистике там просто поменялся порядок в канонизации.
Если изменения действительно серьезные -- приходите в [DEVTOOLSSUPPORT](https://st.yandex-team.ru/createTicket?queue=DEVTOOLSSUPPORT) / пишите в телеграм / призывайте в тикеты, будем разбираться.

```
Changes:
    [libc++] Don't try to provide source_location on AppleClang 1403
    [release/16.x][libc++] Revert the bitset sort optimization
    [libc++] Avoid ODR violations in __exception_guard
    [libc++][ranges] Fix incorrect integer typedef in `elements_view` test.
    [libc++][format] Fix a missing include in tests.
    [libc++][format] Fixes invalid usage of m type.
    [libc++][format] Fix floating point formatting.
    [libc++] Fix ranges::binary_search() returning true for cases where the element is not in the range
    [libc++] Temporarily not use compiler intrinsics for some type traits in Objective-C++ mode.
    [libc++][ranges] move all range iterators back in class
    [libcxx][ranges] revert join_view::iterator and sentinel to be in-class
    [libc++] Add FTM for views::as_rvalue
    [libc++] Fix bug in allocate_shared_for_overwrite
    [libc++] fix `shared_ptr`'s incorrect constraints
    [libc++] In tests, use `abort` to terminate upon an error.
    [libc++] Guard the fix to CityHash behind ABI v2
    [libc++][format] Fixes constexpr validation.
    [libc++] Remove use of internal glibc macros to determine if c8rtomb() and mbrtoc8() are present.
    [libc++] Fixes the Clang modular build.
    [libc++][ranges] Temporarily mark `ranges::join_view` as experimental.
    libcxx: Don't apply ABI tags to extern "C" fns
    [libc++] Introduce a compile-time mechanism to override __libcpp_verbose_abort
    [libc++][format] Fixes usage of contiguous ranges.
    [libc++][doc] Updates format status.
    [libc++][ranges] implement `std::ranges::split_view`
    [libc++] implement P1020R1 P1973R1 make_unique[shared]_for_overwrite
    [libc++] Improve binary size when using __transaction
    [libc++] Rename take_while_view::__sentinel to __take_while_view_sentinel
    [libc++] Granularize <type_traits> includes in <bit>, <numbers> and <coroutine>
    [libc++] Implement P1413R3 (Deprecate std::aligned_storage and std::aligned_union)
    [libc++] Add FreeBSD XFAILs in preparation for CI
    [libc++] add FreeBSD atomic wait support
    [libc++][format] range-default-formatter for set.
    [libc++] Move iota_view::iterator and sentinel out of iota_view
    [libc++] Enable clang-tidy from the buildkite pipeline instead of hard-coding it in run-buildbot
    [libc++] Enable segmented iterator optimizations for join_view::iterator
    [libc++] Mark LWG3349 as complete
    [libc++] Remove old CI configurations and update the supported compiler versions
    [libc++] Implement P2446R2 (views::as_rvalue)
    [libc++][format] range-default-formatter for map
    [libc++][format] Adds formatter std::vector<bool>.
    [libc++][format] Adds container adaptor formatters.
    [libc++][format] Implements range_formatter
    [libc++][format] Adds new test macros.
    [libc++][ranges] Remove a leftover include version control markers in Cxx20Papers.csv
    [libc++][ranges] Mark completed Ranges papers and issues as done, bump version macro
    [libc++] Add ALLOW_RETRIES to a few flaky tests
    [SystemZ][z/OS] Fix cityhash lit for EBCDIC
    [libc++] Mark std::pmr virtual functions as _LIBCPP_HIDE_FROM_ABI_VIRTUAL
    [libc++] Remove <type_traits> includes from <atomic> and <ratio>
    [libcxx] Add missing includes
    [libc++] allow redefined macro in non_trivial_copy_move_ABI test
    [libc++][ranges] implement `std::views::elements_view`
    [libc++] Add [[clang::lifetimebound]] attribute to std::forward and friends
    Reapply "[libc++][ranges]Refactor `copy{,_backward}` and `move{,_backward}`"
    [libc++] Add clang-tidy to the list of possible substitutions for %{clang-tidy}
    [libc++] Add missing includes in move_iterator.h
    [libc++] Make pmr::monotonic_buffer_resource bump down
    [libc++] Add [[nodiscard]] extensions in <math.h>
    [libc++] Fix ranges::uninitialized_move{, _n} for move-only types
    [libc++][ranges] Fix incorrect integer type in `view_interface` tests.
    [libc++] Hold mutex lock while notify_all is called at notify_all_at_thread_exit
    [Libcxx] Add <source_location> header.
    [libc++] Rename transform_view::{__iterator, __sentinel} to __transform_view_{iterator, sentinel}
    [libc++] Add FreeBSD exceptions.nonew ABI list
    [libc++][format] Fixes escaping string literals.
    [libc++] Use _LIBCPP_HIDE_FROM_ABI_VIRTUAL instead of _LIBCPP_INLINE_VISIBILITY attribute on virtual function
    [libc++][test] Move `common_input_iterator` to `test_iterators.h`
    [libc++][utils] Remove unused import in `run.py`
    [libc++] Remove warning for `LIBCXX_SYSROOT`, `LIBCXX_TARGET_TRIPLE`, and `LIBCXX_GCC_TOOLCHAIN`
    [libc++] Fix aligned_alloc usage for Android
    [libc++] Use %{clang-query} when calling clang-query
    [libc++] Add missing include in __format/unicode.h
    [libc++] Remove HIDE_FROM_ABI from virtual functions
    [libc++] Fix transitive includes list for C++23
    [libc++] Add _LIBCPP_HIDE_FROM_ABI to __constexpr_logb and __constexpr_scalbn
    [libc++] Granularize <bit> and remove <__bits>
    [libc++] [C++20] [P0415] Constexpr for std::complex.
    libc++: bring back the unsigned in the return type in wcstoull_l
    [libc++][CI] Improves clang-(tidy|query) selection.
    [libc++] Granularize <type_traits> includes in <iterator>
    [libc++] Implement constexpr {isfinite, isinf, isnan, isnormal}
    [libc++][chrono] Add calendar type formatters.
    [libc++] LWG3738 Validates a missing precondition.
    [libc++] LWG3745 noexcept for atomic_wait.
    [libc++] Granularize <type_traits> includes in <compare>
    std::sort: add BlockQuickSort partitioning algorithm for arithmetic types
    [libc++] Granularize <type_traits> includes in <utility>
    [libc++][format] Removes test redundancy.
    [libc++][format] Adds formatter for tuple and pair
    [libc++] Use aligned_alloc instead of posix_memalign for C++17
    [libc++] Rename __tuple to __tuple_dir to avoid file collision
    [libc++] Add FreeBSD ABI list
    [libc++] Adds __cpp_lib_constexpr_algorithms to utility.
    [libc++] Granularize <type_traits> includes in <concepts
    [libc++][format] Renames __null_sentinel.
    Implementstd::ranges::view_interface::size returns a signed type
    [libc++] Implement P1169R4 (static operator())
    [libc++] Implement `std::expected` P0323R12
    [libc++][Android] Disable pbump2gig for Android
    [libc++][Android] Android/Bionic headers don't work with modules yet
    [libc++][math.h] Add double overloads
    [libc++] Move filter_view::iterator and sentinel out of filter_view
    [libc++] Implement P0339R6 (polymorphic_allocator<> as a vocabulary type)
    [libc++][format] Adds range-default-formatter.
    [libc++][Android] Rename user NS to User to avoid conflict with struct
    [libc++] Fix memory leaks when throwing inside std::vector constructors
```

1 files changed, 111 insertions, 34 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/include/vector b/contrib/libs/cxxsupp/libcxx/include/vector
index 53bb94c828e..32ee8cd450b 100644
--- a/contrib/libs/cxxsupp/libcxx/include/vector
+++ b/contrib/libs/cxxsupp/libcxx/include/vector
@@ -267,6 +267,13 @@ template <class T, class Allocator, class Predicate>
 typename vector<T, Allocator>::size_type
 erase_if(vector<T, Allocator>& c, Predicate pred);    // C++20
 
+
+template<class T>
+ inline constexpr bool is-vector-bool-reference = see below;        // exposition only, since C++23
+
+template<class T, class charT> requires is-vector-bool-reference<T> // Since C++23
+ struct formatter<T, charT>;
+
 }  // std
 
 */
@@ -281,9 +288,11 @@ erase_if(vector<T, Allocator>& c, Predicate pred);    // C++20
 #include <__algorithm/unwrap_iter.h>
 #include <__assert> // all public C++ headers provide the assertion handler
 #include <__bit_reference>
+#include <__concepts/same_as.h>
 #include <__config>
 #include <__debug>
 #include <__format/enable_insertable.h>
+#include <__format/formatter.h>
 #include <__functional/hash.h>
 #include <__functional/unary_function.h>
 #include <__iterator/advance.h>
@@ -299,6 +308,7 @@ erase_if(vector<T, Allocator>& c, Predicate pred);    // C++20
 #include <__split_buffer>
 #include <__type_traits/is_allocator.h>
 #include <__type_traits/noexcept_move_assign_container.h>
+#include <__utility/exception_guard.h>
 #include <__utility/forward.h>
 #include <__utility/move.h>
 #include <__utility/swap.h>
@@ -428,18 +438,27 @@ public:
   _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
   vector(_ForwardIterator __first, _ForwardIterator __last, const allocator_type& __a);
 
-    _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
-    ~vector()
-    {
-      __annotate_delete();
-      std::__debug_db_erase_c(this);
+private:
+  class __destroy_vector {
+    public:
+      _LIBCPP_CONSTEXPR __destroy_vector(vector& __vec) : __vec_(__vec) {}
 
-      if (this->__begin_ != nullptr)
-      {
-        __clear();
-        __alloc_traits::deallocate(__alloc(), this->__begin_, capacity());
+      _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void operator()() {
+          __vec_.__annotate_delete();
+          std::__debug_db_erase_c(std::addressof(__vec_));
+
+          if (__vec_.__begin_ != nullptr) {
+            __vec_.__clear();
+            __alloc_traits::deallocate(__vec_.__alloc(), __vec_.__begin_, __vec_.capacity());
+          }
       }
-    }
+
+    private:
+      vector& __vec_;
+  };
+
+public:
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI ~vector() { __destroy_vector(*this)(); }
 
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI vector(const vector& __x);
     _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI vector(const vector& __x, const __type_identity_t<allocator_type>& __a);
@@ -1080,12 +1099,14 @@ template <class _Tp, class _Allocator>
 _LIBCPP_CONSTEXPR_SINCE_CXX20
 vector<_Tp, _Allocator>::vector(size_type __n)
 {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     std::__debug_db_insert_c(this);
     if (__n > 0)
     {
         __vallocate(__n);
         __construct_at_end(__n);
     }
+    __guard.__complete();
 }
 
 #if _LIBCPP_STD_VER > 11
@@ -1094,12 +1115,14 @@ _LIBCPP_CONSTEXPR_SINCE_CXX20
 vector<_Tp, _Allocator>::vector(size_type __n, const allocator_type& __a)
     : __end_cap_(nullptr, __a)
 {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     std::__debug_db_insert_c(this);
     if (__n > 0)
     {
         __vallocate(__n);
         __construct_at_end(__n);
     }
+    __guard.__complete();
 }
 #endif
 
@@ -1107,12 +1130,14 @@ template <class _Tp, class _Allocator>
 _LIBCPP_CONSTEXPR_SINCE_CXX20
 vector<_Tp, _Allocator>::vector(size_type __n, const value_type& __x)
 {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     std::__debug_db_insert_c(this);
     if (__n > 0)
     {
         __vallocate(__n);
         __construct_at_end(__n, __x);
     }
+    __guard.__complete();
 }
 
 template <class _Tp, class _Allocator>
@@ -1122,9 +1147,11 @@ template <class _InputIterator, __enable_if_t<__is_exactly_cpp17_input_iterator<
 _LIBCPP_CONSTEXPR_SINCE_CXX20
 vector<_Tp, _Allocator>::vector(_InputIterator __first, _InputIterator __last)
 {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     std::__debug_db_insert_c(this);
     for (; __first != __last; ++__first)
         emplace_back(*__first);
+    __guard.__complete();
 }
 
 template <class _Tp, class _Allocator>
@@ -1135,9 +1162,11 @@ _LIBCPP_CONSTEXPR_SINCE_CXX20
 vector<_Tp, _Allocator>::vector(_InputIterator __first, _InputIterator __last, const allocator_type& __a)
     : __end_cap_(nullptr, __a)
 {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     std::__debug_db_insert_c(this);
     for (; __first != __last; ++__first)
         emplace_back(*__first);
+    __guard.__complete();
 }
 
 template <class _Tp, class _Allocator>
@@ -1147,6 +1176,7 @@ template <class _ForwardIterator, __enable_if_t<__is_cpp17_forward_iterator<_For
 _LIBCPP_CONSTEXPR_SINCE_CXX20
 vector<_Tp, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __last)
 {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     std::__debug_db_insert_c(this);
     size_type __n = static_cast<size_type>(std::distance(__first, __last));
     if (__n > 0)
@@ -1154,6 +1184,7 @@ vector<_Tp, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __las
         __vallocate(__n);
         __construct_at_end(__first, __last, __n);
     }
+    __guard.__complete();
 }
 
 template <class _Tp, class _Allocator>
@@ -1164,6 +1195,7 @@ _LIBCPP_CONSTEXPR_SINCE_CXX20
 vector<_Tp, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __last, const allocator_type& __a)
     : __end_cap_(nullptr, __a)
 {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     std::__debug_db_insert_c(this);
     size_type __n = static_cast<size_type>(std::distance(__first, __last));
     if (__n > 0)
@@ -1171,6 +1203,7 @@ vector<_Tp, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __las
         __vallocate(__n);
         __construct_at_end(__first, __last, __n);
     }
+    __guard.__complete();
 }
 
 template <class _Tp, class _Allocator>
@@ -1178,6 +1211,7 @@ _LIBCPP_CONSTEXPR_SINCE_CXX20
 vector<_Tp, _Allocator>::vector(const vector& __x)
     : __end_cap_(nullptr, __alloc_traits::select_on_container_copy_construction(__x.__alloc()))
 {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     std::__debug_db_insert_c(this);
     size_type __n = __x.size();
     if (__n > 0)
@@ -1185,6 +1219,7 @@ vector<_Tp, _Allocator>::vector(const vector& __x)
         __vallocate(__n);
         __construct_at_end(__x.__begin_, __x.__end_, __n);
     }
+    __guard.__complete();
 }
 
 template <class _Tp, class _Allocator>
@@ -1192,6 +1227,7 @@ _LIBCPP_CONSTEXPR_SINCE_CXX20
 vector<_Tp, _Allocator>::vector(const vector& __x, const __type_identity_t<allocator_type>& __a)
     : __end_cap_(nullptr, __a)
 {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     std::__debug_db_insert_c(this);
     size_type __n = __x.size();
     if (__n > 0)
@@ -1199,6 +1235,7 @@ vector<_Tp, _Allocator>::vector(const vector& __x, const __type_identity_t<alloc
         __vallocate(__n);
         __construct_at_end(__x.__begin_, __x.__end_, __n);
     }
+    __guard.__complete();
 }
 
 template <class _Tp, class _Allocator>
@@ -1238,7 +1275,9 @@ vector<_Tp, _Allocator>::vector(vector&& __x, const __type_identity_t<allocator_
     else
     {
         typedef move_iterator<iterator> _Ip;
+        auto __guard = std::__make_exception_guard(__destroy_vector(*this));
         assign(_Ip(__x.begin()), _Ip(__x.end()));
+        __guard.__complete();
     }
 }
 
@@ -1249,12 +1288,14 @@ _LIBCPP_CONSTEXPR_SINCE_CXX20
 inline _LIBCPP_HIDE_FROM_ABI
 vector<_Tp, _Allocator>::vector(initializer_list<value_type> __il)
 {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     std::__debug_db_insert_c(this);
     if (__il.size() > 0)
     {
         __vallocate(__il.size());
         __construct_at_end(__il.begin(), __il.end(), __il.size());
     }
+    __guard.__complete();
 }
 
 template <class _Tp, class _Allocator>
@@ -1263,12 +1304,14 @@ inline _LIBCPP_HIDE_FROM_ABI
 vector<_Tp, _Allocator>::vector(initializer_list<value_type> __il, const allocator_type& __a)
     : __end_cap_(nullptr, __a)
 {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     std::__debug_db_insert_c(this);
     if (__il.size() > 0)
     {
         __vallocate(__il.size());
         __construct_at_end(__il.begin(), __il.end(), __il.size());
     }
+    __guard.__complete();
 }
 
 #endif // _LIBCPP_CXX03_LANG
@@ -1923,18 +1966,6 @@ vector<_Tp, _Allocator>::resize(size_type __sz)
         this->__destruct_at_end(this->__begin_ + __sz);
 }
 
-template <class _Tp, class _Allocator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
-void
-vector<_Tp, _Allocator>::resize(size_type __sz, const_reference __x)
-{
-    size_type __cs = size();
-    if (__cs < __sz)
-        this->__append(__sz - __cs, __x);
-    else if (__cs > __sz)
-        this->__destruct_at_end(this->__begin_ + __sz);
-}
-
 #if _YNDX_LIBCXX_ENABLE_VECTOR_POD_RESIZE_UNINITIALIZED
 
 template <class _Tp, class _Allocator>
@@ -1955,6 +1986,18 @@ vector<_Tp, _Allocator>::resize_uninitialized(size_type __sz)
 template <class _Tp, class _Allocator>
 _LIBCPP_CONSTEXPR_SINCE_CXX20
 void
+vector<_Tp, _Allocator>::resize(size_type __sz, const_reference __x)
+{
+    size_type __cs = size();
+    if (__cs < __sz)
+        this->__append(__sz - __cs, __x);
+    else if (__cs > __sz)
+        this->__destruct_at_end(this->__begin_ + __sz);
+}
+
+template <class _Tp, class _Allocator>
+_LIBCPP_CONSTEXPR_SINCE_CXX20
+void
 vector<_Tp, _Allocator>::swap(vector& __x)
 #if _LIBCPP_STD_VER >= 14
     _NOEXCEPT
@@ -2132,7 +2175,25 @@ public:
 #else
         _NOEXCEPT;
 #endif
-    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 ~vector();
+
+private:
+  class __destroy_vector {
+    public:
+      _LIBCPP_CONSTEXPR __destroy_vector(vector& __vec) : __vec_(__vec) {}
+
+      _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void operator()() {
+        if (__vec_.__begin_ != nullptr)
+            __storage_traits::deallocate(__vec_.__alloc(), __vec_.__begin_, __vec_.__cap());
+        std::__debug_db_invalidate_all(this);
+      }
+
+    private:
+      vector& __vec_;
+  };
+
+public:
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 ~vector() { __destroy_vector(*this)(); }
+
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit vector(size_type __n);
 #if _LIBCPP_STD_VER > 11
     _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit vector(size_type __n, const allocator_type& __a);
@@ -2668,12 +2729,14 @@ vector<bool, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __la
       __size_(0),
       __cap_alloc_(0, __default_init_tag())
 {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     size_type __n = static_cast<size_type>(std::distance(__first, __last));
     if (__n > 0)
     {
         __vallocate(__n);
         __construct_at_end(__first, __last);
     }
+    __guard.__complete();
 }
 
 template <class _Allocator>
@@ -2685,12 +2748,14 @@ vector<bool, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __la
       __size_(0),
       __cap_alloc_(0, static_cast<__storage_allocator>(__a))
 {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
     size_type __n = static_cast<size_type>(std::distance(__first, __last));
     if (__n > 0)
     {
         __vallocate(__n);
         __construct_at_end(__first, __last);
     }
+    __guard.__complete();
 }
 
 #ifndef _LIBCPP_CXX03_LANG
@@ -2729,15 +2794,6 @@ vector<bool, _Allocator>::vector(initializer_list<value_type> __il, const alloca
 
 template <class _Allocator>
 _LIBCPP_CONSTEXPR_SINCE_CXX20
-vector<bool, _Allocator>::~vector()
-{
-    if (__begin_ != nullptr)
-        __storage_traits::deallocate(__alloc(), __begin_, __cap());
-    std::__debug_db_invalidate_all(this);
-}
-
-template <class _Allocator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20
 vector<bool, _Allocator>::vector(const vector& __v)
     : __begin_(nullptr),
       __size_(0),
@@ -3355,14 +3411,35 @@ erase_if(vector<_Tp, _Allocator>& __c, _Predicate __pred) {
 }
 
 template <>
-inline constexpr bool __format::__enable_insertable<std::vector<char>> = true;
+inline constexpr bool __format::__enable_insertable<vector<char>> = true;
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <>
-inline constexpr bool __format::__enable_insertable<std::vector<wchar_t>> = true;
+inline constexpr bool __format::__enable_insertable<vector<wchar_t>> = true;
 #endif
 
 #endif // _LIBCPP_STD_VER > 17
 
+#if _LIBCPP_STD_VER > 20
+template <class _Tp, class CharT>
+// Since is-vector-bool-reference is only used once it's inlined here.
+  requires same_as<typename _Tp::__container, vector<bool, typename _Tp::__container::allocator_type>>
+struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<_Tp, CharT> {
+private:
+  formatter<bool, CharT> __underlying_;
+
+public:
+  template <class _ParseContext>
+  _LIBCPP_HIDE_FROM_ABI constexpr typename _ParseContext::iterator parse(_ParseContext& __ctx) {
+        return __underlying_.parse(__ctx);
+  }
+
+  template <class _FormatContext>
+  _LIBCPP_HIDE_FROM_ABI typename _FormatContext::iterator format(const _Tp& __ref, _FormatContext& __ctx) const {
+        return __underlying_.format(__ref, __ctx);
+  }
+};
+#endif // _LIBCPP_STD_VER > 20
+
 _LIBCPP_END_NAMESPACE_STD
 
 #if _LIBCPP_STD_VER > 14