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diff --git a/contrib/llvm-project/libcxx/include/__algorithm/ranges_move_backward.h b/contrib/llvm-project/libcxx/include/__algorithm/ranges_move_backward.h
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+++ b/contrib/llvm-project/libcxx/include/__algorithm/ranges_move_backward.h
@@ -0,0 +1,75 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_RANGES_MOVE_BACKWARD_H
+#define _LIBCPP___ALGORITHM_RANGES_MOVE_BACKWARD_H
+
+#include <__algorithm/in_out_result.h>
+#include <__algorithm/ranges_move.h>
+#include <__config>
+#include <__iterator/concepts.h>
+#include <__iterator/iter_move.h>
+#include <__iterator/next.h>
+#include <__iterator/reverse_iterator.h>
+#include <__ranges/access.h>
+#include <__ranges/concepts.h>
+#include <__ranges/dangling.h>
+#include <__utility/move.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace ranges {
+
+template <class _InIter, class _OutIter>
+using move_backward_result = in_out_result<_InIter, _OutIter>;
+
+namespace __move_backward {
+struct __fn {
+
+  template <class _InIter, class _Sent, class _OutIter>
+  _LIBCPP_HIDE_FROM_ABI constexpr static
+  move_backward_result<_InIter, _OutIter> __move_backward_impl(_InIter __first, _Sent __last, _OutIter __result) {
+    auto __ret = ranges::move(std::make_reverse_iterator(ranges::next(__first, __last)),
+                              std::make_reverse_iterator(__first),
+                              std::make_reverse_iterator(__result));
+    return {std::move(__ret.in.base()), std::move(__ret.out.base())};
+  }
+
+  template <bidirectional_iterator _InIter, sentinel_for<_InIter> _Sent, bidirectional_iterator _OutIter>
+    requires indirectly_movable<_InIter, _OutIter>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  move_backward_result<_InIter, _OutIter> operator()(_InIter __first, _Sent __last, _OutIter __result) const {
+    return __move_backward_impl(std::move(__first), std::move(__last), std::move(__result));
+  }
+
+  template <bidirectional_range _Range, bidirectional_iterator _Iter>
+    requires indirectly_movable<iterator_t<_Range>, _Iter>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  move_backward_result<borrowed_iterator_t<_Range>, _Iter> operator()(_Range&& __range, _Iter __result) const {
+    return __move_backward_impl(ranges::begin(__range), ranges::end(__range), std::move(__result));
+  }
+
+};
+} // namespace __move_backward
+
+inline namespace __cpo {
+  inline constexpr auto move_backward = __move_backward::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+#endif // _LIBCPP___ALGORITHM_RANGES_MOVE_BACKWARD_H