1 files changed, 32 insertions, 0 deletions
diff --git a/libcxx/include/__expected/unexpect.h b/libcxx/include/__expected/unexpect.h
new file mode 100644
index 000000000000..20bafc1107c0
--- /dev/null
+++ b/libcxx/include/__expected/unexpect.h
@@ -0,0 +1,32 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// 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___EXPECTED_UNEXPECT_H
+#define _LIBCPP___EXPECTED_UNEXPECT_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER >= 23
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+struct unexpect_t {
+  _LIBCPP_HIDE_FROM_ABI explicit unexpect_t() = default;
+};
+
+inline constexpr unexpect_t unexpect{};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 23
+
+#endif // _LIBCPP___EXPECTED_UNEXPECT_H