================
@@ -0,0 +1,51 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+// UNSUPPORTED: no-filesystem, no-localization, no-tzdb
+
+// XFAIL: libcpp-has-no-incomplete-tzdb
+// XFAIL: availability-tzdb-missing
+
+// <chrono>
+
+// class leap_second
+// {
+//   leap_second(const leap_second&)            = default;
+//
+//   ...
+// };
+
+#include <chrono>
+#include <concepts>
+#include <cassert>
+
+// Add the include path required by test_chrono_leap_second.h when using 
libc++.
+// ADDITIONAL_COMPILE_FLAGS(stdlib=libc++): -I %S/../../../../../src/include
+#include "test_chrono_leap_second.h"
+
+constexpr bool test() {
+  std::chrono::leap_second a =
+      
test_leap_second_create(std::chrono::sys_seconds{std::chrono::seconds{0}}, 
std::chrono::seconds{1});
+  std::chrono::leap_second b(a);
----------------
ldionne wrote:

```suggestion
  std::chrono::leap_second b = a;
```

I think this would catch the case where the copy ctor is incorrectly marked as 
`explicit`.

https://github.com/llvm/llvm-project/pull/82113
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