1 files changed, 25 insertions, 0 deletions
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/assign.fail.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/assign.fail.cpp
new file mode 100644
index 00000000000..53abb42c0e3
--- /dev/null
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/assign.fail.cpp
@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <mutex>
+
+// template <class Mutex> class lock_guard;
+
+// lock_guard& operator=(lock_guard const&) = delete;
+
+#include <mutex>
+
+int main()
+{
+    std::mutex m0;
+    std::mutex m1;
+    std::lock_guard<std::mutex> lg0(m0);
+    std::lock_guard<std::mutex> lg(m1);
+    lg = lg0;
+}