1 files changed, 43 insertions, 0 deletions
diff --git a/libcxx/test/std/thread/futures/futures.promise/set_lvalue.pass.cpp b/libcxx/test/std/thread/futures/futures.promise/set_lvalue.pass.cpp
new file mode 100644
index 00000000000..cdc37775012
--- /dev/null
+++ b/libcxx/test/std/thread/futures/futures.promise/set_lvalue.pass.cpp
@@ -0,0 +1,43 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+//
+// UNSUPPORTED: libcpp-has-no-threads
+
+// <future>
+
+// class promise<R>
+
+// void promise<R&>::set_value(R& r);
+
+#include <future>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef int& T;
+        int i = 3;
+        std::promise<T> p;
+        std::future<T> f = p.get_future();
+        p.set_value(i);
+        int& j = f.get();
+        assert(j == 3);
+        ++i;
+        assert(j == 4);
+        try
+        {
+            p.set_value(i);
+            assert(false);
+        }
+        catch (const std::future_error& e)
+        {
+            assert(e.code() == make_error_code(std::future_errc::promise_already_satisfied));
+        }
+    }
+}