Add test for template parameter with member enum T (fails by default on VS2015)

Issue: https://github.com/boostorg/optional/issues/46ű

test/optional_test_member_T.cpp

@@ -0,0 +1,44 @@
+// Copyright (C) 2014 Andrzej Krzemienski.
+//
+// Use, modification, and distribution is subject to the Boost Software
+// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/lib/optional for documentation.
+//
+// You are welcome to contact the author at:
+//  akrzemi1@gmail.com
+
+#include "boost/optional/optional.hpp"
+
+#ifdef __BORLANDC__
+#pragma hdrstop
+#endif
+
+#include "boost/core/lightweight_test.hpp"
+
+struct Status
+{
+  enum T
+  {
+    DISCONNECTED,
+    CONNECTING,
+    CONNECTED,
+  };
+
+  T mValue;
+};
+
+void test_member_T()
+{
+  boost::optional<Status> x = Status();
+  x->mValue = Status::CONNECTED;
+  
+  BOOST_TEST(x->mValue == Status::CONNECTED);
+}
+
+int main()
+{
+  test_member_T();
+  return boost::report_errors();
+}