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diff --git a/libstdc++-v3/testsuite/20_util/weak_ptr/lock/1.cc b/libstdc++-v3/testsuite/20_util/weak_ptr/lock/1.cc
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+// 2006-09-24  Paolo Carlini  <pcarlini@suse.de>
+
+// Copyright (C) 2006, 2007, 2009 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 20.6.6.3 Template class weak_ptr [util.smartptr.weak]
+
+#include <memory>
+#include <testsuite_tr1.h>
+
+// { dg-do compile }
+// { dg-options "-std=gnu++0x" }
+
+int main()
+{
+  using __gnu_test::check_ret_type;
+  using std::weak_ptr;
+  using std::shared_ptr;
+
+  weak_ptr<int> wp;
+  check_ret_type<shared_ptr<int> >(wp.lock());
+}