--- /dev/null
+// Copyright (C) 2004, 2005, 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/>.
+
+#include <map>
+#include <testsuite_hooks.h>
+
+struct T { int i; };
+
+// T must be LessThanComparable to pass concept-checks
+bool operator<(T l, T r) { return l.i < r.i; }
+
+int swap_calls;
+
+namespace std
+{
+ template<>
+ void
+ multimap<T, int>::swap(multimap<T, int>&)
+ { ++swap_calls; }
+}
+
+// Should use multimap specialization for swap.
+void test01()
+{
+ bool test __attribute__((unused)) = true;
+ std::multimap<T, int> A;
+ std::multimap<T, int> B;
+ swap_calls = 0;
+ std::swap(A, B);
+ VERIFY(1 == swap_calls);
+}
+
+// Should use multimap specialization for swap.
+void test02()
+{
+ bool test __attribute__((unused)) = true;
+ using namespace std;
+ multimap<T, int> A;
+ multimap<T, int> B;
+ swap_calls = 0;
+ swap(A, B);
+ VERIFY(1 == swap_calls);
+}
+
+// See c++/13658 for background info.
+int main()
+{
+ test01();
+ test02();
+ return 0;
+}