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diff --git a/libstdc++-v3/testsuite/25_algorithms/iter_swap/20577.cc b/libstdc++-v3/testsuite/25_algorithms/iter_swap/20577.cc
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+++ b/libstdc++-v3/testsuite/25_algorithms/iter_swap/20577.cc
@@ -0,0 +1,70 @@
+// Copyright (C) 2005, 2009 Free Software Foundation, Inc.
+//
+// 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 <algorithm>
+#include <vector>
+#include <testsuite_hooks.h>
+
+void
+test1()
+{
+  bool test __attribute__((unused)) = true;
+
+  std::vector<bool> v;
+  v.push_back(true);
+  v.push_back(false);
+  std::iter_swap(v.begin(), v.begin() + 1);
+  VERIFY( v[0] == false && v[1] == true );
+}
+
+void
+test2()
+{
+  bool test __attribute__((unused)) = true;
+
+  std::vector<int> v;
+  v.push_back(1);
+  v.push_back(2);
+  std::iter_swap(v.begin(), v.begin() + 1);
+  VERIFY( v[0] == 2 && v[1] == 1 );
+}
+
+int int_swap_count;
+
+struct X {};
+void swap(X&, X&)
+{ ++int_swap_count; }
+
+void
+test3()
+{
+  bool test __attribute__((unused)) = true;
+
+  int_swap_count = 0;
+  X i, j;
+  std::iter_swap(&i, &j);
+  VERIFY( int_swap_count == 1 );
+}
+
+// libstdc++/20577
+int main()
+{
+  test1();
+  test2();
+  test3();
+  return 0;
+}