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diff --git a/libstdc++-v3/testsuite/23_containers/deque/invalidation/4.cc b/libstdc++-v3/testsuite/23_containers/deque/invalidation/4.cc
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+++ b/libstdc++-v3/testsuite/23_containers/deque/invalidation/4.cc
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+// Deque iterator invalidation tests
+
+// Copyright (C) 2003 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+#include <debug/deque>
+#include <testsuite_hooks.h>
+
+using __gnu_debug::deque;
+
+bool test = true;
+
+// Erase
+void test04()
+{
+  deque<int> v(20, 42);
+
+  // Single element erase (middle)
+  deque<int>::iterator before = v.begin();
+  deque<int>::iterator at = before + 3;
+  deque<int>::iterator after = at;
+  at = v.erase(at);
+  VERIFY(before._M_singular());
+  VERIFY(at._M_dereferenceable());
+  VERIFY(after._M_singular());
+
+  // Single element erase (end)
+  before = v.begin();
+  at = before;
+  after = at + 1;
+  at = v.erase(at);
+  VERIFY(before._M_singular());
+  VERIFY(at._M_dereferenceable());
+  VERIFY(after._M_dereferenceable());
+
+  // Multiple element erase
+  before = v.begin();
+  at = before + 3;
+  v.erase(at, at + 3);
+  VERIFY(before._M_singular());
+  VERIFY(at._M_singular());
+
+  // clear()
+  before = v.begin();
+  VERIFY(before._M_dereferenceable());
+  v.clear();
+  VERIFY(before._M_singular());
+}
+
+int main()
+{
+  test04();
+  return !test;
+}