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diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/open/char/4.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/open/char/4.cc
new file mode 100644
index 00000000..31d25422
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/open/char/4.cc
@@ -0,0 +1,72 @@
+// 2006-10-01  Paolo Carlini  <pcarlini@suse.de>
+
+// Copyright (C) 2006, 2007, 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/>.
+
+// { dg-require-fileio "" }
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+// DR 596.
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  const char* name = "tmp_file4";
+
+  std::fstream scratch_file;
+
+  scratch_file.open(name, std::ios_base::app);
+  VERIFY( scratch_file );
+  VERIFY( scratch_file.is_open() );
+  scratch_file.close();
+
+  scratch_file.open(name, std::ios_base::in | std::ios_base::out
+		    | std::ios_base::app);
+  VERIFY( scratch_file );
+  VERIFY( scratch_file.is_open() );
+  scratch_file.close();
+
+  scratch_file.open(name, std::ios_base::in | std::ios_base::app);
+  VERIFY( scratch_file );
+  VERIFY( scratch_file.is_open() );
+  scratch_file.close();
+
+  scratch_file.open(name, std::ios_base::app | std::ios_base::binary);
+  VERIFY( scratch_file );
+  VERIFY( scratch_file.is_open() );
+  scratch_file.close();
+
+  scratch_file.open(name, std::ios_base::in | std::ios_base::out
+		    | std::ios_base::app | std::ios_base::binary);
+  VERIFY( scratch_file );
+  VERIFY( scratch_file.is_open() );  
+  scratch_file.close();
+
+  scratch_file.open(name, std::ios_base::in | std::ios_base::app
+		    | std::ios_base::binary);
+  VERIFY( scratch_file );
+  VERIFY( scratch_file.is_open() );  
+  scratch_file.close();
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}