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diff --git a/libstdc++-v3/testsuite/27_io/basic_stringbuf/sputn/char/9404-2.cc b/libstdc++-v3/testsuite/27_io/basic_stringbuf/sputn/char/9404-2.cc
new file mode 100644
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--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_stringbuf/sputn/char/9404-2.cc
@@ -0,0 +1,72 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003, 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/>.
+
+// 27.7.1.3 Overridden virtual functions
+
+#include <sstream>
+#include <testsuite_hooks.h>
+
+bool over_called;
+
+class Derived_stringbuf : public std::stringbuf
+{
+public:
+  int_type overflow(int_type c)
+  {
+    over_called = true;
+    return std::stringbuf::overflow(c);
+  }
+  
+  const char_type* pub_epptr() const
+  {
+    return epptr();
+  }
+  
+  const char_type* pub_pptr() const
+  {
+    return pptr();
+  }
+};
+
+// libstdc++/9404
+void test04()
+{
+  bool test __attribute__((unused)) = true;
+
+  bool over_expected;
+  Derived_stringbuf dsbuf_01;
+
+  // sputn
+  Derived_stringbuf dsbuf_02;
+  over_called = false;
+  dsbuf_02.sputn("sonne's", 7);
+  VERIFY( over_called );
+  over_expected = dsbuf_02.pub_epptr() == dsbuf_02.pub_pptr();
+  over_called = false;
+  dsbuf_02.sputn(" peak", 5);
+  VERIFY( (!over_expected && !over_called)
+	  || (over_expected && over_called) );
+  VERIFY( dsbuf_02.str() == "sonne's peak" ); // Sanity check.
+}
+
+int main() 
+{
+  test04();
+  return 0;
+}