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diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/9027.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/9027.cc
new file mode 100644
index 00000000..25f55493
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+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/9027.cc
@@ -0,0 +1,85 @@
+// 2003-05-03  Petur Runolfsson  <peturr02@ru.is>
+
+// Copyright (C) 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <locale>
+#include <fstream>
+#include <cctype>
+#include <testsuite_hooks.h>
+
+class Cvt_to_upper : public std::codecvt<char, char, std::mbstate_t>
+{
+  typedef std::codecvt<char, char, std::mbstate_t> Base;
+
+public:
+  explicit Cvt_to_upper(std::size_t refs = 0)
+  : Base(refs)
+  { }
+
+protected:
+  virtual result
+  do_in(state_type&,
+	const extern_type* from, const extern_type* from_end,
+	const extern_type*& from_next,
+	intern_type* to, intern_type* to_end,
+	intern_type*& to_next) const
+  {
+    while (from < from_end && to < to_end)
+      *to++ = std::toupper(*from++);
+    
+    to_next = to;
+    from_next = from;
+    return from == from_end ? ok : partial;
+  }
+
+  virtual bool
+  do_always_noconv() const throw()
+  {
+    return false;
+  }
+};
+
+// libstdc++/9027
+void test01()
+{
+  using namespace std;
+
+  bool test __attribute__((unused)) = true;
+  const char* name = "filebuf_virtuals-1.txt";
+  locale loc (locale::classic(), new Cvt_to_upper);	
+
+  filebuf fbin;
+  fbin.pubimbue(loc);
+  fbin.open(name, ios_base::in);
+
+  int c;
+  while ((c = fbin.sbumpc()) != EOF)
+    {
+      VERIFY( !islower(c) );
+    }
+  
+  fbin.close();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}