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diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/3.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/3.cc
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+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/3.cc
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+// 1999-01-17 bkoz test functionality of basic_filebuf for char_type == char
+
+// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 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.
+
+// 27.8.1.1 - Template class basic_filebuf 
+// NB: This file is for testing basic_filebuf with NO OTHER INCLUDES.
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+// libstdc++/2020
+// should be able to use custom char_type, custom traits type
+class gnu_char_type
+{
+  unsigned long character;
+public:
+  // operator ==
+  bool
+  operator==(const gnu_char_type& __lhs) 
+  { return character == __lhs.character; }
+
+  // operator <
+  bool
+  operator<(const gnu_char_type& __lhs) 
+  { return character < __lhs.character; }
+
+  // default ctor
+  gnu_char_type() { }
+
+  // to_char_type
+  gnu_char_type(const unsigned long& __l) : character(__l) { } 
+
+  // to_int_type
+  operator unsigned long() const { return character; }
+};
+
+// char_traits specialization
+struct gnu_char_traits
+{
+  typedef gnu_char_type	char_type;
+  typedef long  		int_type;
+  typedef long 		pos_type;
+  typedef unsigned long 	off_type;
+  typedef long   		state_type;
+  
+  static void 
+  assign(char_type& __c1, const char_type& __c2) { }
+  
+  static bool 
+  eq(const char_type& __c1, const char_type& __c2) { return true; }
+  
+  static bool 
+  lt(const char_type& __c1, const char_type& __c2) { return true; }
+  
+  static int 
+  compare(const char_type* __s1, const char_type* __s2, size_t __n)
+  { return 0; }
+  
+  static size_t
+  length(const char_type* __s) { return 0; }
+  
+  static const char_type* 
+  find(const char_type* __s, size_t __n, const char_type& __a)
+  { return __s; }
+  
+  static char_type* 
+  move(char_type* __s1, const char_type* __s2, size_t __n)
+  { return __s1; }
+  
+  static char_type* 
+  copy(char_type* __s1, const char_type* __s2, size_t __n)
+  { return __s1; }
+  
+  static char_type* 
+  assign(char_type* __s, size_t __n, char_type __a)
+  { return __s; }
+  
+  static char_type 
+  to_char_type(const int_type& __c)
+  { return char_type(); }
+  
+  static int_type 
+  to_int_type(const char_type& __c)
+  { return int_type(); }
+  
+  static bool 
+  eq_int_type(const int_type& __c1, const int_type& __c2)
+  { return true; }
+  
+  static int_type 
+  eof()
+  { return int_type(); }
+  
+  static int_type 
+  not_eof(const int_type& __c)
+  { return int_type(); }
+};
+
+void test07()
+{
+  bool test = true;
+  typedef std::basic_filebuf<gnu_char_type, gnu_char_traits> gnu_filebuf;
+  
+  try
+    { gnu_filebuf obj; }
+  catch(std::exception& obj)
+    { 
+      test = false; 
+      VERIFY( test );
+    }
+}
+
+#if !__GXX_WEAK__
+// Explicitly instantiate for systems with no COMDAT or weak support.
+template 
+  std::basic_streambuf<gnu_char_type>::int_type
+  std::basic_streambuf<gnu_char_type>::_S_pback_size;
+#endif
+
+int main() 
+{
+  test07();
+  return 0;
+}
+
+
+
+// more surf!!!