--- /dev/null
+// 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003, 2004 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.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <streambuf>
+#include <locale>
+#include <cwchar>
+#include <testsuite_hooks.h>
+
+class MyTraits : public std::char_traits<wchar_t>
+{
+public:
+ static bool eq(wchar_t c1, wchar_t c2)
+ {
+ bool test __attribute__((unused)) = true;
+ VERIFY( c1 != L'X' );
+ VERIFY( c2 != L'X' );
+ return std::char_traits<wchar_t>::eq(c1, c2);
+ }
+};
+
+class MyBuf : public std::basic_streambuf<wchar_t, MyTraits>
+{
+ wchar_t buffer[8];
+
+public:
+ MyBuf()
+ {
+ std::wmemset(buffer, L'X', sizeof(buffer) / sizeof(buffer[0]));
+ std::wmemset(buffer + 2, L'f', 4);
+ setg(buffer + 2, buffer + 2, buffer + 6);
+ }
+};
+
+// libstdc++/9538
+void test08()
+{
+ bool test __attribute__((unused)) = true;
+
+ MyBuf mb;
+ mb.sputbackc(L'a');
+}
+
+int main()
+{
+ test08();
+ return 0;
+}