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diff --git a/libstdc++-v3/testsuite/backward/11460.cc b/libstdc++-v3/testsuite/backward/11460.cc
new file mode 100644
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+++ b/libstdc++-v3/testsuite/backward/11460.cc
@@ -0,0 +1,71 @@
+// { dg-options "-Wno-deprecated" }
+// Copyright (C) 2003, 2004, 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
+// .
+
+#include
+#include
+
+class Buf : public std::strstreambuf
+{
+public:
+ Buf(const char* p, std::streamsize n)
+ : std::strstreambuf(p, n)
+ { }
+
+ int_type pub_pbackfail(int_type c = traits_type::eof())
+ {
+ return pbackfail(c);
+ }
+};
+
+// libstdc++/11460
+void test01()
+{
+ bool test __attribute__((unused)) = true;
+
+ typedef std::strstreambuf::traits_type Traits;
+ const char str[] = "a\xff";
+
+ Buf buf(str, 2);
+
+ Traits::int_type a = Traits::to_int_type('a');
+ VERIFY( buf.sbumpc() == a );
+ VERIFY( buf.sungetc() == a );
+ VERIFY( buf.sbumpc() == a );
+ VERIFY( buf.sputbackc('a') == a );
+ VERIFY( buf.sbumpc() == a );
+ VERIFY( buf.pub_pbackfail() != Traits::eof() );
+ VERIFY( buf.sbumpc() == a );
+ VERIFY( buf.pub_pbackfail(a) == a );
+ buf.sbumpc();
+
+ Traits::int_type xff = Traits::to_int_type('\xff');
+ VERIFY( buf.sbumpc() == xff );
+ VERIFY( buf.sungetc() == xff );
+ VERIFY( buf.sbumpc() == xff );
+ VERIFY( buf.sputbackc('\xff') == xff );
+ VERIFY( buf.sbumpc() == xff );
+ VERIFY( buf.pub_pbackfail() != Traits::eof() );
+ VERIFY( buf.sbumpc() == xff );
+ VERIFY( buf.pub_pbackfail(xff) == xff );
+}
+
+int main()
+{
+ test01();
+ return 0;
+}