obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
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1 files changed, 148 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs-3.cc b/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs-3.cc
new file mode 100644
index 000000000..2fea52eed
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/reference_wrapper/typedefs-3.cc
@@ -0,0 +1,148 @@
+// { dg-options "-std=gnu++0x" }
+// { dg-do compile }
+
+// Copyright (C) 2011 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/>.
+
+#include <functional>
+#include <type_traits>
+
+struct S { };
+
+struct S0
+{
+  typedef int argument_type;
+};
+
+struct S1
+{
+  typedef float first_argument_type;
+};
+
+struct S2
+{
+  typedef char second_argument_type;
+};
+
+struct S01 : S0, S1 { };
+struct S02 : S0, S2 { };
+struct S12 : S1, S2 { };
+
+struct S012 : S0, S1, S2 { };
+
+using std::__sfinae_types;
+using std::integral_constant;
+using std::remove_cv;
+
+_GLIBCXX_HAS_NESTED_TYPE(argument_type)
+_GLIBCXX_HAS_NESTED_TYPE(first_argument_type)
+_GLIBCXX_HAS_NESTED_TYPE(second_argument_type)
+
+template<typename T>
+  struct has_arg_type : __has_argument_type<T>
+  { };
+
+template<typename T>
+  struct has_1st_arg_type : __has_first_argument_type<T>
+  { };
+
+template<typename T>
+  struct has_2nd_arg_type : __has_second_argument_type<T>
+  { };
+
+template<typename T, bool = has_arg_type<T>::value>
+struct test_arg_type
+{
+  static_assert( !has_arg_type<std::reference_wrapper<T>>::value,
+      "reference_wrapper has no nested argument_type");
+};
+
+template<typename T>
+struct test_arg_type<T, true>
+{
+  typedef std::reference_wrapper<T> ref;
+
+  static_assert( has_arg_type<ref>::value,
+      "reference_wrapper has nested argument_type");
+
+  static_assert(
+      std::is_same< typename T::argument_type,
+                    typename ref::argument_type >::value,
+      "reference_wrapper has the correct argument_type");
+};
+
+template<typename T,
+         bool = has_1st_arg_type<T>::value && has_2nd_arg_type<T>::value>
+struct test_1st_2nd_arg_types
+{
+  typedef std::reference_wrapper<T> ref;
+
+  static_assert( !has_1st_arg_type<ref>::value,
+      "reference_wrapper has no nested first_argument_type");
+
+  static_assert( !has_2nd_arg_type<ref>::value,
+      "reference_wrapper has no nested second_argument_type");
+};
+
+template<typename T>
+struct test_1st_2nd_arg_types<T, true>
+{
+  typedef std::reference_wrapper<T> ref;
+
+  static_assert( has_1st_arg_type<ref>::value,
+      "reference_wrapper has nested first_argument_type");
+
+  static_assert( has_2nd_arg_type<ref>::value,
+      "reference_wrapper has nested second_argument_type");
+
+  static_assert(
+      std::is_same< typename T::first_argument_type,
+                    typename ref::first_argument_type>::value,
+      "reference_wrapper has correct first_argument_type");
+
+  static_assert(
+      std::is_same< typename T::second_argument_type,
+                    typename ref::second_argument_type>::value,
+      "reference_wrapper has correct second_argument_type");
+};
+
+
+template<typename T>
+  void test()
+  {
+    test_arg_type<T> t;
+    test_arg_type<const T> tc;
+    test_arg_type<volatile T> tv;
+    test_arg_type<const volatile T> tcv;
+    test_1st_2nd_arg_types<T> t12;
+    test_1st_2nd_arg_types<const T> t12c;
+    test_1st_2nd_arg_types<volatile T> t12v;
+    test_1st_2nd_arg_types<const volatile T> t12cv;
+  }
+
+int main()
+{
+  test<S>();
+  test<S0>();
+  test<S1>();
+  test<S2>();
+  test<S01>();
+  test<S02>();
+  test<S12>();
+  test<S012>();
+}
+