@@ -502,7 +502,7 @@ _GLIBCXX_MEM_FN_TRAITS(&&, false_type, true_type)
template<typename _Fn, typename _CallArgs, typename... _BArgs>
using _Res_type_impl
- = typename result_of< _Fn&(_Mu_type<_BArgs, _CallArgs>...) >::type;
+ = typename result_of< _Fn&(_Mu_type<_BArgs, _CallArgs>&&...) >::type;
template<typename _CallArgs>
using _Res_type = _Res_type_impl<_Functor, _CallArgs, _Bound_args...>;
new file mode 100644
@@ -0,0 +1,33 @@
+// Copyright (C) 2017 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/>.
+
+// { dg-do compile { target c++11 } }
+
+#include <functional>
+
+// PR libstdc++/79798
+
+struct X { };
+const X f(int);
+
+struct Y {
+ void operator()(X&&) = delete;
+ int operator()(const X&&);
+};
+
+auto b = std::bind(Y(), std::bind(f, std::placeholders::_1));
+auto i = b(1);