text: // Copyright (C) 2017-2020 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>
  
  namespace X {
    struct Y { };
    template<typename T> void ref(T) { }
    template<typename T> void cref(T) { }
  }
  
  int main()
  {
    X::Y i;
    std::reference_wrapper<X::Y> r(i);
    ref(r);
    cref(r);
  }
  