text: // Copyright (C) 2011-2017 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 <set>
  
  struct X
  {
    template<typename T>
    X(T&) {}
  };
  
  bool operator<(const X&, const X&) { return false; }
  
  // LWG 2059.
  void erasor(std::set<X>& s, X x)
  {
    std::set<X>::iterator it = s.find(x);
    if (it != s.end())
      s.erase(it);
  }
  