// { dg-options "-std=gnu++17" }
// { dg-do compile { target c++17 } }

// Copyright (C) 2011-2020 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/>.

#include <chrono>
#include <testsuite_common_types.h>
constexpr auto test_operators()
{
  using namespace std::chrono;
  nanoseconds d1 { };
  time_point<system_clock> c1 { };

  c1+=d1;
  c1-=d1;


  return 11;
}

constexpr auto a = test_operators();
