// { dg-do compile { target c++11 } }
// 2008-07-31 Chris Fairles <chris.fairles@gmail.com>

// Copyright (C) 2008-2021 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 <ratio>
#include <chrono>

void test01()
{
  // Check if period is positive
  typedef int rep_type;
  typedef std::ratio<-1> period_type;
  typedef std::chrono::duration<rep_type, period_type> test_type;
  test_type d;  // { dg-error "required from here" }
}

// { dg-error "period must be positive" "" { target *-*-* } 0 }