1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <chrono>
11
12// duration
13
14// Period::num shall be positive, diagnostic required.
15
16#include <chrono>
17
18int main()
19{
20    typedef std::chrono::duration<int, std::ratio<5, -1> > D;
21    D d;
22}
23