Merge to upstream r225300.

Change-Id: I2b23715db9ac129ff80aa78ad5824db0a4d6fbb3

test/std/utilities/time/time.duration/ratio.fail.cpp

@@ -0,0 +1,30 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <chrono>
+
+// duration
+
+// Period shall be a specialization of ratio, diagnostic required.
+
+#include <chrono>
+
+template <int N, int D = 1>
+class Ratio
+{
+public:
+    static const int num = N;
+    static const int den = D;
+};
+
+int main()
+{
+    typedef std::chrono::duration<int, Ratio<1> > D;
+    D d;
+}