Recommit <chrono> changes with a couple xtra tests marked to fail on apple's clang. Reviewed as D51762
llvm-svn: 344627
diff --git a/libcxx/test/std/utilities/time/years.pass.cpp b/libcxx/test/std/utilities/time/years.pass.cpp
new file mode 100644
index 0000000..ad68e64
--- /dev/null
+++ b/libcxx/test/std/utilities/time/years.pass.cpp
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// 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.
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <chrono>
+
+// using years = duration<signed integer type of at least 17 bits, ratio_multiply<ratio<146097, 400>, days::period>>
+
+#include <chrono>
+#include <type_traits>
+#include <limits>
+
+int main()
+{
+ typedef std::chrono::years D;
+ typedef D::rep Rep;
+ typedef D::period Period;
+ static_assert(std::is_signed<Rep>::value, "");
+ static_assert(std::is_integral<Rep>::value, "");
+ static_assert(std::numeric_limits<Rep>::digits >= 17, "");
+ static_assert(std::is_same_v<Period, std::ratio_multiply<std::ratio<146097, 400>, std::chrono::days::period>>, "");
+}