Move test into test/std subdirectory.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/utilities/utility/pairs/pairs.pair/piecewise.pass.cpp

@@ -0,0 +1,35 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <utility>
+
+// template <class T1, class T2> struct pair
+
+// template <class... Args1, class... Args2>
+//     pair(piecewise_construct_t, tuple<Args1...> first_args,
+//                                 tuple<Args2...> second_args);
+
+#include <utility>
+#include <tuple>
+#include <cassert>
+
+int main()
+{
+#ifndef _LIBCPP_HAS_NO_VARIADICS
+    {
+        typedef std::pair<int, int*> P1;
+        typedef std::pair<int*, int> P2;
+        typedef std::pair<P1, P2> P3;
+        P3 p3(std::piecewise_construct, std::tuple<int, int*>(3, nullptr),
+                                        std::tuple<int*, int>(nullptr, 4));
+        assert(p3.first == P1(3, nullptr));
+        assert(p3.second == P2(nullptr, 4));
+    }
+#endif  // _LIBCPP_HAS_NO_VARIADICS
+}