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/iterators/iterator.primitives/iterator.traits/empty.pass.cpp

@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <iterator>
+
+// template<class NotAnIterator>
+// struct iterator_traits
+// {
+// };
+
+#include <iterator>
+
+struct not_an_iterator
+{
+};
+
+template <class _Tp>
+struct has_value_type
+{
+private:
+    struct two {char lx; char lxx;};
+    template <class _Up> static two test(...);
+    template <class _Up> static char test(typename _Up::value_type* = 0);
+public:
+    static const bool value = sizeof(test<_Tp>(0)) == 1;
+};
+
+int main()
+{
+    typedef std::iterator_traits<not_an_iterator> It;
+    static_assert(!(has_value_type<It>::value), "");
+}