Test case for r183481.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@183522 91177308-0d34-0410-b5e6-96231b3b80d8

test/containers/sequences/vector/const_value_type.pass.cpp

@@ -0,0 +1,20 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <vector>
+
+// vector<const int> v;  // an extension
+
+#include <vector>
+#include <type_traits>
+
+int main()
+{
+    std::vector<const int> v = {1, 2, 3};
+}