Merge to upstream r225300.

Change-Id: I2b23715db9ac129ff80aa78ad5824db0a4d6fbb3

test/std/strings/basic.string/string.access/db_index.pass.cpp

@@ -0,0 +1,52 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// Index string out of bounds.
+
+#if _LIBCPP_DEBUG >= 1
+
+#define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0))
+
+#include <string>
+#include <cassert>
+#include <iterator>
+#include <exception>
+#include <cstdlib>
+
+#include "min_allocator.h"
+
+int main()
+{
+    {
+    typedef std::string S;
+    S s;
+    assert(s[0] == 0);
+    assert(s[1] == 0);
+    assert(false);
+    }
+#if __cplusplus >= 201103L
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    S s;
+    assert(s[0] == 0);
+    assert(s[1] == 0);
+    assert(false);
+    }
+#endif
+}
+
+#else
+
+int main()
+{
+}
+
+#endif