[libcxx] [test] Fix Clang -Wunused-local-typedef, part 3/3.

test/std/strings/string.classes/typedefs.pass.cpp
Actually test what basic_string's typedefs stand for.

test/std/utilities/meta/meta.trans/meta.trans.other/result_of11.pass.cpp
NotDerived and ND were completely unused.

test/std/utilities/utility/pairs/pairs.pair/default.pass.cpp
P2 was mistakenly not being used. Yes, that's
right: -Wunused-local-typedef CAUGHT A MISTAKE! AMAZING!

Fixes D29137.

llvm-svn: 294156

1 files changed, 5 insertions, 4 deletions

diff --git a/libcxx/test/std/strings/string.classes/typedefs.pass.cpp b/libcxx/test/std/strings/string.classes/typedefs.pass.cpp
index 11ee6c8a121..3aba1c3f15d 100644
--- a/libcxx/test/std/strings/string.classes/typedefs.pass.cpp
+++ b/libcxx/test/std/strings/string.classes/typedefs.pass.cpp
@@ -18,13 +18,14 @@
 // typedef basic_string<wchar_t> wstring;
 
 #include <string>
+#include <type_traits>
 
 int main()
 {
-    typedef std::string test1;
-    typedef std::wstring test2;
+    static_assert((std::is_same<std::string, std::basic_string<char> >::value), "");
+    static_assert((std::is_same<std::wstring, std::basic_string<wchar_t> >::value), "");
 #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
-    typedef std::u16string test3;
-    typedef std::u32string test4;
+    static_assert((std::is_same<std::u16string, std::basic_string<char16_t> >::value), "");
+    static_assert((std::is_same<std::u32string, std::basic_string<char32_t> >::value), "");
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
 }