[libc++][NFC] Format a pait test

I'll be modifying this test in a future PR.

Author: philnik777

libcxx/test/std/utilities/utility/pairs/pairs.pair/ctor.default.pass.cpp

@@ -15,41 +15,42 @@
 // NOTE: The SFINAE on the default constructor is tested in
 //       default-sfinae.pass.cpp
 
-
 #include <utility>
 #include <type_traits>
 #include <cassert>
 
 #include "test_macros.h"
 #include "archetypes.h"
 
-int main(int, char**)
-{
-    {
-        typedef std::pair<float, short*> P;
-        P p;
-        assert(p.first == 0.0f);
-        assert(p.second == nullptr);
-    }
+int main(int, char**) {
+  {
+    typedef std::pair<float, short*> P;
+    P p;
+    assert(p.first == 0.0f);
+    assert(p.second == nullptr);
+  }
 #if TEST_STD_VER >= 11
-    {
-        typedef std::pair<float, short*> P;
-        constexpr P p;
-        static_assert(p.first == 0.0f, "");
-        static_assert(p.second == nullptr, "");
-    }
-    {
-        using NoDefault = ImplicitTypes::NoDefault;
-        using P = std::pair<int, NoDefault>;
-        static_assert(!std::is_default_constructible<P>::value, "");
-        using P2 = std::pair<NoDefault, int>;
-        static_assert(!std::is_default_constructible<P2>::value, "");
-    }
-    {
-        struct Base { };
-        struct Derived : Base { protected: Derived() = default; };
-        static_assert(!std::is_default_constructible<std::pair<Derived, int> >::value, "");
-    }
+  {
+    typedef std::pair<float, short*> P;
+    constexpr P p;
+    static_assert(p.first == 0.0f, "");
+    static_assert(p.second == nullptr, "");
+  }
+  {
+    using NoDefault = ImplicitTypes::NoDefault;
+    using P         = std::pair<int, NoDefault>;
+    static_assert(!std::is_default_constructible<P>::value, "");
+    using P2 = std::pair<NoDefault, int>;
+    static_assert(!std::is_default_constructible<P2>::value, "");
+  }
+  {
+    struct Base {};
+    struct Derived : Base {
+    protected:
+      Derived() = default;
+    };
+    static_assert(!std::is_default_constructible<std::pair<Derived, int> >::value, "");
+  }
 #endif
 
   return 0;