fix checks: unused warning

Author: Werner Henze

tests/pointers_tests.cpp

@@ -36,7 +36,7 @@ struct NotMovable
     NotMovable() = default;
     NotMovable(NotMovable&&) = delete;
     NotMovable& operator=(NotMovable&&) = delete;
-} dummy;
+};
 template <typename U, typename = void>
 static constexpr bool SwapCompilesFor = false;
 template <typename U>
@@ -46,3 +46,5 @@ static constexpr bool
 static_assert(!SwapCompilesFor<NotMovable>, "!SwapCompilesFor<NotMovable>");
 
 } // namespace
+
+NotMovable unused_not_movable; // To silence unused-warnings (must not be in anonymous namespace)