Method new_instance

tests/test_class.cpp:99–103

        NoConstructorNew(const NoConstructorNew &) = default;
        NoConstructorNew(NoConstructorNew &&) = default;
        static NoConstructorNew *new_instance() {
            auto *ptr = new NoConstructorNew();
            print_created(ptr, "via new_instance");
            return ptr;
        }
        ~NoConstructorNew() { print_destroyed(this); }
    };