7 struct Two : One {  struct
9   constexpr Two() = default;  argument
10   ~Two() override;
20 struct Two {  struct
23   constexpr Two() = default;  argument
24   virtual ~Two();
35 struct Two {  struct
38   constexpr Two() = default;  argument
39   virtual ~Two();
50 struct Two {  struct
52   Two(int member);  argument
54   virtual ~Two();