40     const char *_v{nullptr};  member
42     constexpr explicit udt1(const char *v) noexcept : _v(v) {}  in udt1()
43     constexpr udt1(udt1 &&o) noexcept : _v(o._v) { o._v = nullptr; }  in udt1()
47       _v = o._v;  in operator =()
48       o._v = nullptr;  in operator =()
52     constexpr const char *operator*() const noexcept { return _v; }  in operator *()
56     const char *_v{nullptr};  member
58     constexpr explicit udt2(const char *v) noexcept : _v(v) {}  in udt2()
59     constexpr udt2(udt2 &&o) noexcept : _v(o._v) { o._v = nullptr; }  in udt2()
63       _v = o._v;  in operator =()
64       o._v = nullptr;  in operator =()
68     constexpr const char *operator*() const noexcept { return _v; }  in operator *()