39   constexpr _Derived& __derived() noexcept {  in __derived()  function
45   constexpr _Derived const& __derived() const noexcept {  in __derived()  function
55     return ranges::begin(__derived()) == ranges::end(__derived());  in empty()
62     return ranges::begin(__derived()) == ranges::end(__derived());  in empty()
70     return !ranges::empty(__derived());
78     return !ranges::empty(__derived());
86     return std::to_address(ranges::begin(__derived()));  in data()
94     return std::to_address(ranges::begin(__derived()));  in data()
102     return ranges::end(__derived()) - ranges::begin(__derived());  in size()
110     return ranges::end(__derived()) - ranges::begin(__derived());  in size()
120     return *ranges::begin(__derived());  in decltype()
130     return *ranges::begin(__derived());  in decltype()
140     return *ranges::prev(ranges::end(__derived()));  in decltype()
150     return *ranges::prev(ranges::end(__derived()));  in decltype()
157     return ranges::begin(__derived())[__index];  in decltype()
164     return ranges::begin(__derived())[__index];  in decltype()