成员的完整列表，这些成员属于 resumef::awaitable_impl_t< _Ty >,包括所有继承而来的类成员

_state	resumef::awaitable_impl_t< _Ty >	mutable
get_future() noexcept	resumef::awaitable_impl_t< _Ty >	inline
set_exception(std::exception_ptr e) const	resumef::awaitable_impl_t< _Ty >	inline
throw_exception(_Exp e) const	resumef::awaitable_impl_t< _Ty >	inline