Function make_error_code

extern/simple_enum/generic_error_category.hpp:91–94

 */
template<concepts::error_enum ErrorEnum>
inline auto make_error_code(ErrorEnum e) -> std::error_code
  {
  return {static_cast<int>(e), generic_error_category<ErrorEnum>::instance()};
  }

using cxx23::bad_expected_access;
using cxx23::expected;