text: #ifndef __cpp_noexcept_function_type
  #  error "Noexcept not part of the type system (__cpp_noexcept_function_type)"
  #endif
  
  #ifndef __cpp_fold_expressions
  #  error "No support for fold expression (__cpp_fold_expressions)"
  #endif
  
  #ifndef __cpp_if_constexpr
  #  error "No support for 'if constexpr' (__cpp_if_constexpr)"
  #endif
  
  int main(int, char**) {
    return 0;
  }
  