Method check_precision

extlibs/fmt/include/fmt/format.h:2128–2131

  }

  FMT_CONSTEXPR void check_precision() {
    if (is_integral_type(arg_type_) || arg_type_ == type::pointer_type)
      error_handler_.on_error("precision not allowed for this argument type");
  }

 private:
  ErrorHandler& error_handler_;