Method on_dynamic_precision

extlibs/fmt/include/fmt/format.h:2218–2221

  }

  template <typename Id> FMT_CONSTEXPR void on_dynamic_precision(Id arg_id) {
    this->specs_.precision = get_dynamic_spec<precision_checker>(
        get_arg(arg_id), context_.error_handler());
  }

  void on_error(const char* message) { context_.on_error(message); }