impl log::Log for Logger {
    fn enabled(&self, metadata: &Metadata) -> bool {
        self.dispatches
            .iter()
            .any(|dispatch| dispatch.enabled(metadata))
    }

    fn log(&self, record: &Record) {
        for dispatch in &self.dispatches {
            if let Err(err) = dispatch.log(record) {
                handle_error(record, err);
            }
        }
    }

    fn flush(&self) {
        for dispatch in &self.dispatches {
            dispatch.flush(); <- use a similar pattern to `log`
        }
    }
}