use of handle!

handle_use.rs

        let result = handle!(result, err, {
            error!("error receiving messages: {}", err);
            continue;
        });
        trace!("got message result");
        for msg in result.messages.unwrap_or_default() {
            let body = msg.body.unwrap();
            let _delete = sqs
                .delete_message(rusoto_sqs::DeleteMessageRequest {
                    queue_url: queue_url.to_owned(),
                    receipt_handle: msg.receipt_handle.unwrap(),
                })
                .sync();
            debug!("got message: {:#?}", body);
            let records = handle!(get_records(body), err, {
                warn!("error getting records: {}", err);
                continue;
            });
            for r in records {
                let event = handle!(parse_record(r), err, {
                    error!("parsing record: {}", err);
                    continue;
                });
                handle!(handle_event(&event, index), err, {
                    error!("error handling event {:?}: {}", event, err);
                    continue;
                });
                info!("handled {:?}", event);
            }
        }