drop-app/src-tauri/utils/src/download_manager_send.rs

#[macro_export]
macro_rules! send {
    ($download_manager:expr, $signal:expr) => {
        $download_manager.send($signal).unwrap_or_else(|_| {
            panic!(
                "Failed to send signal {} to the download manager",
                stringify!(signal)
            )
        })
    };
}