main.rs

    fn request_temp_code() -> TempCode {
        Command::new("xdg-open").arg(format!("https://slack.com/oauth/authorize?client_id={}", SLACK_CLIENT_ID)).output().unwrap();
        let server = Server::http(Ipv4Addr(127, 0, 0, 1), 9999);

        let (tx, rx) = channel();
        let mtx = Mutex::new(tx);

        let mut guard = server.listen(move |req: Request, res: Response| {
            match req.uri {
                AbsolutePath(path) => {
                    // Trying to manually drop to see if this is the problem
                    let tempcode = extract_temp_code(&path).unwrap();
                    let gmtx = mtx.lock().unwrap();
                    gmtx.send(tempcode).unwrap();
                    drop(gmtx);
                },
                _ => ()
            }

            let mut res = res.start().unwrap();
            res.write_all(b"Thanks! Please return to Lax").unwrap();
            res.end().unwrap();
        }).unwrap();

        let tempcode = rx.recv().unwrap();
        guard.close();
        println!("{}", "Auth code received!");
        println!("{}", "Server closed!");
        // Hangs here
        tempcode
    }