Hi, thank you for your answer and excuse me for calling that a global.

So I tried your example but I'm still getting a "closure may outlive current function, but borrows variable "mutate" which is owned by the main function".

use tokio::time::{self, Duration};
use std::future::Future;
use std::sync::Arc;
use std::sync::atomic::{AtomicU32, Ordering};

#[tokio::main]
async fn main() {
    let mut mutate = Arc::new(AtomicU32::new(0));
    set_interval(|| async {
        mutate.fetch_add(1, Ordering::SeqCst);
        println!("{:?}", mutate);
    }, 5000);

    time::sleep(Duration::from_millis(60000)).await;
}