How to use a static mutable reference in a loop with async move?

I have code with a mutable reference with the 'static lifetime and I am trying to use it in the loop which has async move:

fn baz(_s: &mut String) {
    // do something
}

fn main() {
    let bar: &'static mut String = Box::leak(Box::new("test".to_string()));
    loop {
        tokio::spawn(async move {
            baz(bar);
        });

        // some conditions here to exit from the loop
    }
}

The Rust compiler suggests reborrowing, but it is syntactically incorrect, the first time I've stumbled on that:

error[E0382]: use of moved value: `bar`
  --> src/main.rs:8:33
   |
6  |       let bar: &'static mut String = Box::leak(Box::new("test".to_string()));
   |           --- move occurs because `bar` has type `&mut String`, which does not implement the `Copy` trait
7  |       loop {
8  |           tokio::spawn(async move {
   |  _________________________________^
9  | |             baz(bar);
   | |                 --- use occurs due to use in generator
10 | |         });
   | |_________^ value moved here, in previous iteration of loop
   |
help: consider creating a fresh reborrow of `bar` here
   |
8  |         tokio::spawn(async move &mut *{
   |                                 ++++++

How I can use this mutable reference in such a loop? I'm fighting against borrowing in the loop and async move wanting to do a copy/clone.