fn change(global_state: &mut u32) {
    *global_state += 1;
}

fn main() {
    let mut global_state = 0u32;

    change(&mut global_state);

    println!("Final state: {}", 




global_state);
}

use std::sync::Mutex;

static ARRAY: Mutex<Vec<i32>> = Mutex::new(Vec::new());

fn do_a_call() {
    ARRAY.lock().unwrap().push(1);
}

fn main() {
    do_a_call();
    do_a_call();
    do_a_call();

    let array = ARRAY.lock().unwrap();
    println!("Called {} times: {:?}", array.len(), array);
    drop(array);

    *ARRAY.lock().unwrap() = vec![3, 4, 5];

    println!("New singleton object: {:?}", ARRAY.lock(). unwrap());
}

source: Singleton in Rust / Design Patterns

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