rust async hashmap map update

main.rs

use std::collections::hash_map::Entry;
use std::collections::HashMap;
use tokio::runtime::Runtime;

async fn get_from_store(key: String) -> String {
    // pretend to get this from an async sqlx db call
    String::from(format!("value-for-{key}"))
}

async fn do_work() {
    let mut map: HashMap<String, String> = HashMap::new();

    async fn run(key: String, mut map: HashMap<String, String>) -> HashMap<String, String> {
        let val = match map.entry(key.clone()) {
            Entry::Vacant(entry) => {
                println!("insert");
                let v = get_from_store(key.clone()).await;
                entry.insert(v.clone());
                v
            }
            Entry::Occupied(entry) => String::from(entry.get()),
        };
        println!("processed val {val}");
        map
    }

    map = run(String::from("one"), map).await;
    map = run(String::from("two"), map).await;
    map = run(String::from("two"), map).await;
    map = run(String::from("three"), map).await;
    map = run(String::from("one"), map).await;

    for (key, value) in &map {
        println!("{}: {}", key, value);
    }
}

fn main() {
    let runtime = Runtime::new().unwrap_or_else(|e| panic!("Haha: {e}"));
    let result = do_work();
    match runtime.block_on(result) {
        _ => {}
    }
}