Just wanted to share this slight modification on the <a target="_blank" href="https://doc.rust-lang.org/nightly/std/thread/fn.scope.html">documented example</a>. I just added some <code>dbg!</code> calls and put the example in a main function, but now you can try this with copy and paste into your <code>main.rs</code> for a new cargo project.
<pre><code class="lang-rust">use std::thread;

fn main() {
 let mut a = vec![1, 2, 3];
 let mut x = 0;

 dbg!(&amp;x);

 thread::scope(|s| {
 s.spawn(|| {
 println!("hello from the first scoped thread");
 dbg!(&amp;a);
 });
 s.spawn(|| {
 println!("hello from the second scoped thread");
 x += a[0] + a[2];
 });
 println!("hello from the main thread");
 });

 a.push(4);
 assert_eq!(x, a.len());
 dbg!(&amp;a);
 dbg!(&amp;x);
}
</code></pre>
Further reading: <a href="https://wishawa.github.io/posts/thread-scoped-async/" class="autolinkedURL autolinkedURL-url" target="_blank">wishawa.github.io/posts/thread-scoped-async</a>

Just wanted to share this slight modification on the [documented example](https://doc.rust-lang.org/nightly/std/thread/fn.scope.html).  I just added some `dbg!` calls and put the example in a main function, but now you can try this with copy and paste into your `main.rs` for a new cargo project.


```rust
use std::thread;

fn main() {
    let mut a = vec![1, 2, 3];
    let mut x = 0;

    dbg!(&x);

    thread::scope(|s| {
        s.spawn(|| {
            println!("hello from the first scoped thread");
            dbg!(&a);
        });
        s.spawn(|| {
            println!("hello from the second scoped thread");
            x += a[0] + a[2];
        });
        println!("hello from the main thread");
    });

    a.push(4);
    assert_eq!(x, a.len());
    dbg!(&a);
    dbg!(&x);
}

``` 

Further reading: https://wishawa.github.io/posts/thread-scoped-async/


Rust scoped threads are back