Joining threads when they fall out of scope:
```rust extern crate drop_guard;
use drop_guard::DropGuard;
use std::thread::{spawn, sleep}; use std::time::Duration;
fn main() { // The guard must have a name. _ will drop it instantly, which would lead to unexpected results let g = DropGuard::new(spawn(move || { sleep(Duration::fromsecs(2)); println!("println! from thread"); }) , |joinhandle| joinhandle.join().unwrap());
println!("Waiting for thread ...");
} ```
Feel free to run the included examples:
bash
cargo run --example rainbow
cargo run --example thread
cargo run --example threadpool