Last chapter on async Rust

exercises/08_futures/04_future/Cargo.toml

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+[package]
+name = "future"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+tokio = { version = "1", features = ["full"] }

exercises/08_futures/04_future/src/lib.rs

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+//! TODO: get the code to compile by **re-ordering** the statements
+//!  in the `example` function. You're not allowed to change the
+//!  `spawner` function nor what each line does in `example`.
+use std::rc::Rc;
+use tokio::task::yield_now;
+
+fn spawner() {
+    tokio::spawn(example());
+}
+
+async fn example() {
+    let non_send = Rc::new(1);
+    yield_now().await;
+    println!("{}", non_send);
+}