Remove expects from demo

examples/demo.rs

@@ -1,7 +1,7 @@
 use std::time::Duration;
 use tracing_subscriber::{fmt, prelude::*, EnvFilter};
 
-fn main() {
+fn main() -> Result<(), Box<dyn std::error::Error>> {
     tracing_subscriber::registry()
         .with(fmt::layer())
         .with(EnvFilter::from_default_env())
@@ -11,8 +11,7 @@ fn main() {
         .min_threads(1)
         .max_threads(10)
         .buffer_multiplier(8)
-        .build()
-        .expect("Valid configuration");
+        .build()?;
 
     smol::block_on(async {
         // scale up
@@ -37,7 +36,7 @@ fn main() {
             .collect();
 
         for task in tasks {
-            let i = task.await.expect("Got value");
+            let i = task.await?;
             tracing::info!("Awaited {i}");
         }
 
@@ -46,10 +45,10 @@ fn main() {
             pool.spawn(move || {
                 std::thread::sleep(Duration::from_millis(400));
             })
-            .await
-            .expect("Got value");
+            .await?;
         }
 
         assert!(pool.close().await);
+        Ok(())
     })
 }