fix: change where TaskHandle is borrowed to prevent repeat output fetches

examples/03_fan_in.rs

@@ -29,7 +29,7 @@
 //! ## Key Concepts
 //! - **Fan-in**: Multiple tasks' outputs are consumed by a single downstream task
 //! - **Aggregation**: Combining multiple values into a single result
-//! - **Parameter order**: The order in `.depends_on((a, b, c))` must match
+//! - **Parameter order**: The order in `.depends_on((&a, &b, &c))` must match
 //!   the function signature `fn run(a: &T1, b: &T2, c: &T3)`
 //!
 //! ## Use Cases
@@ -129,7 +129,7 @@ async fn main() {
     // Single downstream task consuming all values
     let profile = dag
         .add_task(BuildProfile)
-        .depends_on((name, age, city, active));
+        .depends_on((&name, &age, &city, &active));
 
     // Run the DAG
     println!("Running fan-in DAG...\n");
@@ -139,5 +139,5 @@ async fn main() {
         .unwrap();
 
     // Print result
-    println!("\n{}", output.get(profile).unwrap());
+    println!("\n{}", output.get(profile));
 }