Address soundness hole in cycle prevention

src/builder/tests.rs

@@ -76,7 +76,7 @@ fn test_task_builder_depends_on_returns_handle() {
     let dag = DagRunner::new();
 
     let source = dag.add_task(TestTask { value: 10 });
-    let dependent = dag.add_task(TestTaskWithInput).depends_on(&source);
+    let dependent = dag.add_task(TestTaskWithInput).depends_on(source);
 
     // depends_on should return a TaskHandle
     let _handle: TaskHandle<i32> = dependent;
@@ -87,12 +87,12 @@ fn test_task_builder_chain() {
     let dag = DagRunner::new();
 
     // Test chaining multiple tasks
-    let t1 = dag.add_task(TestTask { value: 1 });
-    let t2 = dag.add_task(TestTaskWithInput).depends_on(&t1);
+    let t1 = dag.add_task(TestTask { value: 1 }).into();
+    let t2 = dag.add_task(TestTaskWithInput).depends_on(t1);
     let t3 = dag.add_task(TestTaskWithInput).depends_on(t2);
 
     // All should return TaskHandles
-    let _: TaskHandle<i32> = t1.into();
+    let _: TaskHandle<i32> = t1;
     let _: TaskHandle<i32> = t2;
     let _: TaskHandle<i32> = t3;
 }
@@ -115,7 +115,7 @@ fn test_multiple_dependencies() {
     let b = dag.add_task(TestTask { value: 20 });
 
     // Test multiple dependencies
-    let sum = dag.add_task(AddTask).depends_on((&a, &b));
+    let sum = dag.add_task(AddTask).depends_on((a, b));
 
     // Should return a TaskHandle
     let _: TaskHandle<i32> = sum;