un-comment some test coverage

test/Concurrency/Runtime/async_task_executor_and_serial_executor_nonisolated_async_func.swift

@@ -51,29 +51,29 @@ actor Worker {
   }
 
   func test(_ expectedExecutor: NaiveQueueExecutor) async {
-//    // we are isolated to the serial-executor (!)
-//    dispatchPrecondition(condition: .onQueue(expectedExecutor.queue))
-//    expectedExecutor.preconditionIsolated()
-//
-//    // the nonisolated async func properly executes on the task-executor
-//    await nonisolatedFunc(expectedExecutor: expectedExecutor)
-//
-//    /// the task-executor preference is inherited properly:
-//    async let val = {
-//      dispatchPrecondition(condition: .onQueue(expectedExecutor.queue))
-//      expectedExecutor.preconditionIsolated()
-//      return 12
-//    }()
-//    _ = await val
-//
+    // we are isolated to the serial-executor (!)
+    dispatchPrecondition(condition: .onQueue(expectedExecutor.queue))
+    expectedExecutor.preconditionIsolated()
+
+    // the nonisolated async func properly executes on the task-executor
+    await nonisolatedFunc(expectedExecutor: expectedExecutor)
+
+    // the task-executor preference is inherited properly:
+    async let val = {
+      dispatchPrecondition(condition: .onQueue(expectedExecutor.queue))
+      expectedExecutor.preconditionIsolated()
+      return 12
+    }()
+    _ = await val
+
     // as expected not-inheriting
     _ = await Task.detached {
       dispatchPrecondition(condition: .notOnQueue(expectedExecutor.queue))
     }.value
-//
-//    // we properly came back to the serial executor, just to make sure
-//    dispatchPrecondition(condition: .onQueue(expectedExecutor.queue))
-//    expectedExecutor.preconditionIsolated()
+
+    // we properly came back to the serial executor, just to make sure
+    dispatchPrecondition(condition: .onQueue(expectedExecutor.queue))
+    expectedExecutor.preconditionIsolated()
   }
 }
 
@@ -84,12 +84,8 @@ actor Worker {
     let executor = NaiveQueueExecutor(queue)
 
     await Task(executorPreference: executor) {
-      print(">>> INSIDE TASK")
       let worker = Worker(on: executor)
-      print(">> AFTER WORKER")
       await worker.test(executor)
-      print(">> AFTER TEST()")
     }.value
-    print(">> AFTER TASK.VALUE")
   }
 }