`sending` cancellation handler in `withTaskCancellationHandler`

[vanvoorden (Rick van Voorden)]

@soumyamahunt

The linked doc mentions that cancellation closure is isolated to the passed actor, is the doc incorrect here?

I had a similar question before. Here might be some more clues:

Sendable Closures that are also isolated and synchronous?

In this sample: func isMainThread() -> Bool { return Thread.isMainThread } let task = Task.detached { await withTaskCancellationHandler( operation: { @MainActor in print("operation() started -> isMainActor: \(isMainThread()), thread: \(pthread_self())") try? await Task.sleep(for: .seconds(2)) print("operation() finished -> isMainActor: \(isMainThread()), thread: \(pthread_self())") }, onCancel: { print("onCancel()…