Calling synchronous function with async let

[John_McCall]

@christopherweems

To the best of my knowledge, any Task created with Task { .. } within the context of a greater task hierarchy is automatically a child of the Task that spawned it and is cancelled (if you check) when the parent is cancelled. It’s only Tasks created with Task.detached { .. } that won’t receive cancellation. But even if the parent is cancelled, your synchronous() method is going to complete execution unless you’re checking for cancellation within it with Task.isCancelled as done in Jon’s someWork(..) example.

Tasks created with Task are not child tasks of the current task, and changes to the current task like cancellation and priority escalation are not propagated to them. Task just copies more of the context of the current task than Task.detached does.

The only true child tasks (currently) are the tasks created by async let and TaskGroup.