Prepitch: `cancel` operator

[DevAndArtist (Adrian Meister)]

Yes please, I would love something like this and also:

• explicit cancellation for [throwing][Discarding]TaskGroup child tasks
• and an async var which can override the binding or unbind it, or even bind it out of line

`async var` and explicit child-task cancellation

Was it ever discussed why structured concurrency only permits cancellation from the root task and if async var would be banned forever? I have a perfect example of a theoretically structured algorithm which does not outlive the parent task, but I can only implement it using an unstructured task, because (a) I cannot spawn a child task, and step over it (async let comes close but it has to be async var) and (b) pick it up later for explicit non-root cancellation when needed. func collectLatest<T…