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kotlinlang

Is there anything like 'daemon coroutine' in `coroutineScope`  that will be cancelled if other things in it are completed? Normally tasks running in `launch`  in it will cause `coroutineScope`  not to return.

one possibility:
```runBlocking {
    val job = Job()
    launch(job) {
        while (true) yield()
    }
    launch(job) {
        delay(5_000)
    }

    delay(100)

    job.cancel()
}
// done in 100ms```

I asked this because I was lazy to write `.cancel()`;
However this seems quite good.

Maybe I could use simple try .. finally...

you shouldn't need try-finally, an exceptional coroutine termination automatically cancels children