practical_coroutines_22.kt

val parentJob = scope.launch {
    val result1 = suspendFunction1()
    var nonCooperativeChildResult = 0
    val nonCooperativeChild = launch {
        while(isActive) {        
             nonCooperativeChildResult = 
                 someRecursiveProcessing(nonCooperativeChildResult)
        }
    }
    val result2 = async { someApiCallWithRetrofit() }
    val result3 = callbackConvertedWithSuspendCancellable()
    var combinedResult = result1 + result2.await() + result3
    nonCooperativeChild.cancel()  
    combinedResult += nonCooperativeChildResult
    processResult(combinedResult)
}
// On cancel button clicked we can do either of the following parentJob.cancel()
scope.cancel()