// see the complete implementation at
// https://gist.github.com/objcode/7ab4e7b1df8acd88696cb0ccecad16f7
suspend fun cancelPreviousThenRun(block: suspend () -> T): T {
   // If there is an activeTask, cancel it because it's result is no longer needed
   activeTask?.cancelAndJoin()
   
   // ...