canceling_child_coroutine.kt

fun main() = runBlocking {
    val job = launch(CoroutineName("parent")) {
        println("Launching two coroutines...")
        val child1Job = launch {
            println("coroutine1: I'm started")
            delay(2000)
            println("coroutine1: I'm done")
        }
        launch {
            println("coroutine2: I'm started")
            delay(3000)
            println("coroutine2: I'm done")
        }
        delay(1000)
        child1Job.cancel()
    }
    job.join()
}