CoroutineScope.kt

import kotlinx.coroutines.Deferred
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.async
import kotlinx.coroutines.coroutineScope
import kotlinx.coroutines.delay
import kotlinx.coroutines.runBlocking

fun main() {
    lateinit var a: Deferred<Nothing>
    lateinit var b: Deferred<Unit>
   
        runBlocking { // Parent scope for both calls. When a fails, both coroutines get cancelled.
            a = async { throw RuntimeException() }
            b = async { delay(2000).also { println("I leaked!") } } // Will be printed!
        }

    println(a)
    println(b)
}