error

Common
JVM
JS
Native
1.0
fun error(message: Any): Nothing
(source)

Throws an IllegalStateException with the given message.

import kotlin.test.*

fun main(args: Array<String>) {
//sampleStart
val name: String? = null

// val nonNullName = name ?: error("Name is missing") // will fail with IllegalStateException
//sampleEnd
}