error

kotlin-stdlib / kotlin / error
Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0) 
fun error(message: Any): Nothing

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
}

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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/error.html