| // TARGET_BACKEND: JVM | |
| fun box(): String = | |
| object : A<Void, Void>() { | |
| override fun f(vararg params: Void): Void? = null | |
| }.execute() | |
| abstract class A<P, R> { | |
| protected abstract fun f(vararg params: P): R? | |
| fun execute(vararg params: P): String = | |
| if (f(*params) == null) "OK" else "Fail" | |
| } |