// !LANGUAGE: +InlineClasses
// IGNORE_BACKEND_FIR: JVM_IR

inline class A(val s: String)

abstract class B<T> {
    abstract fun f(x: T): T
}

class C: B<A>() {
    override fun f(x: A): A = x
}

fun box(): String {
    return C().f(A("OK")).s
}