val callStackTrace: Any?,
  ) : WeakReference<RealCall>(referent)

  private companion object {
    val eventListenerUpdater: AtomicReferenceFieldUpdater<RealCall, EventListener> =
      AtomicReferenceFieldUpdater.newUpdater(
        RealCall::class.java,
        EventListener::class.java,
        "eventListener",
      )
  }