I have a custom result-like class that has served me well in kotlin/android;

sealed class Resolved<out T> {
    data class Success<out T>(val data: T) : Resolved<T>()
    data class Error(val exception: Exception) : Resolved<Nothing>()

But in case of Error, how can I extract the exception on the iOS side? If Resolved.Error has a type parameter (Error<T>) i can do in swift:

if

*let* val = response *as*? ResolvedError { ...

But when it doesnt and is typed as Resolved<Nothing> I cannot. Or at least I don't know how. Any tips?