SealedHierarchyNestedErrors.kt

sealed class GetMagicCardUseCaseError {
    
    object InvalidCardNameFormat : GetMagicCardUseCaseError()

    sealed class ApiCallError : GetMagicCardUseCaseError() {
        class HttpUnsuccessfulCodeError(val httpCode: Int) : ApiCallError()
        object RemoteServerNotReachedError : ApiCallError()
        object UnexpectedApiCommunicationError : ApiCallError()
    }
}

// Then handling one error would mean:

fun handleGetMagicCardUseCaseError(error: GetMagicCardUseCaseError) {
    when (error) {
        is GetMagicCardUseCaseError.ApiCallError.HttpUnsuccessfulCodeError -> //TODO
        is GetMagicCardUseCaseError.ApiCallError.RemoteServerNotReachedError -> //TODO
        is GetMagicCardUseCaseError.ApiCallError.UnexpectedApiCommunicationError -> //TODO
        is GetMagicCardUseCaseError.InvalidCardNameFormat -> //TODO
    }
}