* The corresponding extension function gets automatically de-incubated during source generation.
 * But the same applies to the implicit file class, and it has to be de-incubated when any
 * extension function it contains is de-incubated.
 */
private
fun isIncubatingFileClass(targetType: ApiType, extensions: List<KotlinExtensionFunction>): Boolean {
    return targetType.isIncubating || extensions.all { it.isIncubating }
}