<How does Kotlin's data class copy idiom look for ...

# stackoverflow

[user]

How does Kotlin's data class copy idiom look for nullable types?
I have some code which looks like this, where param is of a data class type:
val options = if (param.language == null) {
param.copy(language = default())
} else {
param
}

Now, however, the language object has been moved into a hierarchy of nullable objects, so the check must look like this:
if (param.subObj?.nextObj?.language == null) { ... }

How do I use the copy idiom in this case?