Property file name for enclosed classes.

[bennyhuo]

@DeepCopy
data class Team2(val name: String, val workers: List<Worker2>, val pair: Pair<String, Worker2>, val map: Map<String, Worker2>){
    @DeepCopy
    data class Worker2(val name: String)
}

The name of the file generated is Worker2$$DeepCopy.kt which may conflict with a top-level class Worker2.