[kotlinTraitDerivedClasses.0.kt] Unclassified usage (7: 12) open class A: X {
[kotlinTraitDerivedClasses.1.kt] Unclassified usage (3: 12) open class B: A() {
[kotlinTraitDerivedClasses.1.kt] Unclassified usage (7: 12) open class C: Y {