val generatedTopLevelClassifiers = declarationGenerators
            .asSequence()
            .flatMap {
                // FIXME this function should be called only once during plugin's lifetime, so this usage is not really correct (2)
                it.getTopLevelClassIds()
            }
            .filter { it.packageFqName == packageFqName }
            .map { it.shortClassName }

        return generatedTopLevelClassifiers.toSet()

- [`KT-49785`](https://youtrack.jetbrains.com/issue/KT-49785) Avoid creating task output backups until really needed
- [`KT-56047`](https://youtrack.jetbrains.com/issue/KT-56047) False positive message about full recompilation is displayed while restoring from build cache and then making a syntax error