result.add(initialClass)

        val queue = ArrayDeque<ClassDescriptor>()
        queue.addLast(initialClass)
        while (queue.isNotEmpty()) {
            val current = queue.removeFirst()
            val supertypes = DescriptorUtils.getSuperclassDescriptors(current)
            supertypes.filterNotTo(queue) { it !in result }
            result.addAll(supertypes)
        }