/**
     * Returns `true` if the control graph contains at least one of the [firCandidates].
     */
    private fun ControlFlowGraph.contains(firCandidates: Set<FirElement>): Boolean {
        for (node in nodes) {
            if (node.fir in firCandidates) {
                return true
            }
            if (node is CFGNodeWithSubgraphs<*> && node.subGraphs.any { it.contains(firCandidates) }) {
                return true