{"ast_node_type":"variable","tokens":[{"end":60,"kind":"keyword","start":0,"text":"if"}]}
        if let Some(forbidden_edge) = &self.forbidden_edge {
    fn record_edge(&self, dep_node_index: DepNodeIndex, key: DepNode, fingerprint: Fingerprint) {
            forbidden_edge.index_to_node.lock().insert(dep_node_index, key);