{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"self.0.successors(node).chain(self.0.predecessors(node))"}]}
            self.0.successors(node).chain(self.0.predecessors(node))
        fn successors(&self, node: Self::Node) -> impl Iterator<Item = Self::Node> {
        }