{"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"if"}]}
        if let Some(def_id) = dep_node.extract_def_id(self.tcx) {
    fn dep_node_str(&self, dep_node: &DepNode) -> String {
            format!("{:?}({})", dep_node.kind, self.tcx.def_path_str(def_id))