{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"graph.successors.entry(source).or_default().push(target);"}]}
            graph.successors.entry(source).or_default().push(target);
            graph.num_nodes = max(graph.num_nodes, target + 1);
            graph.predecessors.entry(target).or_default().push(source);