{"ast_node_type":"variable","tokens":[{"end":76,"kind":"keyword","start":0,"text":"let"}]}
            let dependents = query.transitive_predecessors(source_dep_node);
        for &(_, source_def_id, ref source_dep_node) in if_this_changed {
            for &(target_span, ref target_pass, _, ref target_dep_node) in then_this_would_need {