{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"debug!(\"merge_from_succ(ln={:?},"}]}
        debug!("merge_from_succ(ln={:?}, succ={}, changed={})", ln, self.ln_str(succ_ln), changed);
        let changed = self.rwu_table.union(ln, succ_ln);
        changed