{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"mcx.branch_usefulness.entry(pat.uid).or_default().update(row,"}]}
                mcx.branch_usefulness.entry(pat.uid).or_default().update(row, matrix);
            if let PatOrWild::Pat(pat) = row.head() {
            }