{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
            let got_lin_col = line_index.to_utf8(enc, wide_lin_col).unwrap();
            let wide_lin_col = line_index.to_wide(enc, lin_col).unwrap();
            assert_eq!(got_lin_col, lin_col);