| tst.js:1:12:1:17 | [x, y] | 0 | tst.js:1:13:1:13 | x |
| tst.js:1:12:1:17 | [x, y] | 1 | tst.js:1:16:1:16 | y |
| tst.js:2:6:2:15 | [a, [, c]] | 0 | tst.js:2:7:2:7 | a |
| tst.js:2:6:2:15 | [a, [, c]] | 1 | tst.js:2:10:2:14 | [, c] |
| tst.js:2:10:2:14 | [, c] | 1 | tst.js:2:13:2:13 | c |