[MC-170124] Compound filters in the NBT path can be followed by an array index

To Reproduce

```
/data get entity @s {}[]
```

Expected

Reports syntax error. Because if something matches a compound filter, it must be a TAG_Compound. You would never get something by using index from a TAG_Compound.

Actual

❌ No syntax error was reported.

Linked issues

relates to 1

MC-208974 Target NBT is changed despite being reported as unchanged Open

Comments 5

Avoma 2021-01-09T11:59:06Z

Can confirm in 20w51a.

Avoma 2021-01-22T16:09:43Z

Can confirm in 21w03a.

intsuc 2021-06-06T01:18:21Z

For the same reason, [{}][] should also report a syntax error.
MC-208974 can be statically prevented if both {}[] and [{}][] become invalid syntax.

Avoma 2022-07-04T18:59:17Z

Can confirm in 1.19.

Avoma 2022-09-13T15:47:22Z

Can confirm in 1.19.2.