thorimur 182270f8bf

fix: typo in withSetOptionIn (#3806) ...

When using `withSetOptionIn` on syntax `set_option ... in <command>`,
recurse into command syntax (`stx[2]`) instead of the syntax `in`
(`stx[1]`).

---

Demonstration of `stx[1]` vs. `stx[2]`:
```lean
import Lean

def stx := (Lean.Unhygienic.run `(set_option trace.debug true in #print foo)).raw

#eval stx[1] -- Lean.Syntax.atom (Lean.SourceInfo.none) "in"
#eval stx[2] -- `#print` command syntax
```

2024-04-06 18:00:34 +00:00

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