`cabal check` error location not propagated ("unexpected SecArgName")

The syntax error
```
if (base < 4.7)
build-depends:
errorcall-eq-instance == 0.3.*
```
is reported by `cabal check` as follows:
```
Warning: MissingH.cabal:1:1:
unexpected SecArgName (Position 204 7) "base"
Errors encountered when parsing cabal file ./MissingH.cabal:

MissingH.cabal:1:1: error:
unexpected SecArgName (Position 204 7) "base"

1 | cabal-version: 1.12
| ^
Error: cabal: parse error
```

Expected behavior:
- Report error at 204:7 not at 1:1
- User-friendly error message