Add to build-depends in your cabal file

[A recent question on stackoverflow](https://stackoverflow.com/q/71283895/15207568) concerns adding dependencies to the cabal file. The error suggests adding a dependency to the `build-depends` field:

```
src\Main.hs:3:2: error:
Could not load module `Text.ParserCombinators.Parsec'
It is a member of the hidden package `parsec-3.1.13.0'.
Perhaps you need to add `parsec' to the build-depends in your .cabal file.
Use -v to see a list of the files searched for.
|
3 | import Text.ParserCombinators.Parsec hiding (spaces)
| ^^
```

However, the .cabal file could contain multiple `build-depends` fields, so it would be useful if the error message could include slightly more information about the build component and perhaps even a line number in the .cabal file.

That does seem to require some coordination between GHC and Cabal. Maybe with structured error messages GHC could provide a generic "package not found" error and then cabal could intercept that and provide detailed information on how to solve that. That seems like quite a big change, so maybe there is an easier solution?