bug#53655: haskell build system cannot build attoparsec

[Philip Munksgaard]

On Wed, 23 Feb 2022, at 11:02, zimoun wrote:
> It is 2 different issues; therefore I propose to keep them separated.

Yes, I agree, sorry for the confusion. 

> Let focus on this one…
>
>> When trying to build this file however, I get the following error:
>>
>> ```
>> running "runhaskell Setup.hs" with command "register" and parameters 
>> ("--gen-pkg-config=/gnu/store/25ql0xsjqf0alrvy6hmpw6gzirzbqfmv-ghc-attoparsec-0.14.4/ghc-attoparsec-0.14.4.conf")
>> error: in phase 'register': uncaught exception:
>> ```
>
> …for this bug report.  Hum, I do not know how where the error comes
> from.
>

And yes, this is indeed the issue I'm mostly concerned about.  It seems like 
`/gnu/store/25ql0xsjqf0alrvy6hmpw6gzirzbqfmv-ghc-attoparsec-0.14.4/ghc-attoparsec-0.14.4.conf`
 is expected to be a file, while it is in fact a directory. I'm not sure what 
that means or why it is important though.