[Nix-dev] GHC pointed at the wrong package

[Mateusz Kowalczyk]

On 08/23/2014 01:02 PM, Mateusz Kowalczyk wrote:
> Hi,
> 
>>From about 2 days ago, I started having a problem of the following nature:
> 
> There are problems in package regex-tdfa-1.2.0:
>   dependency "parsec-3.1.5-ca5ed8f175b69e1a085cfeaf3b95f424" doesn't exist
> There are problems in package regex-tdfa-rc-1.1.8.3:
>   dependency "parsec-3.1.5-ca5ed8f175b69e1a085cfeaf3b95f424" doesn't exist
> 
> As you can see at [1], I *do* have parsec-3.1.5 in the checked database
> but the package ID doesn't match up. I don't know how I got into this
> situation and I also don't know how to get out of it. I think this
> started happening after I updated my channel.
> 
> I have collected garbage earlier today, went into the nix-shell --pure
> --dry-run and confirmed that the regex-tdfa packages weren't there
> anymore and the shell wasn't broken but after nix-shell --pure, the
> dependencies install and the problem comes back.
> 
> I hoped that I would never have such problems anymore so it's a bit
> disappointing.
> 
> Please feel free to request extra info.
> 
> [1]: http://lpaste.net/109873
> 

Even a simple

nix-shell -p pkgs.haskellPackages_ghc783.regexTdfa -p
pkgs.haskellPackages_ghc783.ghc --pure

Replicates the problem. Might want to add .parsec in there.

-- 
Mateusz K.