[Nix-dev] Haskell NG: multiple project usage

[Nikita Karetnikov]

I added a new datatype to tasty-core, which I'd like to use in
tasty-quickcheck.  I generated two default.nix files as described here:

http://stackoverflow.com/questions/27968909/how-to-get-cabal-and-nix-work-together

And put this shell.nix file into the tasty-quickcheck directory:

https://gist.github.com/nkaretnikov/ec2c1765b37b8db2324d

After running nix-shell -I ~ --pure and cabal build in the same
directory, tasty-quickcheck still can't find my datatype.  What's wrong?