Nofib test suite requires regex-compat

[zachsully]

I was hoping that I could simply do

(hspkgs.shellFor rec {
  packages = pkgset: [ hsdrv hspkgs.regex-compat ];

to accomplish this. However, in doing this only regex-base and regex-posix (i.e. regex-compat deps) were in the ghc-pkg list. Not being very familiar with the haskell-nix infrastructure, I am not sure if this is an issue with your code or in the larger haskell tooling for nix.

Strangely, I was able to add regex-compat to my ghc environment by including a package that has it as a dependency.

  packages = pkgset: [ hsdrv
    hspkgs.aeson-schema # why do I have this here? because it contains
                        # regex-compat as a dependency and for some reason
                        # package dependencies aren't working properly
    ];