config.nix - haskell override

gistfile1.txt

{
    haskell = super.haskell // {
      packages = super.haskell.packages // {
        lts = super.haskell.packages.lts.override {
          overrides = self: super: {
            heist = super.heist.overrideDerivation (old: {
              doCheck = false;
              testToolDepends = [ super.pandoc ];
            });
          };
        };
      };
    };
  };
}