anchor.diff:          packages = myHaskellPackages spec;
       };
   
  -    hoogleLocal_783 = myHoogleLocal ghcSpec_783;
  +    hoogleLocal_784 = myHoogleLocal ghcSpec_784;
   
       };
   }
  
positive.code:     ] ++ (with spec.hsPkgs; [
          hlint
          cabalInstall
      ]) ++ (with haskellPackages_ghc783; [
          cabal2nix
          hasktags
          # threadscope # broken 2014-11-19
  
negative.code:         hsPkgs = haskellPackages_ghc763;
      };
  
      ghcSpec_784 = {
          name = "ghc784";
          ghc = ghc.ghc784;
          hsPkgs = haskellPackages_ghc784;
      };
  
      ghcEnv_784 = ghcEnv ghcSpec_784;
  
      ghcEnvBare = myEnvFun {
        name = "ghc78-bare";
        buildInputs = [ ghc.ghc784 haskellPackages_ghc784.cabalInstall ];
      };
  
      vcsTools = self.buildEnv {
  