anchor.diff:          hsPkgs = haskellPackages_ghc763;
       };
   
  -    ghcSpec_783 = {
  -        name = "ghc783";
  -        ghc = ghc.ghc783;
  -        hsPkgs = haskellPackages_ghc783;
  -    };
  -
  -    ghcEnv_783 = ghcEnv ghcSpec_783;
  +    ghcSpec_784 = {
  +        name = "ghc784";
  +        ghc = ghc.ghc784;
  +        hsPkgs = haskellPackages_ghc784;
  +    };
  +
  +    ghcEnv_784 = ghcEnv ghcSpec_784;
   
       ghcEnvBare = myEnvFun {
         name = "ghc78-bare";
  -      buildInputs = [ ghc.ghc783 haskellPackages_ghc783.cabalInstall ];
  +      buildInputs = [ ghc.ghc784 haskellPackages_ghc784.cabalInstall ];
       };
   
       vcsTools = self.buildEnv {
  
positive.code:     ] ++ (with spec.hsPkgs; [
          hlint
          cabalInstall
      ]) ++ (with haskellPackages_ghc783; [
          cabal2nix
          hasktags
          # threadscope # broken 2014-11-19
  
negative.code:         packages = myHaskellPackages spec;
      };
  
      hoogleLocal_784 = myHoogleLocal ghcSpec_784;
  
      };
  }
  