anchor.diff:        buildHaskellPackages = bh.packages.ghc7103Binary;
         ghc = bh.compiler.ghc7103Binary;
         compilerConfig = callPackage ../development/haskell-modules/configuration-ghc-7.10.x.nix { };
  +      packageSetConfig = bootstrapPackageSet;
       };
       ghc802 = callPackage ../development/haskell-modules {
         buildHaskellPackages = bh.packages.ghc802;
  
positive.code:   };
  
    callPackage = newScope { inherit haskellLib; };
  
  in rec {
    lib = haskellLib;
  
negative.code:       buildHaskellPackages = bh.packages.ghc821Binary;
        ghc = bh.compiler.ghc821Binary;
        compilerConfig = callPackage ../development/haskell-modules/configuration-ghc-8.2.x.nix { };
        packageSetConfig = bootstrapPackageSet;
      };
      ghc822 = callPackage ../development/haskell-modules {
        buildHaskellPackages = bh.packages.ghc822;
  