anchor.diff:            packages.ghc8102Binary
           else
             packages.ghc865Binary;
  -      inherit (buildPackages.python3Packages) sphinx;
  +      inherit sphinx;
         buildTargetLlvmPackages = pkgsBuildTarget.llvmPackages_7;
         llvmPackages = pkgs.llvmPackages_7;
       };
  
positive.code:           packages.ghc8107BinaryMinimal
          else
            packages.ghc8107Binary;
        inherit (buildPackages.python3Packages) sphinx;
        inherit (buildPackages.darwin) autoSignDarwinBinariesHook xattr;
        buildTargetLlvmPackages = pkgsBuildTarget.llvmPackages_12;
        llvmPackages = pkgs.llvmPackages_12;
  
negative.code:   # Use this rather than `rec { ... }` below for sake of overlays.
    inherit (pkgs.haskell) compiler packages;
  
    sphinx = buildPackages.sphinx_offline;
  
  in {
    lib = haskellLibUncomposable;
  
  