anchor.diff:        inherit (buildPackages.python3Packages) sphinx;
         buildLlvmPackages = buildPackages.llvmPackages_10;
         llvmPackages = pkgs.llvmPackages_10;
  -    } // muslArgs);
  -    ghcHEAD = callPackage ../development/compilers/ghc/head.nix ({
  +    };
  +    ghcHEAD = callPackage ../development/compilers/ghc/head.nix {
         bootPkgs = packages.ghc901; # no binary yet
         inherit (buildPackages.python3Packages) sphinx;
         buildLlvmPackages = buildPackages.llvmPackages_10;
         llvmPackages = pkgs.llvmPackages_10;
         libffi = pkgs.libffi;
  -    } // muslArgs);
  +    };
   
       # The integer-simple attribute set contains all the GHC compilers
       # build with integer-simple instead of integer-gmp.
  
positive.code:       inherit (buildPackages.python3Packages) sphinx;
        buildLlvmPackages = buildPackages.llvmPackages_9;
        llvmPackages = pkgs.llvmPackages_9;
      } // muslArgs);
      ghc901 = callPackage ../development/compilers/ghc/9.0.1.nix ({
        # aarch64 ghc8102Binary exceeds max output size on hydra
        bootPkgs = if stdenv.isAarch64 || stdenv.isAarch32 then
            packages.ghc8102BinaryMinimal
  
negative.code:   # Use this rather than `rec { ... }` below for sake of overlays.
    inherit (pkgs.haskell) compiler packages;
  
  in {
    lib = haskellLib;
  
  