anchor.diff:    inherit (pkgs) llvmPackages;
   
     # Disable GHC 8.4.x core libraries.
  -  #
  -  # Verify against:
  -  # ls /nix/store/wnh3kxra586h9wvxrn62g4lmsri2akds-ghc-8.4.20180115/lib/ghc-8.4.20180115/ -1 | sort | grep -e '-' | grep -Ev '(txt|h|targets)$'
     array = null;
     base = null;
     binary = null;
  
positive.code:   deepseq = null;
    directory = null;
    filepath = null;
    bin-package-db = null;
    ghc-boot = null;
    ghc-boot-th = null;
    ghc-compact = null;
    ghci = null;
    ghc-prim = null;
    haskeline = null;
    hpc = null;
    integer-gmp = null;
  
negative.code:   parsec = null;
    pretty = null;
    process = null;
    rts = null;
    stm = null;
    template-haskell = null;
    terminfo = null;
  