anchor.diff:    deepseq = null;
     directory = null;
     filepath = null;
  -  bin-package-db = null;
     ghc-boot = null;
     ghc-boot-th = null;
     ghc-compact = null;
  +  ghc-prim = null;
     ghci = null;
  -  ghc-prim = null;
     haskeline = null;
     hpc = null;
     integer-gmp = null;
  
positive.code:   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;
  
negative.code:   parsec = null;
    pretty = null;
    process = null;
    rts = null;
    stm = null;
    template-haskell = null;
    terminfo = null;
  