anchor.diff:    src = fetchurl {
       urls = map (n: "${n}/node-v${version}.tar.xz") dirUrls;
       hashOutput = false;
  -    sha256 = "f99ee74647fe223eb03f2dd1dc6acdc14d9a881621376c848236c8d2ac8afd03";
  +    sha256 = "6ff9042696fff0b49647f5864e71cb495e554e4f66e61443494210f5e16ab4a9";
     };
   
     nativeBuildInputs = [
  
positive.code:         "C4F0 DFFF 4E8C 1A82 3640  9D08 E73B C641 CC11 F4C8"
          # James M Snell
          "71DC FD28 4A79 C3B3 8668  286B C97E C7A0 7EDE 3FC1"
        ];
        inherit (src) urls outputHash outputHashAlgo;
      };
  
negative.code: }:
  
  let
    version = "7.6.0";
  
    dirUrls = [
      "https://nodejs.org/dist/v${version}"
  