anchor.diff:    src = fetchurl {
       urls = map (n: "${n}/node-v${version}.tar.xz") dirUrls;
       hashOutput = false;
  -    sha256 = "656342ed8a84c95a36af902f309aeeca7103b16d61c02925bd37bd47d2194915";
  +    sha256 = "0bdd8d1305777cc8cd206129ea494d6c6ce56001868dd80147aff531d6df0729";
     };
   
     nativeBuildInputs = [
  
positive.code:         "B9AE 9905 FFD7 803F 2571  4661 B63B 535A 4C20 6CA9"
          "FD3A 5288 F042 B685 0C66  B31F 09FE 4473 4EB7 990E"
          "94AE 3667 5C46 4D64 BAFA  68DD 7434 390B DBE9 B9C5"
        ];
        inherit (src) urls outputHash outputHashAlgo;
      };
  
negative.code: }:
  
  let
    version = "6.9.1";
  
    dirUrls = [
      "https://nodejs.org/dist/v${version}"
  