anchor.diff:  }:
   
   let
  -  version = "6.9.1";
  +  version = "7.0.0";
   
     dirUrls = [
       "https://nodejs.org/dist/v${version}"
  
positive.code:       sha256Urls = map (n: "${n}/SHASUMS256.txt.asc") dirUrls;
        #pgpsigSha256Urls = map (n: "${n}.asc") sha256Urls;
        pgpKeyFingerprints = [
          "DD8F 2338 BAE7 501E 3DD5  AC78 C273 792F 7D83 545D"
          "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"
          "C4F0 DFFF 4E8C 1A82 3640  9D08 E73B C641 CC11 F4C8"
        ];
        inherit (src) urls outputHash outputHashAlgo;
      };
  
negative.code:   src = fetchurl {
      urls = map (n: "${n}/node-v${version}.tar.xz") dirUrls;
      hashOutput = false;
      sha256 = "e16c3c76c2d6756bbfd711189cbdaf5676049b443e6817007bb537f243ca899a";
    };
  
    nativeBuildInputs = [
  