anchor.diff:    src = fetchurl {
       urls = map (n: "${n}/node-v${version}.tar.xz") dirUrls;
       allowHashOutput = false;
  -    sha256 = "dbaeb8fb68a599e5164b17c74f66d24f424ee4ab3a25d8de8a3c6808e5b42bfb";
  +    sha256 = "2dfeeddba750b52a528b38a1c31e35c1fb40b19cf28fbf430c3c8c7a6517005a";
     };
   
     nativeBuildInputs = [
  
positive.code:       failEarly = true;
        sha256Urls = map (n: "${n}/SHASUMS256.txt.asc") dirUrls;
        #pgpsigSha256Urls = map (n: "${n}.asc") sha256Urls;
        pgpKeyFingerprint = "DD8F 2338 BAE7 501E 3DD5  AC78 C273 792F 7D83 545D";
        inherit (src) urls outputHash outputHashAlgo;
      };
    };
  
negative.code: }:
  
  let
    version = "6.2.2";
  
    dirUrls = [
      "https://nodejs.org/dist/v${version}"
  