anchor.diff:    passthru = {
       srcVerification = fetchurl rec {
         failEarly = true;
  -      urls = tarballUrls "2.1.23";
  +      urls = tarballUrls "2.2.0";
         pgpsigUrl = map (n: "${n}.sig") urls;
         pgpKeyFingerprints = [
           "D869 2123 C406 5DEA 5E0F  3AB5 249B 39D2 4F25 E3B6"
  
positive.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "a94476391595e9351f219188767a9d6ea128e83be5ed3226a7890f49aa2d0d77";
    };
  
    nativeBuildInputs = [
  
negative.code:         "D238 EA65 D64C 67ED 4C30  73F2 8A86 1B1C 7EFD 60D9"
          "46CC 7308 65BB 5C78 EBAB  ADCF 0437 6F3E E085 6959"
        ];
        sha256 = "d4514a0be0f7a1ff263193330019eb4b53c82f0f5e230af3c14df371271a45e6";
      };
    };
  
  