anchor.diff:    src = fetchurl {
       urls = tarballUrls version;
       hashOutput = false;
  -    sha256 = "92d0fa1c311cacefa89853bdb53c62f4110cdfda3820346b59cbd098f40f955e";
  +    sha256 = "e831b3a86091496cdba720411f9748de81507798f6130adeaef872d206e1b057";
     };
   
     buildInputs = [
  
positive.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "8.29";
        pgpsigUrls = map (n: "${n}.sig") urls;
        pgpKeyFingerprint = "6C37 DC12 121A 5006 BC1D  B804 DF6F D971 3060 37D9";
        inherit (src) outputHashAlgo;
        outputHash = "92d0fa1c311cacefa89853bdb53c62f4110cdfda3820346b59cbd098f40f955e";
      };
    };
  
  
negative.code:     "mirror://gnu/coreutils/coreutils-${version}.tar.xz"
    ];
  
    version = "8.30";
  in
  stdenv.mkDerivation rec {
    name = "coreutils-${version}";
  