anchor.diff:    src = fetchurl {
       urls = tarballUrls version;
       allowHashOutput = false;
  -    sha256 = "db53c025f2ac3d217bcf753dad6dee7b410b33d0948495ff015aaf8b91189ce2";
  +    sha256 = "dad398ccd5b9faca6b0ab219a036453f62a602a56203ac659b43e889bec35533";
     };
   
     # We need to directly reference coreutils, otherwise the
  
positive.code: }:
  
  let
    version = "3.4";
  
    tarballUrls = version: [
      "mirror://gnu/diffutils/diffutils-${version}.tar.xz"
  
negative.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "3.5";
        pgpsigUrls = map (n: "${n}.sig") urls;
        pgpKeyFingerprint = "155D 3FC5 00C8 3448 6D1E  EA67 7FD9 FCCB 000B EEEE";
        inherit (src) outputHashAlgo;
        outputHash = "dad398ccd5b9faca6b0ab219a036453f62a602a56203ac659b43e889bec35533";
      };
    };
  
  