anchor.diff:  { stdenv
   , fetchurl
  -, lzip
   }:
   
   let
  -  version = "2.0.3";
  +  version = "2.0.4";
   
     tarballUrls = version: [
  -    "mirror://gnu/libidn/libidn2-${version}.tar.lz"
  +    "mirror://gnu/libidn/libidn2-${version}.tar.gz"
     ];
   in
   stdenv.mkDerivation rec {
  
positive.code:   passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        urls = tarballUrls "2.0.3";
        pgpsigUrls = map (n: "${n}.sig") src.urls;
        pgpKeyFingerprint = "1CB2 7DBC 9861 4B2D 5841  646D 0830 2DB6 A267 0428";
        inherit (src) outputHashAlgo;
        outputHash = "b52fd3bc9693de16db93aa23a11a56f3cdb3fbf005a360145401ab5d252490f5";
      };
    };
  
  
negative.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "644b6b03b285fb0ace02d241d59483d98bc462729d8bb3608d5cad5532f3d2f0";
    };
  
    configureFlags = [
      "--disable-doc"
  