anchor.diff:    passthru = {
       srcVerification = fetchurl rec {
         failEarly = true;
  -      urls = tarballUrls "1.8.1";
  +      urls = tarballUrls "1.8.2";
         pgpsigUrls = map (n: "${n}.sig") urls;
         pgpKeyFingerprints = [
           # Werner Koch
  
positive.code:         # NIIBE Yutaka
          "031E C253 6E58 0D8E A286  A9F2 2071 B08A 33BD 3F06"
        ];
        outputHash = "7a2875f8b1ae0301732e878c0cca2c9664ff09ef71408f085c50e332656a78b3";
        inherit (src) outputHashAlgo;
      };
    };
  
negative.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "c8064cae7558144b13ef0eb87093412380efa16c4ee30ad12ecb54886a524c07";
    };
  
    buildInputs = [
  