anchor.diff:  }:
   
   let
  -  version = "2.2.4";
  +  version = "2.2.6";
   
     tarballUrls = version: [
       "mirror://gnu/guile/guile-${version}.tar.xz"
  
positive.code:   src = fetchurl {
      urls = tarballUrls version;
      hashOutput = false;
      sha256 = "d9e8b94af7b206fcf52bec6501b921bd7d0bd7a31fb7e896a35ba8253678e31e";
    };
  
    nativeBuildInputs = [
  
negative.code:   passthru = {
      srcVerification = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "2.2.6";
        inherit (src) outputHashAlgo;
        outputHash = "b33576331465a60b003573541bf3b1c205936a16c407bc69f8419a527bf5c988";
        fullOpts = {
          pgpsigUrls = map (n: "${n}.sig") urls;
          pgpKeyFingerprints = [
            "FF47 8FB2 64DE 32EC 2967  25A3 DDC0 F535 8812 F8F2"
            "3CE4 6455 8A84 FDC6 9DB4  0CFB 090B 1199 3D9A EBB5"
            "4FD4 D288 D445 934E 0A14  F9A5 A880 3732 E443 6885"
          ];
        };
      };
    };
  
  