anchor.diff:            # Steven R. Loomis
             "4C95 9C0F 547B D2D8 B783  5B17 AAA9 AE9C 0F0D E47D"
           ];
  -        outputHash = "0eb46ba3746a9c2092c8ad347a29b1a1b4941144772d13a88667a7b11ea30309";
  +        outputHash = "2b0a4410153a9b20de0e20c7d8b66049a72aef244b53683d0d7521371683da0c";
           failEarly = true;
         };
     };
  
positive.code:     "http://download.icu-project.org/files/icu4c/${v}/icu4c"
    ];
  
    version = "58.1";
  in
  stdenv.mkDerivation rec {
    name = "icu4c-${version}";
  
negative.code:   passthru = {
      srcVerification =
        let
          version = "58.2";
        in
        fetchurl {
          inherit (src) outputHashAlgo;
  