anchor.diff:    };
   
     pat = buildFromGitHub {
  -    version = 2;
  +    version = 6;
       owner = "bmizerany";
       repo = "pat";
  -    date = "2016-02-17";
  -    rev = "c068ca2f0aacee5ac3681d68e4d0a003b7d1fd2c";
  -    sha256 = "aad2d84661ea918168e60ed7bab467d4e0fce28fe9372e786c2714c10f6490a7";
  +    date = "2017-08-15";
  +    rev = "6226ea591a40176dd3ff9cd8eff81ed6ca721a00";
  +    sha256 = "00ykc2zv61zlw3ai22cvldc85ljs92wijkcn7ijj5bb2hmx773p4";
     };
   
     pb = buildFromGitHub {
  
positive.code: 
    go-ipfs-cmdkit = buildFromGitHub {
      version = 6;
      rev = "9333ed4fc23d2bdc0a59a38572c8d3bfc1119189";
      owner  = "ipfs";
      repo   = "go-ipfs-cmdkit";
      sha256 = "0hpgdrirxkzqq379llvqr87rwjzdpd011w6vdkwr7w86xq1qpsck";
      date = "2018-04-15";
      propagatedBuildInputs = [
        sys
      ];
  
negative.code:     version = 6;
      owner = "minio";
      repo = "minio";
      rev = "d6df9b16ac537288eef5be2fc5ff22a43afd9400";
      sha256 = "1nh9q52xjfm3zq61qb4l9p52djaaf0i3wsncqhwcbr97g82kmi3g";
      propagatedBuildInputs = [
        aliyun-oss-go-sdk
        amqp
  