anchor.diff:      sha256 = "0wgpmzh0ga2kh51r214jjhaqhpqr9l2k6p0xhy5a006qypk5fh2m";
     };
   
  -  mitchellh-cli = buildFromGitHub {
  +  mitchellh_cli = buildFromGitHub {
       date = "2016-03-23";
       rev = "168daae10d6ff81b8b1201b0a4c9607d7e9b82e3";
       owner = "mitchellh";
  
positive.code:     ];
    };
  
    raft = buildFromGitHub {
      date = "2016-06-03";
      rev = "4bcac2adb06930200744feb591fee8a0790f9c98";
  
negative.code:   };
  
    gomega = buildFromGitHub {
      rev = "3e93f011213c200aadafcb19ed56eb718381cfbd";
      owner  = "onsi";
      repo   = "gomega";
      sha256 = "1bcjl650zry7gpws55faca1wivn3grspvrixgam2w5fxs3la8lcf";
      propagatedBuildInputs = [
        protobuf
        yaml-v2
      ];
      date = "2016-06-13";
    };
  
    google-api-go-client = buildFromGitHub {
  