anchor.diff:    gcloud-golang = buildFromGitHub {
       version = 2;
       date = "2016-09-15";
  -    rev = "1c43d7b0fe498512e7b301de9ce39d0c4a046305";
  +    rev = "99eed3309ff7980d16154d2258600a5b38b129a9";
       owner = "GoogleCloudPlatform";
       repo = "gcloud-golang";
  -    sha256 = "16y3swg61npy2sfdhdn35xv18gxscydw74mv7j9y32cbacqk9n9v";
  +    sha256 = "0rcg065in37hrc55qxa699855alz3g35xmgxd06m6nxaxjlmi3l8";
       goPackagePath = "cloud.google.com/go";
       goPackageAliases = [
         "google.golang.org/cloud"
  
positive.code:   raft_v1 = buildFromGitHub {
      version = 2;
      date = "2016-08-23";
      # Use the library-v2-stage-one branch until it is merged
      # into master.
      rev = "5f09c4ffdbcd2a53768e78c47717415de12b6728";
      owner  = "hashicorp";
      repo   = "raft";
  
negative.code:     meta.autoUpdate = false;
    };
  
    raft-boltdb_v2 = buildFromGitHub {
      version = 2;
      date = "2016-09-13";
      rev = "a8adffd05b79e3d8b1817d46bbe387a112265b3e";
      owner  = "hashicorp";
      repo   = "raft-boltdb";
      sha256 = "0kj22b0xk7avzwymkdi98f9vbbgslfd187njd7128nhgmdvfdn0m";
      propagatedBuildInputs = [
        bolt
        ugorji_go
        raft_v2
      ];
    };
  
    raft-boltdb_v1 = buildFromGitHub {
      inherit (raft-boltdb_v2) version rev date owner repo sha256;
      propagatedBuildInputs = [
        bolt
        ugorji_go
        raft_v1
      ];
    };
  
    ratecounter = buildFromGitHub {
  