anchor.diff:  
     google-cloud-go = buildFromGitHub {
       version = 2;
  -    date = "2017-02-15";
  -    rev = "a36575d2d41a1a6fbd1de1bb4509ef4c7dbef985";
  +    date = "2017-02-16";
  +    rev = "0b87d14d90086b53a97dfbd66f3000f7f112b494";
       owner = "GoogleCloudPlatform";
       repo = "google-cloud-go";
  -    sha256 = "1ng49a9glka4j70dlfsb1cqv6mz83kv2s24syfms3awyk7k33hyy";
  +    sha256 = "145fsk3v68faaf514v3yqz3lwgip1a3whwy637pds0i1w16dwdvk";
       goPackagePath = "cloud.google.com/go";
       goPackageAliases = [
         "google.golang.org/cloud"
  
positive.code:       testify
      ];
      meta.useUnstable = true;
      date = "2017-02-09";
    };
  
    cupcake_rdb = buildFromGitHub {
  
negative.code:     version = 2;
      owner = "ncw";
      repo = "rclone";
      rev = "dac4bb22d39b83300614b1dedf7cdfffe07dfe53";
      sha256 = "1x6w3krpiv43xnyjja6bns351hdhr84wg1p3vylgcj1mikaanmpl";
      propagatedBuildInputs = [
        aws-sdk-go
        cobra
  