anchor.diff:  
     ugorji_go = buildFromGitHub {
       version = 3;
  -    date = "2017-11-21";
  -    rev = "b051152d28096a3a49ab8c09fc773863befb1728";
  +    date = "2017-11-22";
  +    rev = "84cb69a8af8316eed8cf4a3c9368a56977850062";
       owner = "ugorji";
       repo = "go";
  -    sha256 = "0amwjm1i523r59civwhnrpjdwj6a0mnggs9rlczsihdzjgl0f7z9";
  +    sha256 = "1z8zrmfp5kfic8lj9rv0939nrh5smkj6ywh2nx6fgx8r5441qf0a";
       goPackageAliases = [
         "github.com/hashicorp/go-msgpack"
       ];
  
positive.code: 
    google-cloud-go = buildFromGitHub {
      version = 3;
      date = "2017-11-21";
      rev = "d30a909c68aade42fadac37751a1ba349dac77e4";
      owner = "GoogleCloudPlatform";
      repo = "google-cloud-go";
      sha256 = "0zxszfxmxbf6931ic97r3ipk0swmiwpi908gakv3js9ygw5dgkll";
      goPackagePath = "cloud.google.com/go";
      goPackageAliases = [
        "google.golang.org/cloud"
  
negative.code:   };
  
    docopt-go = buildFromGitHub {
      version = 3;
      rev = "0.6.2";
      owner  = "docopt";
      repo   = "docopt-go";
      sha256 = "1cxn2aimmkibzcph3m3zidq4mbllxkdsbr28zrvqb2krw9zdqhn9";
    };
  
    dropbox-sdk-go-unofficial = buildFromGitHub {
  