anchor.diff:  
     oauth2 = buildFromGitHub {
       version = 2;
  -    rev = "96382aa079b72d8c014eb0c50f6c223d1e6a2de0";
  -    date = "2016-12-13";
  +    rev = "314dd2c0bf3ebd592ec0d20847d27e79d0dbe8dd";
  +    date = "2016-12-14";
       owner = "golang";
       repo = "oauth2";
  -    sha256 = "0654xmh4lrvsm71d51n15i3vhv5w6x5k4x6z8qgldm3wda7ipgdm";
  +    sha256 = "1r61rmfkqv17rh848pmy49xkzdjq8pmvvn9mxxxjq520vw3kk1rg";
       goPackagePath = "golang.org/x/oauth2";
       goPackageAliases = [ "github.com/golang/oauth2" ];
       propagatedBuildInputs = [
  
positive.code: 
    grpc = buildFromGitHub {
      version = 2;
      date = "2016-12-09";
      rev = "8712952b7d646dbbbc6fb73a782174f3115060f3";
      owner = "grpc";
      repo = "grpc-go";
      sha256 = "1v3jr36iy7kpcib9ss14xhfxrw34819zw52r4j9p0shv5siad9md";
      goPackagePath = "google.golang.org/grpc";
      goPackageAliases = [
        "github.com/grpc/grpc-go"
  
negative.code: 
    google-cloud-go = buildFromGitHub {
      version = 2;
      date = "2016-12-19";
      rev = "3c4c8cc11d151d76587802cb55dd7b80beca832b";
      owner = "GoogleCloudPlatform";
      repo = "google-cloud-go";
      sha256 = "1zsggnkg1vk1c2z6ljk2w5gsj8g212d249hlkf04kydyr044a5dq";
      goPackagePath = "cloud.google.com/go";
      goPackageAliases = [
        "google.golang.org/cloud"
  