anchor.diff:  
     genproto = buildFromGitHub {
       version = 2;
  -    date = "2017-02-14";
  -    rev = "dee11a626cb8e7ff045ac9413dcd8a92e72f5863";
  +    date = "2017-03-03";
  +    rev = "1e95789587db7d93ebbaa5eb65da17d3dbf8ab64";
       owner  = "google";
       repo   = "go-genproto";
       goPackagePath = "google.golang.org/genproto";
  -    sha256 = "1zfbwqizh9asvq6qbhpbjpn2jsfx8kf04pc3g67qzb3ff0hilv05";
  +    sha256 = "1359q9ip6kfwc25fj43xb6blidgv3p4c805ddkqf7kfqxkzdd2ya";
       propagatedBuildInputs = [
         grpc
         net
  
positive.code: 
    circonus-gometrics = buildFromGitHub {
      version = 2;
      date = "2017-02-21";
      rev = "dbab9a33438e3f8317407ef5d3a51c29340541db";
      owner  = "circonus-labs";
      repo   = "circonus-gometrics";
      sha256 = "19gc4p5n47axnypxss70as03fbvb0mb06zii5xiq3s6sv5hf6lf7";
      propagatedBuildInputs = [
        circonusllhist
        go-retryablehttp
  
negative.code: 
    swift = buildFromGitHub {
      version = 2;
      rev = "b6350f23a6ed2cad7d3697d0a7e0534f6d15e66d";
      owner  = "ncw";
      repo   = "swift";
      sha256 = "1djga80j0hcz8db7wyjsxzilgah5lsv1dnm3k29lr2ac29g44w2l";
      date = "2017-03-03";
    };
  
    anacrolix_sync = buildFromGitHub {
  