anchor.diff:    };
   
     copystructure = buildFromGitHub {
  -    date = "2016-06-09";
  -    rev = "ae8f8315ad044b86ced2e0be9e3598e9dd94f38e";
  +    date = "2016-08-03";
  +    rev = "cdac8253d00f2ecf0a0b19fbff173a9a72de4f82";
       owner = "mitchellh";
       repo = "copystructure";
  -    sha256 = "185c10ab80cn4jxdp915h428lm0r9zf1cqrfsjs71im3w3ankvsn";
  +    sha256 = "1ax94in2m43cs0wd321rxjw0hdqqfizypihwv2mipp3x247rp8pq";
       propagatedBuildInputs = [ reflectwalk ];
     };
   
  
positive.code:   };
  
    golang-lru = buildFromGitHub {
      date = "2016-02-07";
      rev = "a0d98a5f288019575c6d1f4bb1573fef2d1fcdc4";
      owner  = "hashicorp";
      repo   = "golang-lru";
      sha256 = "1q4cvlrk1pzki8lkf8b5mc3ciini8b6dlljrijycdh7izfc17vsz";
    };
  
    golang-petname = buildFromGitHub {
  
negative.code:   };
  
    gcloud-golang = buildFromGitHub {
      date = "2016-08-18";
      rev = "e977e3911f5ba211c715d40c30fc81abfa9400ae";
      owner = "GoogleCloudPlatform";
      repo = "gcloud-golang";
      sha256 = "5aaf16cd8e8af6901a31133d925228309cbb2b006a8f59bb66728032be149571";
      goPackagePath = "cloud.google.com/go";
      goPackageAliases = [
        "google.golang.org/cloud"
  