anchor.diff:  
     hcl = buildFromGitHub {
       version = 2;
  -    date = "2017-01-19";
  -    rev = "39fa3a62ba92cf550eb0f9cfb84757ef79b8aa30";
  +    date = "2017-01-24";
  +    rev = "db4f0768927a665a06c32855186e1bc762bcc8f5";
       owner  = "hashicorp";
       repo   = "hcl";
  -    sha256 = "1w0d702rxkr7grarckn79c75q04qp3c0z11fcs07j9n1id3jxblb";
  +    sha256 = "1yba2ig1wwy5bfinp2l6fyfg9pg6gzlv9a3b605cp15jl7dpimi1";
     };
   
     hdrhistogram = buildFromGitHub {
  
positive.code: 
    google-cloud-go = buildFromGitHub {
      version = 2;
      date = "2017-01-23";
      rev = "466326a043a32a9f269c8bfbb77a32667ede287f";
      owner = "GoogleCloudPlatform";
      repo = "google-cloud-go";
      sha256 = "0fw7y60v39raksbv39shzjqg787i1jxrdx1zm5xnzkgdzlqr5mq5";
      goPackagePath = "cloud.google.com/go";
      goPackageAliases = [
        "google.golang.org/cloud"
  
negative.code:     version = 2;
      owner = "spf13";
      repo = "pflag";
      rev = "a9a634f3de0a7529baded7ad6b0c7467d5c6eca7";
      date = "2017-01-25";
      sha256 = "0g3jkg3d2k7pxkgrqppha4bj1pv79kknhqbiqbh43ilzhzhp87cj";
    };
  
    pkcs7 = buildFromGitHub {
  