anchor.diff:      version = 3;
       owner = "moby";
       repo = "moby";
  -    rev = "4219156a6254bdc7d270f06742037df8e2708a9a";
  -    date = "2017-04-29";
  -    sha256 = "00c57zfpyfk6fvp68kww1mbh1b0qg1rqj0sc6xkk335xm63p6ba3";
  +    rev = "fa54c94b9d70c0582012aaef18991e1fb4dd59ba";
  +    date = "2017-05-02";
  +    sha256 = "0lg90s0vnym4cihr9jff1zcq2frdz9qra5mjlirll0j4vfy4f508";
       meta.useUnstable = true;
     };
   
  
positive.code: 
    grpc = buildFromGitHub {
      version = 3;
      date = "2017-04-28";
      rev = "0eb507a2ca07f13baf499f89d66cc566bf644643";
      owner = "grpc";
      repo = "grpc-go";
      sha256 = "0hg247r2djag0q8wh6x4xxxp83x339zrz7brms7agl8sy97q4l5f";
      goPackagePath = "google.golang.org/grpc";
      goPackageAliases = [
        "github.com/grpc/grpc-go"
  
negative.code:     version = 3;
      owner = "spf13";
      repo = "pflag";
      rev = "c990990ab4981d84da820b7b00c85139ca150b5f";
      date = "2017-05-02";
      sha256 = "093c90hph0id7byxj8dxmas4m85nfk5rkp9044jmb5lnlic79cbi";
    };
  
    pkcs7 = buildFromGitHub {
  