anchor.diff:  
     grpc = buildFromGitHub {
       version = 2;
  -    rev = "72d072e4c18c02bfe6c98fc661a4df74da546145";
  +    rev = "b0578483843681a8905bc4d77c593c5ce0741210";
       owner = "grpc";
       repo = "grpc-go";
  -    sha256 = "035crj0611nlssqj079qzh3qgfsd5r3bapkz8w6cgnn4f6x9dj1q";
  +    sha256 = "0vc4asaspmypmvcx2krxwid9dh7q8dcn2amqsdgnirl9rpw0v210";
       goPackagePath = "google.golang.org/grpc";
       goPackageAliases = [ "github.com/grpc/grpc-go" ];
       propagatedBuildInputs = [ http2 net protobuf oauth2 glog ];
       excludedPackages = "\\(test\\|benchmark\\)";
       meta.useUnstable = true;
  -    date = "2016-10-10";
  +    date = "2016-10-14";
     };
   
     grpc-gateway = buildFromGitHub {
  
positive.code: 
    protobuf = buildFromGitHub {
      version = 2;
      rev = "df1d3ca07d2d07bba352d5b73c4313b4e2a6203e";
      date = "2016-09-27";
      owner = "golang";
      repo = "protobuf";
      sha256 = "02afl1gbq0dzph61jljw1mvjv647ghcr69b5mgw978jjwf0cxx6a";
      goPackagePath = "github.com/golang/protobuf";
      goPackageAliases = [
        "code.google.com/p/goprotobuf"
  
negative.code: 
    mathutil = buildFromGitHub {
      version = 2;
      date = "2016-10-12";
      rev = "4609a45a9e61188d0d69a5d8ad42600c3df35002";
      owner = "cznic";
      repo = "mathutil";
      sha256 = "02kbxfgnbyvczrcig2cgjf3b1lnd0365cny94wrxfdrcfxblzn30";
      buildInputs = [ bigfft ];
    };
  
  