anchor.diff:  
     logrus = buildFromGitHub {
       version = 6;
  -    rev = "4ea4861398d99a2d05be29675c5b74caf7bea95e";
  +    rev = "cdb2f3857cfba7388d28dfe38316b0a39e694215";
       owner = "sirupsen";
       repo = "logrus";
  -    sha256 = "8dd76e5fbb77a136d080683fb76042be3dd21a976c0d5603887fcf3a94d2d32a";
  +    sha256 = "c9303e3939aa286a4632bd5bbcd6da29fed54792d68e478f951ee78a17ca3ae0";
       goPackageAliases = [
         "github.com/Sirupsen/logrus"
       ];
  
positive.code: 
    grpc = buildFromGitHub rec {
      version = 6;
      rev = "v1.10.1";
      owner = "grpc";
      repo = "grpc-go";
      sha256 = "65a812baf1d3eb6693d334e53d6cdec18779775763f92131187a3c8722bbbcce";
      goPackagePath = "google.golang.org/grpc";
      goPackageAliases = [
        "github.com/grpc/grpc-go"
  
negative.code: 
    gziphandler = buildFromGitHub {
      version = 6;
      rev = "v1.1.0";
      owner = "NYTimes";
      repo = "gziphandler";
      sha256 = "cd7c3974cf5a0dc2d591f70846a3f10310220b8ead47f8d8f33dc25e3c56b642";
    };
  
    hashland = buildFromGitHub {
  