anchor.diff:    };
   
     vultr = buildFromGitHub {
  -    version = 1;
  -    rev = "v1.9";
  +    version = 2;
  +    rev = "v1.10";
       owner  = "JamesClonk";
       repo   = "vultr";
  -    sha256 = "1nrvs4vh42l47hn0rwj56wsjby25072g46r7sra8ci16jnpcsqrq";
  +    sha256 = "189dx9djv80lcybyfwxm7lxyicgvxrz197f8j92yzqy0c8kfswi3";
       propagatedBuildInputs = [
         mow-cli
         tokenbucket
  
positive.code: 
    goleveldb = buildFromGitHub {
      version = 2;
      rev = "bc7a33199fc2a9e9051b71001a441f10983ffac6";
      date = "2016-10-10";
      owner = "syndtr";
      repo = "goleveldb";
      sha256 = "1kwdyzqkaza85fpn3ndca9axnsprydsy5j0vlybspd4rs620hmbz";
      propagatedBuildInputs = [ ginkgo gomega snappy ];
    };
  
  
negative.code: 
    grpc = buildFromGitHub {
      version = 2;
      rev = "b0578483843681a8905bc4d77c593c5ce0741210";
      owner = "grpc";
      repo = "grpc-go";
      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 = "2016-10-14";
    };
  
    grpc-gateway = buildFromGitHub {
  