anchor.diff:  
     vultr = buildFromGitHub {
       version = 2;
  -    rev = "v1.10";
  +    rev = "v1.11";
       owner  = "JamesClonk";
       repo   = "vultr";
  -    sha256 = "189dx9djv80lcybyfwxm7lxyicgvxrz197f8j92yzqy0c8kfswi3";
  +    sha256 = "0c854vmw0fxmzvjw1p3gc4l51crg2p0y5ky3b8fv5fpvy1am80q7";
       propagatedBuildInputs = [
         mow-cli
         tokenbucket
  
positive.code: 
    grpc = buildFromGitHub {
      version = 2;
      rev = "eca2ad68af4d7bf894ada6bd263133f069a441d5";
      owner = "grpc";
      repo = "grpc-go";
      sha256 = "01pzjiipxb7vxgvk6bmkh9cxcxnc2grp414q62ynazajb55air0d";
      goPackagePath = "google.golang.org/grpc";
      goPackageAliases = [ "github.com/grpc/grpc-go" ];
      propagatedBuildInputs = [ http2 net protobuf oauth2 glog ];
      excludedPackages = "\\(test\\|benchmark\\)";
      meta.useUnstable = true;
      date = "2016-11-23";
    };
  
    grpc-gateway = buildFromGitHub {
  
negative.code: 
    gocql = buildFromGitHub {
      version = 2;
      rev = "db6f35eb602dd0770a7162e0e23e5cfb1cc05b91";
      owner  = "gocql";
      repo   = "gocql";
      sha256 = "0jw7a78pksz91jx6cxvdjp3g3zsqbqvafz4wcvlk8hc3hfnr3xhb";
      propagatedBuildInputs = [
        inf_v0
        snappy
        hailocab_go-hostpool
        net
      ];
      date = "2016-11-29";
    };
  
    gojsonpointer = buildFromGitHub {
  