anchor.diff:  
     go-discover = buildFromGitHub {
       version = 3;
  -    rev = "25e4565347de14cea0a0e0730374c9fcffa7bab0";
  +    rev = "745a463b035b25a4d0c12d056e208e3850fdd1be";
       owner  = "hashicorp";
       repo   = "go-discover";
  -    sha256 = "1dj3x2xy9ffqgvr3icdr8jdg9pd307382i097wm4q8k7j8phypw9";
  -    date = "2017-09-25";
  +    sha256 = "09lignl425mqyssn2kr7zf7ibc7zk2rg6kv6k23ji7ymkrj1fmqn";
  +    date = "2017-10-04";
       propagatedBuildInputs = [
         aws-sdk-go
         #azure-sdk-for-go
  
positive.code: 
    go-lxc_v2 = buildFromGitHub {
      version = 3;
      rev = "89b06ca6fad6daea5a72a1f47e69e39716c46198";
      owner  = "lxc";
      repo   = "go-lxc";
      sha256 = "10jii0rgbslhz849ppaz4bv4b2gwblh5dda80aaibzpd4ayvhlvf";
      goPackagePath = "gopkg.in/lxc/go-lxc.v2";
      buildInputs = [
        pkgs.lxc
      ];
      date = "2017-09-19";
    };
  
    go-lz4 = buildFromGitHub {
  
negative.code: 
    build = buildFromGitHub {
      version = 3;
      rev = "11e039e9af9f076dbf28933cb4cd98bf8206d2a2";
      date = "2017-10-04";
      owner = "golang";
      repo = "build";
      sha256 = "1qkzl1m5bk46ycg56f2xz87w29cx054721b0frnl655q3mv5wlcc";
      goPackagePath = "golang.org/x/build";
      subPackages = [
        "autocertcache"
  