anchor.diff:  
     google-cloud-go = buildFromGitHub {
       version = 3;
  -    date = "2017-10-18";
  -    rev = "3b867f5ce55314b528ac4bae86b7954e61925809";
  +    date = "2017-10-21";
  +    rev = "fe0653d4774c1b8e92ef69c9808d9002a1e45d90";
       owner = "GoogleCloudPlatform";
       repo = "google-cloud-go";
  -    sha256 = "0lzpppfb4fg6d23bz449qckdrbyn8hh16zxgmhk9567in9jk2prq";
  +    sha256 = "0901haakzi12m9f0v0g276329wvqmjlncixdbpd3nmy3qla4vaks";
       goPackagePath = "cloud.google.com/go";
       goPackageAliases = [
         "google.golang.org/cloud"
  
positive.code: 
    cfssl = buildFromGitHub {
      version = 3;
      date = "2017-09-16";
      rev = "7d88da830aad9d533c2fb8532da23f6a75331b52";
      owner  = "cloudflare";
      repo   = "cfssl";
      sha256 = "0gxkciddwdl7vfcr0gr4m8hx0y6786zq0xkfa4ji179sb6spk0g0";
      subPackages = [
        "auth"
        "api"
  
negative.code:     version = 3;
      owner = "libp2p";
      repo = "go-libp2p-transport";
      date = "2017-10-20";
      rev = "273920491d909b5eb5c890d717b89e1860ec6184";
      sha256 = "1kn41xinlmibx6jaxr1152ns96l8nqzvyvnymnxfi0rgwg2yjdhd";
      propagatedBuildInputs = [
        go-log
        go-multiaddr
  