anchor.diff:  
     goleveldb = buildFromGitHub {
       version = 2;
  -    rev = "bc7a33199fc2a9e9051b71001a441f10983ffac6";
  -    date = "2016-10-10";
  +    rev = "6b4daa5362b502898ddf367c5c11deb9e7a5c727";
  +    date = "2016-10-11";
       owner = "syndtr";
       repo = "goleveldb";
  -    sha256 = "1kwdyzqkaza85fpn3ndca9axnsprydsy5j0vlybspd4rs620hmbz";
  +    sha256 = "0d54ykb9l45v4zn7k0aw8qayvnpazmdnrizqqkllyphahlppi8pz";
       propagatedBuildInputs = [ ginkgo gomega snappy ];
     };
   
  
positive.code: 
    gcloud-golang = buildFromGitHub {
      version = 2;
      date = "2016-10-10";
      rev = "8eb0f0f03ccb91217117fe064820a9e6a3585c3e";
      owner = "GoogleCloudPlatform";
      repo = "gcloud-golang";
      sha256 = "01xcbc5ylwqzz0c3xz83ilym5441r7plz4bix9x189vmcz14c821";
      goPackagePath = "cloud.google.com/go";
      goPackageAliases = [
        "google.golang.org/cloud"
  
negative.code: 
    net = buildFromGitHub {
      version = 2;
      rev = "8b4af36cd21a1f85a7484b49feb7c79363106d8e";
      date = "2016-10-13";
      owner  = "golang";
      repo   = "net";
      sha256 = "1jb29g54mjgpq1kj2a0v4jzz5hdf9wyhwjf2a9jk51q9fb5p6kh9";
      goPackagePath = "golang.org/x/net";
      goPackageAliases = [
        "code.google.com/p/go.net"
  