anchor.diff:  
     pq = buildFromGitHub {
       version = 2;
  -    rev = "068cb1c8e4be77b9bdef4d0d91f162160537779e";
  +    rev = "ae8357db35d721c58dcdc911318b55bef6b1b001";
       owner  = "lib";
       repo   = "pq";
  -    sha256 = "1v43wfwfxmrivdcva9ar0f467aylxrj8agnnnpp7qchxp1yvidni";
  -    date = "2016-10-11";
  +    sha256 = "1ys9x2mcnpi39q3fi32jfwvh1pnzqzy90pgamcpkvm09arvyx00m";
  +    date = "2016-10-13";
     };
   
     probing = buildFromGitHub {
  
positive.code: 
    goleveldb = buildFromGitHub {
      version = 2;
      rev = "bc7a33199fc2a9e9051b71001a441f10983ffac6";
      date = "2016-10-10";
      owner = "syndtr";
      repo = "goleveldb";
      sha256 = "1kwdyzqkaza85fpn3ndca9axnsprydsy5j0vlybspd4rs620hmbz";
      propagatedBuildInputs = [ ginkgo gomega snappy ];
    };
  
  
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"
  