anchor.diff:    };
   
     ugorji_go = buildFromGitHub {
  -    version = 2;
  -    date = "2017-03-12";
  -    rev = "708a42d246822952f38190a8d8c4e6b16a0e600c";
  +    version = 3;
  +    date = "2017-06-20";
  +    rev = "5efa3251c7f7d05e5d9704a69a984ec9f1386a40";
       owner = "ugorji";
       repo = "go";
  -    sha256 = "0jx44bnpx3wy6ka3pidsfjp0n0ns1spcp7wy3ixvcfpixz3pfl46";
  +    sha256 = "17mjy6529wggl0a1rdkd1virvf9mihlwjx1djmwfyn96m7kzrn58";
       goPackageAliases = [
         "github.com/hashicorp/go-msgpack"
       ];
  
positive.code: 
    crypto = buildFromGitHub {
      version = 3;
      rev = "850760c427c516be930bc91280636328f1a62286";
      date = "2017-06-13";
      owner    = "golang";
      repo     = "crypto";
      sha256 = "0kdypzpwi2xpq3y1pqd9fm4fmc2yivpipswinxrawkzp0j9dllbl";
      goPackagePath = "golang.org/x/crypto";
      buildInputs = [
        net_crypto_lib
  
negative.code:     propagatedBuildInputs = [
        net
      ];
      date = "2017-06-18";
    };
  
    go-stun = buildFromGitHub {
      version = 3;
      rev = "0.1.0";
      owner  = "ccding";
      repo   = "go-stun";
      sha256 = "0rw7r4vmb4h7wm9r1wqymvx04jgsmdqrpf7sp523npdni4d1j1my";
    };
  
    go-syslog = buildFromGitHub {
  