anchor.diff:  
     text = buildFromGitHub {
       version = 2;
  -    rev = "4ea6c073aae78d08c7e95e95aa7f55b888287d6f";
  -    date = "2016-11-22";
  +    rev = "5c6cf4f9a2357d38515014cea8c488ed22bdab90";
  +    date = "2016-11-30";
       owner = "golang";
       repo = "text";
  -    sha256 = "1x0zwdxic7kp268c12x06537301sj8r6ci5iqbwwx5d2i4wvwpdy";
  +    sha256 = "0lr9jrlyvip8mh2f9y38ifkgiys72bjl75df6ifinqd5jfy07bja";
       goPackagePath = "golang.org/x/text";
       goPackageAliases = [ "github.com/golang/text" ];
       excludedPackages = "cmd";
  
positive.code: 
    ipfs = buildFromGitHub {
      version = 2;
      date = "2016-11-29";
      rev = "f81cccc3fc927f592e6655fe280aa7f0c7d885c6";
      owner = "ipfs";
      repo = "go-ipfs";
      sha256 = "0s4qqrwcwk58hl26qkrabqcks2nchl4qm34ysyk32lpr1jaiwdzw";
      gxSha256 = "19slnx7l84p1in1xys3z6pplqm5n7mzsx7xv4sd15z6fh4xnd2l3";
      subPackages = [
        "cmd/ipfs"
        "cmd/ipfswatch"
  
negative.code: 
    crypto = buildFromGitHub {
      version = 2;
      rev = "21853a76e0cca35cf785c34dceee499a3d5a7168";
      date = "2016-11-30";
      owner    = "golang";
      repo     = "crypto";
      sha256 = "1i91g49bnds1lc0j3xynj3w93y4aszsk9sfzh9blgl5g9vgrzx8g";
      goPackagePath = "golang.org/x/crypto";
      goPackageAliases = [
        "code.google.com/p/go.crypto"
  