anchor.diff:  
     crypto = buildFromGitHub {
       version = 2;
  -    rev = "81372b2fc2f10bef2a7f338da115c315a56b2726";
  -    date = "2016-09-13";
  +    rev = "6ab629be5e31660579425a738ba8870beb5b7404";
  +    date = "2016-09-19";
       owner    = "golang";
       repo     = "crypto";
  -    sha256 = "0amy263gdk4nzhgfrsqbhikzjf7r44iyf903j6029qvl9mz68h4r";
  +    sha256 = "1fkf5fdny2d4zwrijxr7jv041hcs7rsqhmd9agmp11s9brvbx2x4";
       goPackagePath = "golang.org/x/crypto";
       goPackageAliases = [
         "code.google.com/p/go.crypto"
  
positive.code:     repo   = "go-ipfs-api";
      sha256 = "0c54r9g10rcnrm9rzj815gjkcgmr5z3pjgh3b4b19vbsgm2rx7hf";
      excludedPackages = "tests";
      propagatedBuildInputs = [ go-multiaddr-net go-multipart-files tar-utils ];
    };
  
    go-isatty = buildFromGitHub {
  
negative.code: 
    text = buildFromGitHub {
      version = 2;
      rev = "2df9074612f50810d82416d2229398a1e7188c5c";
      date = "2016-09-15";
      owner = "golang";
      repo = "text";
      sha256 = "0iw4ck14mhdll6l825nw1dp6jcbr2ccy3x3zpp2zkk433gx90iml";
      goPackagePath = "golang.org/x/text";
      goPackageAliases = [ "github.com/golang/text" ];
    };
  