anchor.diff:    };
   
     crypto = buildFromGitHub {
  -    rev      = "3760e016850398b85094c4c99e955b8c3dea5711";
  -    date     = "2015-01-13";
  +    rev = "1f22c0103821b9390939b6776727195525381532";
  +    date = "2016-01-26";
       owner    = "golang";
       repo     = "crypto";
  -    sha256   = "1zvm2rdfs8ljiswaddlhqbapdbk9v8wv12vpmg9dk9q3bmqx1af8";
  +    sha256 = "1acy12f396sr3lrnbcnym5q72qnlign5bagving41qijzjnc219m";
       goPackagePath = "golang.org/x/crypto";
       goPackageAliases = [
         "code.google.com/p/go.crypto"
  
positive.code:   };
  
    text = buildFromGitHub {
      rev = "6d3c22c4525a4da167968fa2479be5524d2e8bd0";
      date = "2016-01-25";
      owner = "golang";
      repo = "text";
      sha256 = "0bssiv428kdlw3xpr3fh7is3w68k8banmc80v1lzhvz16bmml3n2";
      goPackagePath = "golang.org/x/text";
      goPackageAliases = [ "github.com/golang/text" ];
    };
  
negative.code:   };
  
    image = buildFromGitHub {
      rev = "7c492694a6443a92fd349fda0c4c7b587040f161";
      date = "2016-01-02";
      owner = "golang";
      repo = "image";
      sha256 = "05c5qrph5r5ikzxw1mlgihx8396hawv38q2syjvwbxdiib9gfg9k";
      goPackagePath = "golang.org/x/image";
      goPackageAliases = [ "github.com/golang/image" ];
    };
  
    net = buildFromGitHub {
      rev = "6ccd6698c634f5d835c40c1c31848729e0cecda1";
      date = "2016-02-02";
      owner  = "golang";
      repo   = "net";
      sha256 = "10gnjjcgzn7z9l4hyqlammilxigln4m7jriv5apcsdk81ywbjrb5";
      goPackagePath = "golang.org/x/net";
      goPackageAliases = [
        "code.google.com/p/go.net"
  