anchor.diff:  
     crypto = buildFromGitHub {
       version = 2;
  -    rev = "119f50887f8fe324fe2386421c27a11af014b64e";
  -    date = "2016-05-18";
  +    rev = "81372b2fc2f10bef2a7f338da115c315a56b2726";
  +    date = "2016-09-13";
       owner    = "golang";
       repo     = "crypto";
  -    sha256 = "06ml0wq2rzvnl4wgpvkj3qkgsnjk8ywzd6ysmsihcf8vwlj90as2";
  +    sha256 = "0amy263gdk4nzhgfrsqbhikzjf7r44iyf903j6029qvl9mz68h4r";
       goPackagePath = "golang.org/x/crypto";
       goPackageAliases = [
         "code.google.com/p/go.crypto"
  
positive.code:   };
  
    blackfriday = buildFromGitHub {
      version = 1;
      owner = "russross";
      repo = "blackfriday";
      rev = "1d6b8e9301e720b08a8938b8c25c018285885438";
      sha256 = "1cc7mqmgj55k3sz79iff3b4s7vjgf5afjqrdlm218wyjsszihq8k";
      propagatedBuildInputs = [
        sanitized-anchor-name
      ];
      date = "2016-05-31";
    };
  
    blake2b-simd = buildFromGitHub {
  
negative.code:   };
  
    purell = buildFromGitHub {
      version = 2;
      owner = "PuerkitoBio";
      repo = "purell";
      rev = "v1.0.0";
      sha256 = "07kxcpb3pgk5n64445zvqb0z90nbm3i03dyz2d9j35ns0c00nnly";
      propagatedBuildInputs = [
        net
        text
        urlesc
      ];
    };
  