anchor.diff:  
     net = buildFromGitHub {
       version = 3;
  -    rev = "513929065c19401a1c7b76ecd942f9f86a0c061b";
  -    date = "2017-05-17";
  +    rev = "5b58a9c3e1690d33a592e5b791638e25eb9b3f70";
  +    date = "2017-05-24";
       owner  = "golang";
       repo   = "net";
  -    sha256 = "18wpvclpm10v6m0764w061qrldizdb70p33fiwms7lqjdqmg25h9";
  +    sha256 = "1jmqvy8rr9z3ga14j4pwwgw3ji7hb70ywgf4r8kab3hmbm22n2ia";
       goPackagePath = "golang.org/x/net";
       goPackageAliases = [
         "github.com/hashicorp/go.net"
  
positive.code:       find . -name \*_classic.go -delete
        rm internal/main.go
      '';
      date = "2017-04-10";
    };
  
    crypto = buildFromGitHub {
      version = 3;
      rev = "0fe963104e9d1877082f8fb38f816fcd97eb1d10";
      date = "2017-05-16";
      owner    = "golang";
      repo     = "crypto";
      sha256 = "1wakjpcmrb3iy9k1h2zwch3jrsq14il94axyjk4hgrri9vwfk6if";
      goPackagePath = "golang.org/x/crypto";
      buildInputs = [
        net_crypto_lib
  
negative.code:   };
  
    handlers = buildFromGitHub {
      version = 3;
      owner = "gorilla";
      repo = "handlers";
      rev = "v1.2.1";
      sha256 = "1kndqmbzlp5xcapnmaqhwj6w3hxid6b4hb3z7vnai3jqh6fbd690";
    };
  
    hashstructure = buildFromGitHub {
  