anchor.diff:  
     hil = buildFromGitHub {
       version = 2;
  -    date = "2016-12-09";
  -    rev = "543808c44b249df579868afe2cc0692a02bf0478";
  +    date = "2016-12-21";
  +    rev = "5b8d13c8c5c2753e109fab25392a1dbfa2db93d2";
       owner  = "hashicorp";
       repo   = "hil";
  -    sha256 = "1rzgyhv9gkb3g41c35rh9xmi4p5db3j92ln3qs58i6rrdk07cbd3";
  +    sha256 = "1gc7kw6bp3kaixqbaiga92ywhqs1mrdablp9297kgvbgnhdz44gn";
       propagatedBuildInputs = [
         mapstructure
         reflectwalk
  
positive.code:     version = 2;
      owner = "minio";
      repo = "dsync";
      date = "2016-11-29";
      rev = "f5c8966dc0a1a721d910f5553f3ec76cc4820a20";
      sha256 = "1i805s6fhf38l91hrl29fxvy2rykww87kv2f19rhz5zx8kplfrq2";
    };
  
    ed25519 = buildFromGitHub {
  
negative.code: 
    crypto = buildFromGitHub {
      version = 2;
      rev = "f6b343c37ca80bfa8ea539da67a0b621f84fab1d";
      date = "2016-12-21";
      owner    = "golang";
      repo     = "crypto";
      sha256 = "1q8ry46xkq354szl5xf8568dvfznv21hkbbl7cigrdmmbrm82984";
      goPackagePath = "golang.org/x/crypto";
      goPackageAliases = [
        "code.google.com/p/go.crypto"
  