anchor.diff:  
     net = buildFromGitHub {
       version = 2;
  -    rev = "cd95c68ba21fc7ee16ee38cc420473e3d8c4afd8";
  +    rev = "0f2be02c5ddfa7c7936000ad519b04c6c795eab3";
       date = "2016-10-01";
       owner  = "golang";
       repo   = "net";
  -    sha256 = "1a9vjy14mdzz9iy47jriq3q38vb3qd3nvzfmvh7yl5ssyi2yhayq";
  +    sha256 = "06adf8srjzwzminiid6bfrjpi8y1qhrhb0z1m6r0m7v38wqwgmc8";
       goPackagePath = "golang.org/x/net";
       goPackageAliases = [
         "code.google.com/p/go.net"
  
positive.code: 
    configure = buildFromGitHub {
      version = 2;
      rev = "b27f18d28c1023f11b99a1c8844f5d1215e494ae";
      owner = "gravitational";
      repo = "configure";
      sha256 = "10zk4nah622szz097pm05n9x5bp4vq9lgxy39mh1767mhziwnac9";
      date = "2016-09-09";
      propagatedBuildInputs = [
        gojsonschema
        kingpin_v2
  
negative.code: 
    crypto = buildFromGitHub {
      version = 2;
      rev = "484eb34681af59703e639b971bc307019182c41f";
      date = "2015-11-08";
      owner    = "golang";
      repo     = "crypto";
      sha256 = "10lr2p1p8ln9v89qqz8s2qfyzfl8yxvlasmyxhfirvd3mw0fspch";
      goPackagePath = "golang.org/x/crypto";
      goPackageAliases = [
        "code.google.com/p/go.crypto"
  