anchor.diff:  
     gcloud-golang = buildFromGitHub {
       version = 2;
  -    date = "2016-09-30";
  -    rev = "90296fd601ebfc594192e722a022663b0c3f8756";
  +    date = "2016-09-17";
  +    rev = "fe3d41e1ecb2ce36ad3a979037c9b9a2b726226f";
       owner = "GoogleCloudPlatform";
       repo = "gcloud-golang";
  -    sha256 = "1vb2ld2dl0yd3f9bjgqj99rbi3y74lfl08c0xi4h1l29mn0i4gy2";
  +    sha256 = "0w83bl4y9gzv2jw43233ms1zv8gglzy546849l464wnsrkvfqj42";
       goPackagePath = "cloud.google.com/go";
       goPackageAliases = [
         "google.golang.org/cloud"
  
positive.code: 
    configure = buildFromGitHub {
      version = 2;
      rev = "b27f18d28c1023f11b99a1c8844f5d1215e494ae";
      owner = "gravitational";
      repo = "configure";
      sha256 = "10zk4nah622szz097pm05n9x5bp4vq9lgxy39mh1767mhziwnac9";
      date = "2016-09-09";
      propagatedBuildInputs = [
        gojsonschema
        kingpin_v2
  
negative.code: 
    net = buildFromGitHub {
      version = 2;
      rev = "0f2be02c5ddfa7c7936000ad519b04c6c795eab3";
      date = "2016-10-01";
      owner  = "golang";
      repo   = "net";
      sha256 = "06adf8srjzwzminiid6bfrjpi8y1qhrhb0z1m6r0m7v38wqwgmc8";
      goPackagePath = "golang.org/x/net";
      goPackageAliases = [
        "code.google.com/p/go.net"
  