anchor.diff:  
     structs = buildFromGitHub {
       version = 2;
  -    date = "2016-12-30";
  -    rev = "1de5ce037865f641d8eb22007e31cc5292a54e12";
  +    date = "2017-01-03";
  +    rev = "a720dfa8df582c51dee1b36feabb906bde1588bd";
       owner  = "fatih";
       repo   = "structs";
  -    sha256 = "1ki2gsv23sylbdcvi4rhgcr8cx3rg6wv84pzhj6rc6rh9kv78brg";
  +    sha256 = "11wryq1rk3b0ks5zy7fjsyml4clkipzwbzsywpjqlw39zfbcad0j";
     };
   
     stump = buildFromGitHub {
  
positive.code: 
    azure-sdk-for-go = buildFromGitHub {
      version = 2;
      date = "2016-12-15";
      rev = "1620af6b32398bfc91827ceae54a8cc1f55df04d";
      owner  = "Azure";
      repo   = "azure-sdk-for-go";
      sha256 = "0p7ckygm0hsrd9wg1a09hx6s2nhy8047szbz79gc3b7gldma8k97";
      excludedPackages = "Gododir";
      buildInputs = [
        decimal
  
negative.code: 
    crypto = buildFromGitHub {
      version = 2;
      rev = "c3b1d0d6d8690eaebe3064711b026770cc37efa3";
      date = "2017-01-07";
      owner    = "golang";
      repo     = "crypto";
      sha256 = "01cpr1m3v1n893nnsw0lx4r9dc00cs1nfwz68np73pq3lirc5nkg";
      goPackagePath = "golang.org/x/crypto";
      goPackageAliases = [
        "code.google.com/p/go.crypto"
  