anchor.diff:  
     crypto = buildFromGitHub {
       version = 2;
  -    rev = "2f8be38b9a7533b8763d48273737ff6e90428a96";
  -    date = "2017-01-10";
  +    rev = "abc5fa7ad02123a41f02bf1391c9760f7586e608";
  +    date = "2017-01-15";
       owner    = "golang";
       repo     = "crypto";
  -    sha256 = "0vqwmj5gh43qrxsn0df6423yjng9a6x8rmy8aapvi9gl0bmxy46c";
  +    sha256 = "0c832vh1wgxjd9j9f1gqy0hya67sb3dcx3nn6p3ny42snq16pz0r";
       goPackagePath = "golang.org/x/crypto";
       goPackageAliases = [
         "code.google.com/p/go.crypto"
  
positive.code: 
    gocql = buildFromGitHub {
      version = 2;
      rev = "5d087d1f0cd04ad126a3b2642b041d8f4a750677";
      owner  = "gocql";
      repo   = "gocql";
      sha256 = "1wbwsq2ig4hjr4fjs3kmbkq7pndrxp3qspxzj6qsi9gfi49v564n";
      propagatedBuildInputs = [
        inf_v0
        snappy
        hailocab_go-hostpool
        net
      ];
      date = "2016-12-29";
    };
  
    gojsonpointer = buildFromGitHub {
  
negative.code:     version = 2;
      owner = "minio";
      repo = "miniobrowser";
      date = "2017-01-14";
      rev = "b06d3f5371ad64b30b1a7f201d3a4a6cfdb8fe49";
      sha256 = "1bvg31aq2k6b9vikbsnhfx7slq0ls4jx4nbk6va2vyqw377pcvvl";
      propagatedBuildInputs = [
        go-bindata-assetfs
      ];
  