anchor.diff:  
     prometheus_common = buildFromGitHub {
       version = 2;
  -    date = "2017-02-20";
  -    rev = "49fee292b27bfff7f354ee0f64e1bc4850462edf";
  +    date = "2017-04-18";
  +    rev = "9e0844febd9e2856f839c9cb974fbd676d1755a8";
       owner = "prometheus";
       repo = "common";
  -    sha256 = "03b452lj2cig2ar2ml6giqlqvjg4qbizmxzrdqclil9308d5d2c5";
  +    sha256 = "1nyrwbciin136836dz7g18wr6zzs63kwm39c56is6aapm4im3mik";
       buildInputs = [
         logrus
         net
  
positive.code:     version = 2;
      owner = "minio";
      repo = "minio-go";
      rev = "d423de54b2bc6d778f565e5b0ddf998a724de690";
      sha256 = "15n5m4rkxnbf591x65xdj6z45dwrnfh4nn7c2p65mcyfdlvpy36s";
      meta.useUnstable = true;
      date = "2017-04-13";
    };
  
    missinggo = buildFromGitHub {
  
negative.code: 
    go-couchbase = buildFromGitHub {
      version = 2;
      rev = "1711751adc03653d88867eecb98feca856197ced";
      owner  = "couchbase";
      repo   = "go-couchbase";
      sha256 = "0m3gc90fi14z7sylajkpf1vksiy54q510anwgk3yh0dc07haadjc";
      date = "2017-04-20";
      goPackageAliases = [
        "github.com/couchbaselabs/go-couchbase"
      ];
  