anchor.diff:      version = 6;
       owner = "erikdubbelboer";
       repo = "gspt";
  -    rev = "2cac68f23d57e3e28a73b70d8d5d904749ec46e8";
  -    sha256 = "1n7bhisr5y14xicwcb73bjc9r8gchsqcqknhhx93s7hfy9ps7mfw";
  -    date = "2017-11-14";
  +    rev = "08ed213262b5bb2cf6ccb0baa71c6b201d353e63";
  +    sha256 = "1lsv9314qma8fbdwyklbwz83a0lafwxi75f0lklcfhlh79z93gmz";
  +    date = "2018-05-01";
     };
   
     guid = buildFromGitHub {
  
positive.code:       yaml_v2
      ];
      meta.useUnstable = true;
      date = "2018-04-12";
    };
  
    cockroach = buildFromGitHub {
      version = 6;
      rev = "v2.0.0";
      owner  = "cockroachdb";
      repo   = "cockroach";
      sha256 = "1mkn40qs0xyk6n4zrrwllk2d0fgl9yg1ggibfca55xbm9sjshr85";
      subPackages = [
        "pkg/build"
        "pkg/settings"
  
negative.code:     ];
    };
  
    zap-logfmt = buildFromGitHub {
      version = 6;
      rev = "v1.0.0";
      owner  = "jsternberg";
      repo   = "zap-logfmt";
      sha256 = "1619ma694s85np6a3ckr9gq6cf3y3kmrqd1m3cwfwf2r4a3ylbc5";
      propagatedBuildInputs = [
        zap
      ];
    };
  
    zipkin-go-opentracing = buildFromGitHub {
      version = 6;
      rev = "v0.3.3";
  