anchor.diff:  
     go-grpc-sql = buildFromGitHub {
       version = 6;
  -    rev = "72fa8515823be4fdc723721a5423ca6b98ec62c0";
  +    rev = "181d263025fb02a680c1726752eb27f3a2154e26";
       owner = "CanonicalLtd";
       repo = "go-grpc-sql";
  -    sha256 = "16wg2fa8p1yz1zs8l67c9g7nv0wiqnvwvsfy8yyhqhbxh220ma37";
  -    date = "2018-05-24";
  +    sha256 = "0al376z43y4aswx25794wn7i0yxsklalldys711799az4g01wl1j";
  +    date = "2018-07-11";
       propagatedBuildInputs = [
         errors
         CanonicalLtd_go-sqlite3
  
positive.code: 
    mgo_v2 = buildFromGitHub {
      version = 6;
      rev = "r2016.08.01";
      owner = "go-mgo";
      repo = "mgo";
      sha256 = "04mpjagap39x10pjxrxf4v90g7461qsx92llzqjnz1a1m1isba6v";
      goPackagePath = "gopkg.in/mgo.v2";
      excludedPackages = "dbtest";
      buildInputs = [
        pkgs.cyrus-sasl
      ];
    };
  
    minheap = buildFromGitHub {
  
negative.code:       yaml_v2
      ];
      meta.useUnstable = true;
      date = "2018-07-22";
    };
  
    cockroach = buildFromGitHub {
      version = 6;
      rev = "v2.0.4";
      owner  = "cockroachdb";
      repo   = "cockroach";
      sha256 = "177042l3a6ds91lxafh1l134gybmn5jwslyg10cxli0zg967kc2v";
      subPackages = [
        "pkg/build"
        "pkg/settings"
  