anchor.diff:  
     go-github = buildFromGitHub {
       version = 2;
  -    date = "2016-10-28";
  -    rev = "f7fcf6f52ff94adf1cc0ded41e7768d2ad729972";
  +    date = "2016-11-04";
  +    rev = "55263f30529cb06f5b478efc333390b791cfe3b1";
       owner = "google";
       repo = "go-github";
  -    sha256 = "0qqfmzw8437r0xibsgg12i5hi9dw7f44zrlsbc9rr7mkfxbln2dz";
  +    sha256 = "1yhwizw2j1wwqbkgvx7cy6y46cb3v9pnaa0nhw1hglpr0w2bqymk";
       buildInputs = [ oauth2 ];
       propagatedBuildInputs = [ go-querystring ];
     };
  
positive.code: 
    go-systemd = buildFromGitHub {
      version = 2;
      rev = "61c7ee68bddeb1e66b491c3e1045c4f72b2cd6e3";
      owner = "coreos";
      repo = "go-systemd";
      sha256 = "04d2lynnd4k0i6w7fchaniibsh9mqnmhggf3kmqs4m4j8mljni17";
      propagatedBuildInputs = [
        dbus
        pkg
        pkgs.systemd_lib
      ];
      date = "2016-10-24";
    };
  
    go-systemd_journal = buildFromGitHub {
  
negative.code: 
    pq = buildFromGitHub {
      version = 2;
      rev = "d8eeeb8bae8896dd8e1b7e514ab0d396c4f12a1b";
      owner  = "lib";
      repo   = "pq";
      sha256 = "058sbzmm703pya1n7kh0qvj9p232n0qq62axl1fmzzrjj34qgyj7";
      date = "2016-11-02";
    };
  
    probing = buildFromGitHub {
  