anchor.diff:  
     mongo-tools = buildFromGitHub {
       version = 2;
  -    rev = "r3.4.0";
  +    rev = "r3.4.1";
       owner  = "mongodb";
       repo   = "mongo-tools";
  -    sha256 = "0r5q4b0f8fqpfqq693377dpy6p25zcvc0k06a56wm1vra4la5ibz";
  +    sha256 = "0x74assi3rlr63sahiayfz4r7c9b1aq746ybhgn3pvgx9d70k5wa";
       buildInputs = [
         crypto
         escaper
  
positive.code: 
    go-dockerclient = buildFromGitHub {
      version = 2;
      date = "2017-01-05";
      rev = "fbeb72ccd29aa2596f364a5a85af622c651c3e16";
      owner = "fsouza";
      repo = "go-dockerclient";
      sha256 = "1iqlvg4rck3m8wiklh27sahgslvbbmfygq57hgzcs8763ynmldin";
      propagatedBuildInputs = [
        docker_for_go-dockerclient
        go-cleanhttp
  
negative.code: 
    go4 = buildFromGitHub {
      version = 2;
      date = "2017-01-01";
      rev = "0d03c2721aeea5277882f764f9ac7dd19fdfe4ac";
      owner = "camlistore";
      repo = "go4";
      sha256 = "023w3ax1vkvk6iqvk7567f64k8m5jnsp1c9di18fbv2zbjn6imw0";
      goPackagePath = "go4.org";
      goPackageAliases = [ "github.com/camlistore/go4" ];
      buildInputs = [
  