anchor.diff:  
     docker = buildFromGitHub {
       version = 2;
  -    rev = "833f1f44245c9e9514b931b19831ee58594f6b10";
  +    rev = "2c6bcf3ee7a72d0bfab58161f1db13ae220a820e";
       owner = "docker";
       repo = "docker";
  -    sha256 = "1f95cjvs660bpnad6v5ncbq6lyxvmc3k4m9drm3msyx3xf35bgc5";
  +    sha256 = "0j656ykmjjybnasbbs2y06939sc7hmcmj9mppimhbg6kj58w2nqh";
       meta.useUnstable = true;
  -    date = "2017-04-05";
  +    date = "2017-04-10";
       propagatedBuildInputs = [
         distribution_for_docker
         errors
  
positive.code:     version = 2;
      owner = "cheggaaa";
      repo = "pb";
      rev = "v1.0.11";
      sha256 = "0rb3m0d13l0dsgz8hwy0v2f46559mdrw5c09mpzpz1kkb92il9xi";
      goPackagePath = "gopkg.in/cheggaaa/pb.v1";
      propagatedBuildInputs = [
        go-runewidth
  
negative.code:     version = 2;
      owner = "coreos";
      repo = "etcd";
      rev = "a1a72202ff76a6b9246ca23dc8d2c0ee75d73d60";
      sha256 = "00yay9fv1jq8nj9wj91b5s6i249wv9wrs6j2ls7lkxlnx239bvws";
      buildInputs = [
        bolt
        btree
  