anchor.diff:  
     docker = buildFromGitHub {
       version = 2;
  -    rev = "ae99820357877c010ee76892fb64068f1212e7ae";
  +    rev = "7a97705b52e7f5c65d31870579cb1dcc09506d89";
       owner = "docker";
       repo = "docker";
  -    sha256 = "1f86d503jx1dqng5rmqghbi371w156mgnfbsd5b3q0svm6nc8y78";
  +    sha256 = "02b09zsq673y3rgcyb82jn507pvdslkyqy88fzsr6wrvjifwzhjw";
       meta.useUnstable = true;
       date = "2017-01-20";
     };
  
positive.code:     version = 2;
      owner = "coreos";
      repo = "etcd";
      rev = "v3.0.16";
      sha256 = "0sfgqp299mal3x5d38s7jhmia26kiafdanbv75k87nbwbs8r58k3";
      buildInputs = [
        bolt
        btree
  
negative.code: 
    ipfs = buildFromGitHub {
      version = 2;
      date = "2017-01-21";
      rev = "585a0d9f9d8de6df17a98ea4637eb64c005ef743";
      owner = "ipfs";
      repo = "go-ipfs";
      sha256 = "10h6wivlsz4lr8mxb7w900jkccri61gn5zgws5gy4xyhgm7afl87";
      gxSha256 = "1q5hpmsg28pvnp2c73jblxg4pwfvv3jfwi5z258xn8cx78rr1q6i";
      subPackages = [
        "cmd/ipfs"
        "cmd/ipfswatch"
  