anchor.diff:  
     docker = buildFromGitHub {
       version = 2;
  -    rev = "4436a5946d1cc20efb3af5a3d0c56894c02f1a29";
  +    rev = "5add856be6411f776556f85b9e3ef17049de043e";
       owner = "docker";
       repo = "docker";
  -    sha256 = "1fnqz5h0gjkp4bppja78a56i3jr7w0vfmd0s12z4r6k76df2i17f";
  +    sha256 = "1rd4dp6lwjiwbsbpqbg8fiaswdhag752h3v08manxhzivnh5kxx2";
       meta.useUnstable = true;
  -    date = "2016-12-18";
  +    date = "2016-12-19";
     };
   
     docker_for_runc = buildFromGitHub {
  
positive.code: 
    roaring = buildFromGitHub {
      version = 2;
      rev = "v0.3.0";
      owner  = "RoaringBitmap";
      repo   = "roaring";
      sha256 = "0hjzbwaqm0vqv8fi9am1spkilfaqgzvhiasdjpmz4nhi95if0jzs";
      propagatedBuildInputs = [
        go-unsnap-stream
        msgp
  
negative.code: 
    crypto = buildFromGitHub {
      version = 2;
      rev = "2b786ab9e9649dc660afa3bd580fd05a05e20d95";
      date = "2016-12-19";
      owner    = "golang";
      repo     = "crypto";
      sha256 = "17aqinhp9g0515jvxxpm29villnvp0fxmlzdfvhg41rjivp864h9";
      goPackagePath = "golang.org/x/crypto";
      goPackageAliases = [
        "code.google.com/p/go.crypto"
  