anchor.diff:  
     go-getter = buildFromGitHub {
       version = 2;
  -    rev = "21d247ece01f1f7d5b56f130fd7b1db19bb0d0db";
  -    date = "2017-01-09";
  +    rev = "8ff1c8c40df23480de72ae5f133e2a2be27b119a";
  +    date = "2017-01-21";
       owner = "hashicorp";
       repo = "go-getter";
  -    sha256 = "02s6miwibgrdamx74hyvqalvhms8ipw2yrlxpaki80awmw08lpj3";
  +    sha256 = "08m8dw2x12h7mbd2h74z59wkm9rv2jissvqxgzl2mcb8v9hy8kz8";
       propagatedBuildInputs = [
         aws-sdk-go
         go-homedir
  
positive.code: 
    go-shellwords = buildFromGitHub {
      version = 2;
      rev = "525bedee691b5a8df547cb5cf9f86b7fb1883e24";
      owner  = "mattn";
      repo   = "go-shellwords";
      sha256 = "0ch7f3128mac8ymfh15p2nrsis5472h9yr6dzwmmc6dbcslpvfk1";
      date = "2016-03-15";
    };
  
    go-simplejson = buildFromGitHub {
  
negative.code: 
    docker = buildFromGitHub {
      version = 2;
      rev = "7a97705b52e7f5c65d31870579cb1dcc09506d89";
      owner = "docker";
      repo = "docker";
      sha256 = "02b09zsq673y3rgcyb82jn507pvdslkyqy88fzsr6wrvjifwzhjw";
      meta.useUnstable = true;
      date = "2017-01-20";
    };
  