anchor.diff:  
     tools = buildFromGitHub {
       version = 2;
  -    rev = "fcfba28e23c7bbd8474b355ca7d6a9d88afcca00";
  -    date = "2017-01-17";
  +    rev = "721f218496963f33ebc9fbc5cdbdeed007ad9c49";
  +    date = "2017-01-22";
       owner = "golang";
       repo = "tools";
  -    sha256 = "1j638p3xdq44c4ymfakl6q2v7r0cg98d5wxdp2lnizi44r9l38bg";
  +    sha256 = "0icsjgiciwbwfhkh3akk6qqsrzym53mr8bihzcj9w4kf942n2nga";
       goPackagePath = "golang.org/x/tools";
       goPackageAliases = [ "code.google.com/p/go.tools" ];
   
  
positive.code:     version = 2;
      owner = "influxdata";
      repo = "influxdb";
      rev = "v1.1.1";
      sha256 = "0c5jcwgniqd2yai7pxmsx968i52r9144f8zg8hh3bcl1m81xg6mb";
      propagatedBuildInputs = [
        bolt
        gollectd
  
negative.code: 
    docker = buildFromGitHub {
      version = 2;
      rev = "f07f54951fcf918423463d57c67d6fe04b82941b";
      owner = "docker";
      repo = "docker";
      sha256 = "0dbhzw9ihgaysyh9a9dm7m0mxhz9waq3c7ysa6d1jb4gx13v7pzx";
      meta.useUnstable = true;
      date = "2017-01-24";
    };
  
    docker_for_runc = buildFromGitHub {
  