anchor.diff:  
     google-cloud-go = buildFromGitHub {
       version = 3;
  -    date = "2017-06-23";
  -    rev = "9d0d2cf2897dfcd18a86e1666038caf1c38e77f8";
  +    date = "2017-06-26";
  +    rev = "2cbf161fc57d9dda2921f3d7841e0b683fa09d3e";
       owner = "GoogleCloudPlatform";
       repo = "google-cloud-go";
  -    sha256 = "1d1mbrw953sw6gf1mnwhip8hp9pnbw3grjwb4v5134kx56zgcm9g";
  +    sha256 = "0g827xqvbkxyfzc6pb2dc5cdmsskp55smlw42m5js9rvvsp93z0z";
       goPackagePath = "cloud.google.com/go";
       goPackageAliases = [
         "google.golang.org/cloud"
  
positive.code:     version = 3;
      owner = "pelletier";
      repo = "go-toml";
      rev = "fe7536c3dee2596cdd23ee9976a17c22bdaae286";
      sha256 = "0axf1caymwvjx8kw9z1j749gs1sgc7lz06dggxskvms4f4bvg4qn";
      propagatedBuildInputs = [
        go-buffruneio
      ];
      meta.useUnstable = true;
      date = "2017-06-02";
    };
  
    go-units = buildFromGitHub {
  
negative.code:     version = 3;
      owner = "spf13";
      repo = "cobra";
      rev = "4d647c8944eb42504a714e57e97f244ed6344722";
      date = "2017-06-24";
      sha256 = "0sj9d75hhaq42gg04w7v55h1jlgfmngj4g98kwpfq58nx8qv794j";
      buildInputs = [
        go-homedir
        mousetrap
  