anchor.diff:      version = 3;
       owner = "garyburd";
       repo = "redigo";
  -    date = "2017-05-31";
  -    rev = "95d11dba2d44531bdb8022752b98912baafae03a";
  -    sha256 = "0i076qhnkpdwbananhbya5cg6d76xrn228y0dji2v81rmqv9x6f8";
  +    date = "2017-06-15";
  +    rev = "57f1cd7de6175c96b423e7ac2534ff2b39e2ef79";
  +    sha256 = "0mfdffg7d6n8kmx5hvip7jffyx962g2cbjp51casdf898hrj8jld";
       meta.useUnstable = true;
     };
   
  
positive.code: 
    docker_cli = buildFromGitHub {
      version = 3;
      date = "2017-06-14";
      rev = "4c224a778638da8664b963d95948f0de8149a988";
      owner = "docker";
      repo = "cli";
      sha256 = "1m4h6i37xw1r9fk93sd2bapy10s7xc9kfmlzwhcppbsvgb914527";
      subPackages = [
        "cli/config/configfile"
      ];
  
negative.code:     version = 3;
      owner = "spf13";
      repo = "hugo";
      rev = "v0.23";
      sha256 = "1sfy7fpbsp3z21qgx03898505s6g6klml2yl99hn292xfiknzj52";
      buildInputs = [
        ace
        afero
  