anchor.diff:  
     crypto = buildFromGitHub {
       version = 3;
  -    rev = "51714a8c4ac1764f07ab4127d7f739351ced4759";
  -    date = "2017-07-04";
  +    rev = "a48ac81e47fd6f9ed1258f3b60ae9e75f93cb7ed";
  +    date = "2017-07-06";
       owner    = "golang";
       repo     = "crypto";
  -    sha256 = "0b55cq03pvcchb5zgap96wz3d0pjca7jbi32f5psfljnbc00kh14";
  +    sha256 = "0pgzv9hlmayk3cnbnf6rzvsd6wrllmk89irbfrbx9969ilw27i7r";
       goPackagePath = "golang.org/x/crypto";
       buildInputs = [
         net_crypto_lib
  
positive.code: 
    serf = buildFromGitHub {
      version = 3;
      rev = "91fd53b1d3e624389ed9a295a3fa380e5c7b9dfc";
      owner  = "hashicorp";
      repo   = "serf";
      sha256 = "16ii1jkcphiihi1wwb9x62f56q9y9gwx3smpzrycx79ixsjl4xqf";
  
      buildInputs = [
        armon_go-metrics
  
negative.code: 
    text = buildFromGitHub {
      version = 3;
      rev = "cfdf022e86b4ecfb646e1efbd7db175dd623a8fa";
      date = "2017-07-06";
      owner = "golang";
      repo = "text";
      sha256 = "1135bjlqg3k85c1hnp6qvvmach7dbj0ymrqxyd016nvshpxva7as";
      goPackagePath = "golang.org/x/text";
      excludedPackages = "cmd";
    };
  