anchor.diff:      version = 3;
       owner = "tidwall";
       repo = "gjson";
  -    date = "2017-05-26";
  -    rev = "c784c417818f59d6597274642d8ac1d09efc9b01";
  -    sha256 = "02w1yj6jz656a6b8czq6grjn24ayr3m4d00wm4wzsys6hwdpvjbi";
  +    date = "2017-08-15";
  +    rev = "4e8f0c7f2819fc0eceeae4d08df9dd92080b1b48";
  +    sha256 = "1khlpsraj40l8xr2ypxlhbn0f0z11x2hr932w1qvqa52493n8jjk";
       propagatedBuildInputs = [
         match
       ];
  
positive.code: 
    mitchellh_cli = buildFromGitHub {
      version = 3;
      date = "2017-08-03";
      rev = "8a539dbef410aa4191e0bcc7a6246c104b313009";
      owner = "mitchellh";
      repo = "cli";
      sha256 = "16l4d1ab6vq7vq11pyihzp3q0wrdq3mlh3hvmyg6xaz3j5xk284j";
      propagatedBuildInputs = [
        complete
        crypto
  
negative.code:       find . -name \*_classic.go -delete
        rm internal/main.go
      '';
      date = "2017-08-14";
    };
  
    arch = buildFromGitHub {
      version = 3;
      rev = "ffd22fb365cd6701b3b2c8f5240f32f302de4d14";
      date = "2017-08-18";
      owner = "golang";
      repo = "arch";
      sha256 = "0qfrywqxalnjnwk13na4n36yn16igxjzrd0bryq9rvj7z16926qb";
      goPackagePath = "golang.org/x/arch";
      excludedPackages = "spec";
    };
  
    build = buildFromGitHub {
      version = 3;
      rev = "8c6825293e8a53095b592dbe19dd2031d1af826a";
      date = "2017-08-18";
      owner = "golang";
      repo = "build";
      sha256 = "11zpc2inxh45f4zh0zpnvpbp7qramb65wdrrjvan3ybf5ymkcwvy";
      goPackagePath = "golang.org/x/build";
      subPackages = [
        "autocertcache"
  