anchor.diff:    };
   
     logrus = buildFromGitHub {
  -    version = 1;
  -    rev = "v0.10.0";
  +    version = 2;
  +    rev = "380f64d344b252a007a59baa61f31820f59cba89";
       owner = "Sirupsen";
       repo = "logrus";
  -    sha256 = "1rf70m0r0x3rws8334rmhj8wik05qzxqch97c31qpfgcl96ibnfb";
  +    sha256 = "0md70j95frrm6ph72bdrn4gxl94m5zmz4pyp353rdaq3257qs2y9";
  +    date = "2016-10-31";
     };
   
     logutils = buildFromGitHub {
  
positive.code:     version = 2;
      owner = "tidwall";
      repo = "gjson";
      date = "2016-10-28";
      rev = "bc89b871decedbe529b11666631fb74eff19c8b8";
      sha256 = "0252p5rjgcmqkyn31c8ldd9pkvkfmdc0n86hb3ip71dfa7m5yi81";
      propagatedBuildInputs = [
        match
      ];
  
negative.code: 
    mitchellh_cli = buildFromGitHub {
      version = 2;
      date = "2016-10-29";
      rev = "fa17b36f6c61f1ddbbb08c9f6fde94b3c065a09d";
      owner = "mitchellh";
      repo = "cli";
      sha256 = "1xjh016f6qfjdw4m89i97l8hqkrfcblyx5miw6x12as4f7mkddzz";
      propagatedBuildInputs = [ crypto go-radix speakeasy go-isatty ];
    };
  
  