anchor.diff:    };
   
     luhn = buildFromGitHub {
  -    rev    = "0c8388ff95fa92d4094011e5a04fc99dea3d1632";
  -    date   = "2015-01-13";
  +    rev = "v1.0.0";
       owner  = "calmh";
       repo   = "luhn";
       sha256 = "1hfj1lx7wdpifn16zqrl4xml6cj5gxbn6hfz1f46g2a6bdf0gcvs";
  
positive.code:   };
  
    du = buildFromGitHub {
      rev    = "3c0690cca16228b97741327b1b6781397afbdb24";
      date   = "2015-08-05";
      owner  = "calmh";
      repo   = "du";
      sha256 = "1mv6mkbslfc8giv47kyl97ny0igb3l7jya5hc75sm54xi6g205wa";
  
negative.code:   };
  
    text = buildFromGitHub {
      rev = "db2353fc1b663d79d1001e206afc02a5ec9f4291";
      date = "2016-02-05";
      owner = "golang";
      repo = "text";
      sha256 = "0wn5ikx8fk84acwli9yqlwk2i55iy4bq78zws6n678rz0rana0ab";
      goPackagePath = "golang.org/x/text";
      goPackageAliases = [ "github.com/golang/text" ];
    };
  