anchor.diff:    };
   
     zappy = buildFromGitHub {
  -    version = 1;
  +    version = 3;
       date = "2016-07-23";
  -    rev = "2533cb5b45cc6c07421468ce262899ddc9d53fba";
  +    rev = "2533cb5b45cc6c07421468ce262899ddc9d53fb7";
       owner = "cznic";
       repo = "zappy";
  -    sha256 = "1fn4kqiggz6b5srkqhn37nwsi381x6hx3n83cbg0fxcb7zb3b6xl";
  +    sha256 = "1lvc4gi9h8xbgjq6x2bvxnq9pxh707zlgccpwmycpzx86gfvigmh";
       buildInputs = [
         mathutil
       ];
       extraSrcs = [
  -      {
  -        inherit (internal)
  -          goPackagePath
  -          src;
  -      }
  +      internal
       ];
     };
   }; in self
  
positive.code:   };
  
    internal = buildFromGitHub {
      version = 1;
      rev = "fbe290d56cdd8bb25347df893b14e3454f07bf7a";
      owner  = "cznic";
      repo   = "internal";
      sha256 = "0x80s83nq75xajyqspzcgj2mq5gxw9psxghvb676q8y96jn1n10k";
      date = "2016-07-19";
      buildInputs = [
        fileutil
        mathutil
  
negative.code:       sortutil
      ];
      extraSrcs = [
        internal
        zappy
      ];
      meta.useUnstable = true;
      date = "2016-11-02";
  