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