anchor.diff:  
     syncthing = buildFromGitHub rec {
       version = "0.12.16";
  -    rev = "v0.12.17";
  +    rev = "v0.12.18";
       owner = "syncthing";
       repo = "syncthing";
  -    sha256 = "1sd2hdvkc21nkff65n41chrhqbsfy0hl2llzlpvh951m664kh3qv";
  +    sha256 = "00a6m4w41f5md8459sqrl81zkcxbl7m5np6k2lxnydkq3lw0bibv";
       buildFlags = [ "-tags noupgrade,release" ];
       buildInputs = [
         go-lz4 du luhn xdr snappy ratelimit osext
  
positive.code:   };
  
    groupcache = buildFromGitHub {
      date = "2016-01-27";
      rev = "d995f8a6686adff0b1f2f20c52ef4114981d2006";
      owner  = "golang";
      repo   = "groupcache";
      sha256 = "11qqsm196v19wlaq39cchcvsf8vrdzd43rfsp39qpf253slc6jl1";
      buildInputs = [ protobuf ];
    };
  
    grpc = buildFromGitHub {
      rev = "66b94b9f6b45652d6824be23517979d31f27cd15";
      date = "2016-02-03";
      owner = "grpc";
      repo = "grpc-go";
      sha256 = "093sh1ic6qj8mn8nd91rk5h5gs2qkr5dk9ix09428niqxgm5fy0s";
      goPackagePath = "google.golang.org/grpc";
      goPackageAliases = [ "github.com/grpc/grpc-go" ];
      propagatedBuildInputs = [ http2 net protobuf oauth2 glog ];
  
negative.code:   };
  
    text = buildFromGitHub {
      rev = "2ea5e055772cf5daa0b1478d6e88c8d0c3d4cb79";
      date = "2016-02-04";
      owner = "golang";
      repo = "text";
      sha256 = "1ppmldy9mww78lg9h1sb1lbzw3bphbin6vh2xns6243pda00xhl7";
      goPackagePath = "golang.org/x/text";
      goPackageAliases = [ "github.com/golang/text" ];
    };
  