anchor.diff:  
     grpc = buildFromGitHub {
       version = 2;
  -    rev = "f8997e96d8fa0bf0fe52c16c6b479909385e3305";
  +    rev = "396f8ba2a6b9039070f4ff97561f5e408828fccd";
       owner = "grpc";
       repo = "grpc-go";
  -    sha256 = "0mr5s9s0whys0hh4jhynqhsn9n09v8wj1nrkg1hggq8bwsdw897h";
  +    sha256 = "1yc95bgn7nhif4s4pxvqi99hn4b5q9c5968400x4mwnbbmir0l7b";
       goPackagePath = "google.golang.org/grpc";
       goPackageAliases = [ "github.com/grpc/grpc-go" ];
       propagatedBuildInputs = [ http2 net protobuf oauth2 glog ];
       excludedPackages = "\\(test\\|benchmark\\)";
       meta.useUnstable = true;
  -    date = "2016-10-25";
  +    date = "2016-10-26";
     };
   
     grpc-gateway = buildFromGitHub {
  
positive.code: 
    ipfs = buildFromGitHub {
      version = 2;
      date = "2016-10-25";
      rev = "1c6e84ce7c9e8b6deb6a221e6379640de882d6fd";
      owner = "ipfs";
      repo = "go-ipfs";
      sha256 = "1fkdck4zs4dpzjyxgyxmv4mvml0gblran6nj9wyklkv1x4x0dh42";
      gxSha256 = "02i9mfxkc25kk4m1jhiy2h7hin1kdkzj2ny6braslynkwd9bv6xv";
      subPackages = [
        "cmd/ipfs"
        "cmd/ipfswatch"
  
negative.code:     version = 2;
      owner = "klauspost";
      repo = "reedsolomon";
      date = "2016-10-28";
      rev = "d0a56f72c0d40a6cdde43a1575ad9686a0098b70";
      sha256 = "0w78rwan71zmakaw2xb8zx9cxbi2658ghyhgmg2i9a175pxqg1ph";
      propagatedBuildInputs = [
        cpuid
      ];
  