anchor.diff:        ugorji_go
       ];
       meta.useUnstable = true;
  -    date = "2017-06-14";
  +    date = "2017-07-06";
     };
   
     session = buildFromGitHub {
  
positive.code:   grpc = buildFromGitHub {
      version = 3;
      date = "2017-07-05";
      rev = "0100e4262caf7c685f9fd42821a5e74bf213f0c9";
      owner = "grpc";
      repo = "grpc-go";
      sha256 = "142hl19vzmcbyrflmmxxlidp7fh0n9s2zpj907bwmp31717w57cy";
      goPackagePath = "google.golang.org/grpc";
      goPackageAliases = [
        "github.com/grpc/grpc-go"
  
negative.code: 
    prometheus_common = buildFromGitHub {
      version = 3;
      date = "2017-07-06";
      rev = "fb369f752a7f8b880c4a5199af7bfcb8aaaabaa4";
      owner = "prometheus";
      repo = "common";
      sha256 = "1j8g90pp74b9hj1sdayri8pa7p4k6652l050ph6fi95bhmfxyz00";
      buildInputs = [
        net
        prometheus_client_model
  