anchor.diff:      version = 5;
       owner = "census-instrumentation";
       repo = "opencensus-go";
  -    rev = "7f68fb29b5923fc795ae8374e19599311f7645f2";
  -    sha256 = "1kwrjwnnwv5xrd0cky5g7pwqvj29d0j9x48jqsa2fzp70qyi25wa";
  +    rev = "ba5c8f18236dfa71ef27ee33c116d0996d1da1bc";
  +    sha256 = "0bgsj92bw3bmn5a0ckn0ljjwvngvwq7gn3lskxw55rdzzpq2jlcq";
       goPackagePath = "go.opencensus.io";
       subPackages = [
         "internal"
         "internal/tagencoding"
  -      "plugin/grpc"
  -      "plugin/grpc/grpcstats"
  -      "plugin/grpc/grpctrace"
  +      "plugin/ocgrpc"
  +      "plugin/ochttp"
  +      "plugin/ochttp/propagation/b3"
  +      "plugin/ochttp/propagation/google"
  +      "plugin/ochttp/propagation/tracecontext"
         "stats"
  +      "stats/internal"
  +      "stats/view"
         "tag"
         "trace"
         "trace/propagation"
  
positive.code:       grpc
        net
      ];
      meta.useUnstable = true;
      date = "2018-02-09";
    };
  
    open-golang = buildFromGitHub {
  
negative.code:   };
  
    cast = buildFromGitHub {
      version = 5;
      owner = "spf13";
      repo = "cast";
      rev = "v1.2.0";
      sha256 = "0kzhnlc6iz2kdnhzg0kna1smvnwxg0ygn3zi9mhrm4df9rr19320";
      buildInputs = [
        jwalterweatherman
      ];
  