[protobuf] oneof_index in FieldDescriptorInfo set to 0 for all fields

[mreu]

When I run this protobuf
message CommandMessage
{
    oneof Action
  {
    string set = 1;
    int32 inc = 2;
    int64 return = 3;
    bytes quit = 4;
  }

  optional string text = 20;
}
with protoc --descriptor_set_out, all fields have a 0 in oneof_index in the 
FieldDescriptorInfo. 

Is this the normal behaviour? If yes, how can I find out what fields are in 
the oneof?

Thanks
Michael

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