This comma may exist elsewhere

[higherkinded]

https://github.com/edenhill/librdkafka/blob/b47da0e4eec900d9cb091d2f524e957505dbb513/src-cpp/rdkafkacpp.h#L3209

Trailing commas are totally valid in C++ enum declarations. This comma must exist between those members but it may be a trailing one after RK_MSG_BLOCK without any issues.

[edenhill]

If I remember correctly this was due to some old compiler complaining on trailing commas, perhaps an earler version of msvc.