Is it possible to use RESERVED in ENUMS? The proto3 language guide does not tell anything about this.
You can't use reserved in enums at the moment. The support was already added in our internal code base though. It missed the integration for 3.4.0 release but should be able to make its way into 3.5.0 release.
This has been released.
I think it would be best if it is explicitly documented in the guides that enum values can also be reserved.
(For both proto2 and proto3 guides.)
My bad. It has already been documented here:
https://developers.google.com/protocol-buffers/docs/proto3#enum_reserved
https://developers.google.com/protocol-buffers/docs/proto#enum_reserved
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You can't use reserved in enums at the moment. The support was already added in our internal code base though. It missed the integration for 3.4.0 release but should be able to make its way into 3.5.0 release.