55,58c55,61
< oneof inst_oneof {
< fixed32 inst = 2;
< bytes inst_bytes = 9;
< }
---
>
> // Either inst or inst_bytes must be used, but never both. That should be
> // enforced by the oneof keyword, but that's not supported in all versions
> // of protobuf syntax we need to work with for now.
> optional fixed32 inst = 2;
> optional bytes inst_bytes = 9;
>