Yuya Nishihara 2382ae09e2 gen-protos: make old protoc accept optional fields ...

The version installed by ubuntu "latest" doesn't seem to support optional
fields yet. This is copied from the prost documentation.

https://docs.rs/prost-build/latest/prost_build/struct.Config.html#method.protoc_arg

2023-07-27 15:32:48 +09:00

..

main.rs

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