Bug on codegen in ::prost::Enumeration

[0xAlcibiades]

error[E0119]: conflicting implementations of trait `TryFrom<i32>` for type `grpc_codegen::Action`
   --> /Users/bapperson/Code/MyProjects/valorem/trade-api/target/debug/build/mycodegen/out/mycodegen.v1.rs:341:68
    |
341 | #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord, ::prost::Enumeration)]
    |                                                                    ^^^^^^^^^^^^^^^^^^^^
    |
    = note: conflicting implementation in crate `core`:
            - impl<T, U> TryFrom<U> for T
              where U: Into<T>;
    = note: this error originates in the derive macro `::prost::Enumeration` (in Nightly builds, run with -Z macro-backtrace for more info)

Using tonic 0.10.1 and prost-types/prost 0.12.1, on building codegen for proto with an enumeration defined:

pub enum Action {
    Buy = 0,
    Sell = 1,
    Invalid = 255,
}

I see this bug, which prevents build from succeeding. This appears to be a regression in 0.9.2->0.10.1 tonic and 0.11.9 prost.

This was also noted in #812 in a recent comment.

[0xAlcibiades]

Bump on this @LucioFranco or another maintainer. Would be glad to pitch in here, it's preventing a major version update for anyone using enums.

[li3p]

May I kindly inquire about the latest developments regarding this issue and if there are any temporary solutions available at the moment?

[0xAlcibiades]

May I kindly inquire about the latest developments regarding this issue and if there are any temporary solutions available at the moment?

Using the previous minor version for now.

[0xAlcibiades]

@LucioFranco or other maintainer, any desire for a fix here?

[LucioFranco]

Hi @0xAlcibiades sorry about the delay. I don't have time right now to come up with a fix but I can review a PR if someone is interested in picking up that work.

[0xAlcibiades]

@LucioFranco Yeah, I think it'll involve reverting the changes, or fixing the changes from #853

[0xAlcibiades]

@LucioFranco @megsdevs put in PR #955 to resolve this issue.