In generated rust code, i32 to enum type conversion using from_i32() is deprecated

[yeoupooh]

Report

If there is an enum type in protobuf message, there is a deprecated issue in converting i32 to the enum in generated rust code like below.

• message.proto

  enum MyEnum {
  A = 0;
  B = 1;
  }

• rust code

  let my_enum: MyEnum = MyEnum::from_i32(i32_enum).unwrap();

• compiler warning log:

  warning: use of deprecated associated function `messages::my_app::MyEnum::from_i32`: Use the TryFrom<i32> implementation instead

This could be fixed by upgrading the prost package to v0.12.6 which is the latest one. See the related fix on the prost.

Steps to Reproduce

N/A

System Information

N/A

[temeddix]

Great, there will be a new version soon with this fix applied :) Thanks for the report!