protobuf.dart#952 reproducer #2

anomaly1.proto

syntax = "proto3";

message Anomaly {
}

anomaly2.proto

syntax = "proto3";

import "element_a.proto";

message Anomaly {
  ElementA a = 1;
}

Dockerfile

FROM dart:3.7.0-sdk

RUN apt-get update
RUN apt-get install -y protobuf-compiler libprotobuf-dev

RUN dart pub global activate protoc_plugin

element_a.proto

syntax = "proto3";
message ElementA {}

element_b.proto

syntax = "proto3";
message ElementB {}

element_c.proto

syntax = "proto3";
message ElementC {}

has_bc.proto

syntax = "proto3";

import "element_b.proto";
import "element_c.proto";

message HasBC {
  ElementB b = 1;
  ElementC c = 2;
}

repro.sh

#!/bin/sh
set -eu

dart --version
dart pub global list
protoc --version
printf '\n'

rm -rf out1 out2
mkdir out1 out2

protoc -I/src --dart_out=out1 /src/anomaly1.proto /src/has_bc.proto
protoc -I/src --dart_out=out2 /src/anomaly2.proto /src/has_bc.proto

diff -u out1/has_bc.pb.dart out2/has_bc.pb.dart

run.sh

#!/bin/sh
set -eu
image=dart-protobuf-952
docker build -t "${image}" .
docker run --rm -v "$PWD:/src:ro" "${image}" /src/repro.sh