tests/regression/issue_610/nanopb_generator_bug/first.proto

syntax="proto3";

import "nanopb_generator_bug/first/a.proto";
import "nanopb_generator_bug/first/b.proto";

message First {
    oneof oneof_first {
        first.A obj_a = 1;
        first.B obj_b = 2;
    }
}