grpc/third_party/nanopb/tests/regression/issue_188/oneof.proto

syntax = "proto2";

message MessageOne
{
    required uint32 one = 1;
    required uint32 two = 2;
    required uint32 three = 3;
    required int32 four = 4;
}

enum EnumTwo
{
    SOME_ENUM_1 = 1;
    SOME_ENUM_2 = 5;
    SOME_ENUM_3 = 6;
    SOME_ENUM_4 = 9;
    SOME_ENUM_5 = 10;
    SOME_ENUM_6 = 12;
    SOME_ENUM_7 = 39;  
    SOME_ENUM_8 = 401;
}

message OneofMessage
{
    oneof payload {
        MessageOne message = 1;
        EnumTwo enum = 2;
    }
}