osrm-backend/third_party/flatbuffers/tests/private_annotation_test.fbs

enum AB:byte (private) {
  A,
  B,
}

struct Object (private) {
    value: int;
}

union Any (private) { Game, Annotations }

table Game (private) {
    value: int;
}

table Annotations (private) {
    value: int;
}