system/host/fidl/examples/interface-ordinals.fidl2

module interface_ordinals

interface Foo {
    1: SomeMethod();
    2: SomeMethodWithAResponse() -> ();
    3: event SomeEvent(status response);
}

interface Bar {
    4: DoIt();
}

interface FooAndBarWaitTheresMore : Foo, Bar {
    5: MoreMoreMore();
}