Enum FunctionOrigin

This enum describes the origin of a function.

The origin of a function value can either be:

1. The host.
2. The caller pack.
3. Packs other than the caller pack. In this case, the origin is represented by a handle to the pack that the function belongs to.

enum FunctionOrigin {
    Host,
    Caller,
    Other(hndl("pack"))
}