> > Looking at the ffi_lib code now, it is clear that subsequent ffi_lib
> > calls are not good. Well, maybe we should make that totally explicit,
> > and just don't allow to call ffi_lib the second time?

>
> Probably best to have ffi_libraisean exception if the libs are already set. That solves it nicely and keeps users from tripping up on this.

I would also humbly suggest having second calls to Struct#layout also
raise, to avoid confusion [I assume they're not really expected].
-r