Re: buildable interface testers error

[Kevin Ryde <user42 zip com au>]

Torsten Schoenfeld <kaffeetisch gmx de> writes:
>   Gtk2::Widget->isa ('Gtk2::Buildable');

Ah yes.  I thought of

    Gtk2::Buildable->isa('Glib::Interface')

but that's not jigged up.  Glib::Interface appears in
Glib::Type->list_ancestors('Gtk2::Buildable'), but list_ancestors croaks
if the given type doesn't exist, which is no so friendly for a
conditional ...

> +                     croak ("encountered unregistered interface %s",
> +                            SvPV_nolen (*svp));

Sounds good.  Or maybe just "no such interface", unless not registering
it at the right time is also a possible or likely way for it to go wrong
...