bug#67008: 30.0.50; Multiple major mode parents

[Ikumi Keita]

Hi Stefan,

>>>>> Stefan Monnier <monnier@iro.umontreal.ca> writes:
> Oh, I see so `japanese-LaTeX-mode` declares `japanese-latex-mode` as an
> extra parent but the alias makes it a cycle.
> Admittedly, in the current `provided-mode-derived-p` code, we actually
> don't signal errors in case of cycles, we just silently break them via
> de-duplications, so I just changed my code accordingly.

Great, it did work. Thank you very much!

>> It seems to me very difficult to arrange the proposed feature to cover
>> category [b], looking at its way to handle mode alias.

> Maybe there's something I'm missing, but the change was simple and I
> believe it does address your use case.

Now I think I can settle out the AUCTeX feature branch in clean and
consistent way.

Best regards,
Ikumi Keita
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