bug#19564: 24.4; eieio backward compatibility

[Thierry Volpiatto]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> Files compiled with Emacs-25 are indeed not expected to work on
> Emacs-24, but the other way should work (tho some of the changes in
> EIEIO aren't backward compatible at their core, but so far those seemed
> not to affect existing .elc files), so if it doesn't please M-x
> report-emacs-bug, so we can see if/how we can fix it.

Done.
bug#19625.

-- 
Thierry
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