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bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object.

From: Pierre Téchoueyres
Subject: bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object.
Date: Tue, 28 Nov 2017 23:18:45 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

Noam Postavsky <address@hidden> writes:

> On Tue, Nov 28, 2017 at 4:39 PM, Pierre Téchoueyres
> <address@hidden> wrote:
>> Noam Postavsky <address@hidden> writes:
>>>> I've tried to dive into print.c but I don't understand how you return
>>>> from print_object, when you're on an hash-table to obtain the vector
>>>> with an eieio-class-tag--<class> (as in 25.3) ?
>>>> Can anyone tell me how this work in 25.3 ?
>>> Nothing has changed in print.c in this respect.  In 25.3, objects are
>>> vectors, and class tags are symbols.  In 26, objects are records and
>>> class tags are eieio--class records.  As a result, they print
>>> differently.
>> I trust you, but that's not the answer I expected, sorry.
> When you say "that's not the answer I expected", do you mean that my
> answer didn't sufficiently explain to you why things worked correctly
> in Emacs 25.3 and not in Emacs 26? Or do you mean that you would
> expect Emacs 26 to work differently (i.e., in a way that doesn't break
> things)?

Both and none of them :-)

I try to understand how, from print_object, objects in the hash table
are print.
I expected something like

prin1 -> print -> print_object -> something in lisp or C

I'm trying to make pcache work correctly with emacs 26.
Now I understand that eieio--class and eieio--class-tag have changed,
but I don't know if I can or how to correct the printing of objects in
order to read them back with eieio-persistent-read.

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