GNU bug report logs - #29220
26.0.90; eieio-persistent-read fail to restore saved object.

Previous Next

Full log

Message #68 received at 29220 <at> debbugs.gnu.org (full text, mbox):

From: pierre.techoueyres <at> free.fr (Pierre Téchoueyres)
To: Noam Postavsky <npostavs <at> users.sourceforge.net>
Cc: Eric Abrahamsen <eric <at> ericabrahamsen.net>, 29220 <at> debbugs.gnu.org,
 Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#29220: 26.0.90;
 eieio-persistent-read fail to restore saved object.
Date: Tue, 28 Nov 2017 23:18:45 +0100

Noam Postavsky <npostavs <at> users.sourceforge.net> writes:

> On Tue, Nov 28, 2017 at 4:39 PM, Pierre Téchoueyres
> <pierre.techoueyres <at> free.fr> wrote:
>> Noam Postavsky <npostavs <at> users.sourceforge.net> 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.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.