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

[Eric Abrahamsen]

On 12/08/17 12:41 PM, Eli Zaretskii wrote:
>> From: Eric Abrahamsen <eric@ericabrahamsen.net>
>> Cc: pierre.techoueyres@free.fr (Pierre Téchoueyres),
>>   29220@debbugs.gnu.org,  Noam Postavsky <npostavs@users.sourceforge.net>,
>>  John Wiegley <jwiegley@gmail.com>, Eli Zaretskii <eliz@gnu.org>
>> Date: Tue, 05 Dec 2017 14:58:45 -0800
>> 
>> > I think so, but we're pretty late in the pretest, so better ask Eli&John
>> > if they think it's OK for emacs-26.
>> 
>> Okay: John and Eli, this patch is to handle changes in object
>> implementation in Emacs 26: they are now implemented with records, which
>> can't be round-tripped with prin1 and read, they have to be written and
>> read specially. The eieio-persistent mechanism handles that, but
>> previously did not look inside hash tables or vectors to see if there
>> were objects in there.
>> 
>> That's causing failure in the pcache library, which other libraries
>> depend on. I'm hoping we can sneak this in under the wire so that pcache
>> doesn't fail in Emacs 26.
>
> Fine with me to put this on emacs-26.

Thanks -- done.