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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 22:39:04 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

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.
I tried to follow the trace from the call of `eieio-persistent-save'
until I could find where it prints the content of the hash table.

What bothers me is that, in emacs 25, you had have  an short vector with
a symbol and now you've an big object dump instead.

Emacs 25 :
[eieio-class-tag--person "Bob"]

Emacs 26 :
#s(#2=#s(eieio--class person nil nil [#s(cl-slot-descriptor name #3=#:unbound 
string nil)] #s(hash-table size 65 test eq rehash-size 1.5 rehash-threshold 
0.8125 data (name 0)) nil ((:name . name)) #1=[] #1# #s(#2# #3#) 
(:custom-groups nil)) "Bob")

As a side note: as class tags are now eieio--class objects you can't read
an object saved with emacs 25 in emacs 26. Maybe this incompatibility
should be documented into NEWS ?

I hope that I'm not too harsh. It's not my intention.

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