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

[Pierre Téchoueyres]

Hello Eric,
Any news on this fix ?

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> On 12/15/17 23:26 PM, Pierre Téchoueyres wrote:
>> Of course with the good example and patch this will be more obvious.
>
> Oh bother, this is my fault, in c59ddb2120. The attached diff fixes
> this, and I guess should be put in.
>
> In #29541 I was hoping to reduce some of this complexity and make the
> code easier to reason about, but those changes would go into master, and
> this needs to be fixed in 26.
>
> More tests are definitely in order!
>
> diff --git a/lisp/emacs-lisp/eieio-base.el b/lisp/emacs-lisp/eieio-base.el
> index 0241f27395..a37cf7a1b3 100644
> --- a/lisp/emacs-lisp/eieio-base.el
> +++ b/lisp/emacs-lisp/eieio-base.el
> @@ -349,7 +349,7 @@ eieio-persistent-validate/fix-slot-value
>                         (seq-some
>                          (lambda (elt)
>                            (child-of-class-p (car proposed-value) elt))
> -                        classtype))
> +                        (if (consp classtype) classtype (list classtype))))
>                 (eieio-persistent-convert-list-to-object
>                  proposed-value))
>                (t
>