bug#33441: reading and printing Lisp Objects - what changed from 25.3.1 to 26.1?

[Noam Postavsky]

On Tue, 20 Nov 2018 at 15:57, Paul Eggert <eggert@cs.ucla.edu> wrote:

> The syntax error occurs at the "#5" here:
>
> ... #s(#5 "" "" "" nil nil nil nil nil) (:custom-groups nil
> :documentation "Placeholder Class base." ...
>
> and you might want to investigate what is outputting "#5".

Standard Emacs printing functions will produce that for circular
structures if print-circle is nil (otherwise they use #5#).