bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects

[Eli Zaretskii]

> Cc: pipcet@gmail.com, 41321@debbugs.gnu.org, monnier@iro.umontreal.ca
> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Wed, 27 May 2020 09:58:11 -0700
> 
> In looking into this more, it appears that the maybe_lisp_pointer idea is 
> wrong,
> in that compilers can make pointers into a Lisp object while losing the 
> address
> of the original object (and we've seen them do this) and there's no guarantee
> that these sub-pointers are GCALIGNED.

Sorry, I don't follow: what do you mean by "losing the address of the
original object" in this case?  Can you show an example?