bug#36649: 27.0.50; pure space and pdumper

[Andy Moreton]

On Thu 04 Mar 2021, Eli Zaretskii wrote:

>> From: Robert Pluim <rpluim@gmail.com>
>> Date: Thu, 04 Mar 2021 15:56:10 +0100
>> Cc: eggert@cs.ucla.edu, Andreas Schwab <schwab@linux-m68k.org>,
>>  Stefan Kangas <stefankangas@gmail.com>, 36649@debbugs.gnu.org, 
>> larsi@gnus.org,
>>  Andrea Corallo <akrl@sdf.org>
>> 
>> I think Emacs already assumes Qnil == 0, since there are places that
>> use ! to check for Qnil rather than using NILP.
>
> Those are bugs that need to be fixed.  Fast.

Agree that they are bugs, but also see NIL_IS_ZERO and memclear() in lisp.h.

    AndyM