GNU bug report logs - #27177
26.0.50: Macroexpanding cl-loop and friends (make-symbol usage)

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Message #38 received at 27177 <at> debbugs.gnu.org (full text, mbox):

From: Alex <agrambot <at> gmail.com>
To: npostavs <at> users.sourceforge.net
Cc: Michael Heerdegen <michael_heerdegen <at> web.de>, 27177 <at> debbugs.gnu.org,
 monnier <at> iro.umontreal.ca
Subject: Re: bug#27177: 26.0.50: Macroexpanding cl-loop and friends
 (make-symbol usage)
Date: Fri, 02 Jun 2017 17:46:01 -0600

npostavs <at> users.sourceforge.net writes:

> Alex <agrambot <at> gmail.com> writes:
>
>>> AFAICT `print-circle' and `print-gensym' also control how `prin1'
>>> prints.
>>
>> Does print-circle? Consider:
>>
>> (prin1 `(cons ,(make-symbol "hello")
>> 	      ,(make-symbol "hello")))
>>
>> print-gensym certainly makes a difference in the output, but
>> print-circle doesn't seem to.
>
> You're producing 2 different symbols, try
>
>     (let ((sym (make-symbol "hello")))
>       (prin1 `(cons ,sym ,sym)))

Right, sorry for the bad example. I don't know what I was thinking.

>> However, I don't know how prin1 would keep track of the uninterned
>> symbols across many different procedure calls, which it would need to do
>> for it to know what is being shared.
>
> It looks like `print-continuous-numbering' and `print-number-table'
> might be relevant.

That does look like an option, thanks. I'd still like for cl-macs.el to
produce readable output without all of these extra print-* variables
set, but if it's infeasible to do that, then I'll look into using those.

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