GNU bug report logs - #23105
25.0.92; map-put does not change its argument MAP

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Message #11 received at 23105 <at> debbugs.gnu.org (full text, mbox):

From: Nicolas Petton <nicolas <at> petton.fr>
To: Michael Heerdegen <michael_heerdegen <at> web.de>,
 Sho Takemori <stakemorii <at> gmail.com>
Cc: 23105 <at> debbugs.gnu.org
Subject: Re: bug#23105: 25.0.92; map-put does not change its argument MAP
Date: Thu, 24 Mar 2016 17:39:30 +0100

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Michael Heerdegen <michael_heerdegen <at> web.de> writes:

> Sho Takemori <stakemorii <at> gmail.com> writes:
>
>> By expanding map-put, I found that it returns a new list if "m" is a
>> list and the key is not in "m".
>
> Indeed, good catch.
>
> The implementation of `map-put' is wrong: it binds the evaluated place
> expression to a new symbol and uses that symbol as place to operate on.
>
> The intention presumably was to avoid code duplication in the macro
> expansion - which is good - but it fails to change the original place.

Indeed, it is wrong.  I will have a look at the issue.

Nico

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