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

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From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Sho Takemori <stakemorii <at> gmail.com>
Cc: Nicolas Petton <nicolas <at> petton.fr>, 23105 <at> debbugs.gnu.org
Subject: bug#23105: 25.0.92; map-put does not change its argument MAP
Date: Thu, 24 Mar 2016 16:57:01 +0100

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.


Michael.

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