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Re: Updating alists

From: David Kastrup
Subject: Re: Updating alists
Date: Thu, 30 Dec 2021 22:30:30 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Jean Abou Samra <> writes:

> Le 30/12/2021 à 12:36, Lukas-Fabian Moser a écrit :
>> It's much worse than that: It's not the first time _I've_ been
>> tripped up by this (previously it was with sort!). I'll just have to
>> write 100 copies of
>> "The exclamation mark in something! does not mean the function is
>> guaranteed to make the desired change in-place."
>> on my wall.
> :-)
> For assoc-set! and friends, I actually wonder why this
> is since when the function has exhausted the alist in
> its search for a matching pair, it could well set the
> last cdr to add the new pair at the end.

An empty list does not have a last cdr.

David Kastrup

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