GNU bug report logs - #32841
assoc-set fails with dot notation association list

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Message #14 received at 32841 <at> debbugs.gnu.org (full text, mbox):

From: John Cowan <cowan <at> ccil.org>
To: Mark H Weaver <mhw <at> netris.org>
Cc: 32841 <at> debbugs.gnu.org, Christopher.Hood <at> gtri.gatech.edu
Subject: Re: bug#32841: assoc-set fails with dot notation association list
Date: Thu, 27 Sep 2018 08:09:46 -0400

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On Wed, Sep 26, 2018 at 11:03 PM Mark H Weaver <mhw <at> netris.org> wrote:


> To initialize an alist that will be mutated, you must instead do
> something like this:
>
>   (define capitals (list (cons "New York" "Albany")
>                          (cons "Oregon"   "Salem")
>                          (cons "Florida"  "Miami")))
>

More simply, you can wrap the literal in a call to copy-tree.  This returns
a deep copy of the literal that is fully mutable.

-- 
John Cowan          http://vrici.lojban.org/~cowan        cowan <at> ccil.org
Here lies the Christian, judge, and poet Peter,
Who broke the laws of God and man and metre.

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