GNU bug report logs - #6583
23.2; cl loop macro with `and' clause

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Package: emacs;

Reported by: Kevin Ryde <user42 <at> zip.com.au>

Date: Wed, 7 Jul 2010 23:34:03 UTC

Severity: normal

Tags: confirmed

Merged with 56416

Found in versions 23.2, 24.5, 25.0.94, 29.0.50

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

From: Lawrence Mitchell <wence <at> gmx.li>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#6583: 23.2; cl loop macro with `and' clause
Date: Thu, 08 Jul 2010 09:28:35 +0100

Kevin Ryde wrote:
[...]

> I struck this when making a loop over an alist where I thought to take
> apart the key and value with an `and' as they didn't need to be
> sequential,

>     (loop for elem in my-alist
>           for k = (car elem) and v = (cdr elem)
>           do
>           ...

Note the idiomatic way of writing this loop:

(loop for (k . v) in my-alist
      do ...)

Although this does not address the question of the bug.

-- 
Lawrence Mitchell <wence <at> gmx.li>
This bug report was last modified 3 years and 75 days ago.

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