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Re: pcase-dolist

From: Tassilo Horn
Subject: Re: pcase-dolist
Date: Thu, 09 Jul 2015 15:34:00 +0200
User-agent: Gnus/5.130014 (Ma Gnus v0.14) Emacs/25.0.50 (gnu/linux)

Thierry Volpiatto <address@hidden> writes:

>> As I've said, you can use cdr-matching with a don't-care-pattern,
>> e.g.,
>>   (pcase-let ((`(,a ,b . ,_) (file-attributes "~/.emacs")))
>>     (list a b))
>> which clearly states that you know that the list returned by
>> `file-attributes' has more than two elements but you are only interested
>> in the first two.
> Ah! Ok so the dont-care-pattern handle all the remaining elements.

No, the crucial part is the dot separating the front from the rest of
the list.  With `(,a ,b . ,r) the list of the 8 remaining file
attributes would be bound to r.  When you don't need those, you can omit
the binding with the don't care pattern.


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