GNU bug report logs - #24913
25.1.50; Emacs accepts undocumented and confusing combinations of &optional and &rest in argument lists

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From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: 24913 <at> debbugs.gnu.org
Subject: bug#24913: 25.1.50; Emacs accepts undocumented and confusing combinations of &optional and &rest in argument lists
Date: Thu, 10 Nov 2016 12:58:39 +0000

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Philipp Stephani <p.stephani2 <at> gmail.com> schrieb am Mi., 9. Nov. 2016 um
22:19 Uhr:

>
> For example:
>
> (funcall (lambda (&optional &rest &rest &optional x) (list x)) 'a)
> => ((a))
>
> Obviously here the &rest keyword "wins", but I think that's overly
> confusing.  Such an argument list is most likely a programmer mistake,
> and should signal an error to make the programmer aware of the mistake.
>
>
Here's a patch that detects such argument lists.

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[0001-Prevent-dubious-argument-lists.txt (text/plain, attachment)]

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