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: Eli Zaretskii <eliz <at> gnu.org>
To: Philipp Stephani <p.stephani2 <at> gmail.com>
Cc: 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: Fri, 18 Nov 2016 11:06:33 +0200

> From: Philipp Stephani <p.stephani2 <at> gmail.com>
> Date: Thu, 10 Nov 2016 12:58:39 +0000
> 
> 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. 

Thanks, please push to master.

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