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bug#24913: 25.1.50; Emacs accepts undocumented and confusing combination
From: |
Eli Zaretskii |
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@gmail.com>
> Date: Thu, 10 Nov 2016 12:58:39 +0000
>
> Philipp Stephani <p.stephani2@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.