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Re: `defun' doesn't complain when arglist is missing.

From: Pascal J. Bourguignon
Subject: Re: `defun' doesn't complain when arglist is missing.
Date: Thu, 24 Oct 2013 23:23:17 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

Nicolas Richard <address@hidden> writes:

> Alex Bennée <address@hidden> writes:
>> You can happily C-x C-e eval-last-sexp both of those defuns without
>> complaint. The error in the defun only shows up when you try and execute 
>> them.
> I was caught by this a few times. Wouldn't it make sense to add 
>   (unless (and (listp arglist)
>                (null (delq t (mapcar #'symbolp arglist))))
>     (error "Malformed arglist: %s" arglist))
> near the beginning of "defun" in byte-run.el ? Or am I being naive
> again ?
> I guess it's not there for a reason, but what is it ?

    (require 'cl)
    (unless (and (listp arglist) (every (lambda (arg) (and arg (symbolp arg))) 
      (error "Malformed arglist: %s" arglist))

or if you insist on not using cl,

    (dolist (arg (if (listp arglist) arglist '("")))
       (unless (and arg (symbolp arg))
          (error "Malformed arglist: %s" arglist)))

__Pascal Bourguignon__

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