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From: Sam Halliday <sam.halliday@gmail.com>
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Subject: Re: get nargs for a function
Date: Sun, 30 Aug 2015 07:14:39 -0700 (PDT)
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On Sunday, 30 August 2015 03:22:46 UTC+1, Stefan Monnier  wrote:
> > (defun args (function)
> >   "The arg list of FUNCTION."
> >   (let ((kind (car function)))
> >     (if (eq kind 'closure)
> >         (cadr (cdr function))
> >       (cadr function))))
> 
> To get the description of the arglist, you're better off using
> `help-function-arglist'.

I don't believe that works here as the input is typically anonymous.