Re: Built-in Functions and Special Forms

[Greg Hill]

> At 2:38 AM +0100 2/27/03, Pascal
> Bourguignon wrote:
> > I've not found any predicate to
> > distinguish between built-in functions
> > and special forms.
>
> In Emacs-21, the documentation is
> consistent enough that this seems to always work.
>
> (defun special-form-p
> (symbol)
>     (string-match
> "\\.\\.\\.\\|&rest" (documentation
> symbol)))

 

Of course that should really be:

(defun special-form-p (symbol)

    (and (subrp (symbol-function symbol))

         (string-match "\\.\\.\\.\\|&rest" (documentation symbol))))

 

--Greg