RE: /srv/bzr/emacs/trunk r112347:*doc/lispintro/emacs-lisp-intro.texi (defcustom, defun, simplified-beginning-of-buffer, defvar, Building Robots, Review, save-excursion): `defun' and `defcustom' are now macros ratherthanspecial forms. (Bug#13853)

[Stephen J. Turnbull]

Drew Adams writes:
 > >  > By `functionp':
 > >  > (defmacro foo (a) 42)
 > >  > (functionp 'foo) => t
 > > 
 > > Surely not!
 > 
 > Ouch!  mea culpa.
 > 
 > I need to stop checking things with Emacs prior to Emacs 22.

If it returns t in any Emacs in which macros are not funcall'able,
functionp is buggy (unless the docstring was also changed, but that
seems unlikely).  A better test is whether `(funcall 'foo nil)'
errors.