bug#24245: 25.0.93; AUCTeX TeX-function-p

[4854nw+cqdha1cwehn9k]

What is the actual purpose of the Lisp function `TeX-function-p' found
in AUCTeX ‘tex.el’?

(defun TeX-function-p (arg)
  "Return non-nil if ARG is callable as a function."
  (or (and (fboundp 'byte-code-function-p)
       (byte-code-function-p arg))
      (and (listp arg)
       (eq (car arg) 'lambda))
      (and (symbolp arg)
           (fboundp arg))))

How this code is better of `functionp'?
If there is no actual design improvement of `TeX-function-p' over
`functionp', the latter is supposed to be faster as it is built-in.

A similar function, `message-functionp', in `message.el' has been
removed. See Debian Bug report log #223493.

- a.

In GNU Emacs 25.0.93.1 (x86_64-w64-mingw32)
 of 2016-04-23 built on KAEL
Windowing system distributor 'Microsoft Corp.', version 10.0.14393
Configured using:
 'configure --prefix=/tmp/emacs --without-imagemagick 'CFLAGS=-O2
 -fomit-frame-pointer -g0''

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND DBUS NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS





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