GNU bug report logs - #12895
24.3.50; Replacement for flet

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Antoine Levitt <antoine.levitt <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; Replacement for flet
Date: Thu, 15 Nov 2012 14:35:41 +0100

Hi,

I'm trying to dynamically bind a function, and used flet
previously. flet is now apparently obsolete. The docstring suggests
using cl-flet. But cl-flet does lexical binding, not dynamic. How do I
get the old behavior (dynamic binding) without using the now-obsolete
flet? I'm confused by the number of subtly different functions to do the
same thing - letf, flet, labels, cl-labels, cl-letf, cl-flet - and find
the docstrings to be unclear. If I understand correctly, letf is what I
need, but the following does not do what I expect it to (ie suppress the
message)

(defun something ()
  (message "hi"))

(letf ((message (lambda () (&rest args) nil)))
  (something))

Is this because message is a built-in?

Sorry if this has been covered elsewhere, I couldn't find it.

Antoine

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