Re: Always-true predicate?

[Robert Pluim]

>>>>> On Sat, 20 Feb 2021 10:21:47 -0500, Stefan Monnier 
>>>>> <monnier@iro.umontreal.ca> said:

    >> ./lisp/wdired.el172:    (define-key map "\C-m"     'ignore)
    >> ./lisp/wdired.el173:    (define-key map "\C-j"     'ignore)
    >> ./lisp/wdired.el174:    (define-key map "\C-o"     'ignore)

    Stefan> Don't know about these.  Maybe `undefined` would be more 
appropriate?

That would signal an error if the user pressed them, no? Maybe you can
ask Stefan-from-2005:

commit a8f8c39013d510311c8bdcab9a943e23526372ae
Author: Stefan Monnier <monnier@iro.umontreal.ca>
Date:   Mon Apr 11 19:01:31 2005 +0000

    Doc fixes.
    (wdired-confirm-overwrite): Rename from wdired-is-ok-overwrite.
    (wdired-use-dired-vertical-movement): Rename from
    wdired-always-move-to-filename-beginning.
    (wdired-mode-map): Use `ignore' instead of `wdired-newline'.
    (wdired-change-to-wdired-mode): Change mode name.
    (wdired-newline): Delete.

diff --git a/lisp/wdired.el b/lisp/wdired.el
--- a/lisp/wdired.el
+++ b/lisp/wdired.el
@@ -236,3 +181,3 @@
-    (define-key map "\C-m"     'wdired-newline)
-    (define-key map "\C-j"     'wdired-newline)
-    (define-key map "\C-o"     'wdired-newline)
+    (define-key map "\C-m"     'ignore)
+    (define-key map "\C-j"     'ignore)
+    (define-key map "\C-o"     'ignore)