Bug#3241: derived.el fails in emacs
Derived.el, after deriving from Text mode or one of its derivatives,
The problem can be fixed by using the version of derived.el
distributed with emacs-19.31 with the 19.30 binary. I have not tested
the 19.31 version with 19.30 binary extensively, but it seems to be
Here is a demonstration of the problem.
Invoke emacs with "emacs -q -no-init-file -l foo.el" where foo.el is
the file below between -----s. You will be in a newly defined mode
"Bugly". Press any letter key, and you get an error. You can't
backtrace this error.
This does not happen when deriving from Fundamental mode.
; fundamental-mode causes no problem
; text-mode and derivative modes (e.g., latex-mode) cause the problem.
(define-derived-mode bugly-mode text-mode "Bugly"
"documentation" (message "Firing up Bugly Mode"))