> I tried (define-key my-map "\C-!" 'my-cmd), which works in Emacs 20, but
> gives this error in Emacs 22: "Invalid modifier in string".
It worked under Emacs-20, but returned the same as "\C-a", i.e. probably not
what you intended. In Emacs-21 this was fixed to return an error rather
than silently turning it into somwething else.
> Anyway, for the key binding, I settled on (define-key my-map [C-!] 'my-cmd),
> after some experimentation - it seems to work for key bindings in both
> versions.
I'd expect it doesn't really work. It won't signal an error, but it won't
cause my-cmd to be run when you hit control and !. You probably meant to
use (define-key my-map [?\C-!] 'my-cmd) which should work. I'd recommend
(define-key my-map [(control ?!)] 'my-cmd)
which will also work under XEmacs.
Stefan
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