Re: /srv/bzr/emacs/trunk r100690: Replace delete-backward-char Lisp calls in Viper (Bug#6552).

[Leo]

Hello Yidong,

The other day I was going to fix all the delete-backward-char warnings
in Emacs but didn't finish it because I encountered things like
backward-delete-char-untabify and it does make the code a bit more
difficult to read with the extra ().

I wonder whether defining a compiler macro will be much easier and
less pain. Preliminarily something like:

,----
| (require 'cl)
| (define-compiler-macro delete-backward-char (n &optional killflag)
|   `(delete-char (- ,n) ,killflag))
`----

And we can continue using the current doc string in delete-backward-char
to warn users about its future uses.

Just a thought.

HTH,
Leo