Re: buffer-substring vs. buffer-substring-no-properties

[Stefan Monnier]

> >> PS: by the way all of the above works the same in Emacs-20 as in Emacs-21.
> 
> No, it does not.  That is the entire point.  RMS and others are
> telling this was a bug that was fixed in 21.1.  This example is from
> 20.7:
> 
> x
> #("(defun fo" 0 1 nil 1 6 (face font-lock-keyword-face) 6 7 nil 7 9 (face 
> font-lock-function-name-face))
> 
> (format "%s" x)
> "(defun fo"
> 
> (format "%S" x)
> "#(\"(defun fo\" 0 1 nil 1 6 (face font-lock-keyword-face) 6 7 nil 7 9 (face 
> font-lock-function-name-face))"
> 
> I depended on the 20.7 behavior.

But if you pass those results to your backend process (which is what
I was talking about) instead of passing them to the pretty printer,
the results will be the same in Emacs-20.7 as in Emacs-21.1:

- `defun fo'
- `defun fo'
- ` #("(defun fo" 0 1 nil 1 6 (face font-lock-keyword-face) 6 7 nil 7 9 (face 
font-lock-function-name-face))'

So you still haven't told us if you ever use the `%S' argument
to format or if you use prin1 somewhere in your code.  If
you do, that's probably your mistake and you should use something
else instead.


        Stefan