save-buffer sets global 'dir' variable to nil

[Jonas Jarnestrom]

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Please write in English, because the Emacs maintainers do not have
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In GNU Emacs 20.6.1 (sparc-sun-solaris2.6, X toolkit)
 of Fri Mar  3 2000 on iris
configured using `configure  --with-gcc --with-pop --with-x-toolkit=lucid 
--bindir=/usr/local/bin --libexecdir=/usr/local/libexec'

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:


Perhaps not a show stopper, but not a clean behavior.
I first thought my code was erring, but it turned out to be
save-buffer that fucked up my 'dir' argument.

My code:

(defun cs-tmp-edit-file (rfile dir action &optional framename vobp)
  (and (buffer-modified-p)
       (not (ding))
       (y-or-n-p "Buffer is modified, save your changes? ")
       (save-buffer))
  (or rfile
      (setq rfile (cs-get-file-in-dir-with-mouse dir framename vobp)))
  <---------snipped---------------->

If save-buffer is executed, dir is reset to nil on the call to next
func.
Or simpler:

(setq dir "jonas")
(save-buffer)
dir  ; evaluates to nil