vm-dired compilation errors in XEmacs

[Uday Reddy]

Rainer Woitok reports (viewmail-info, 2013-07-22):

running "./configure ..." pro-
duced two warnings, and I just cannot tell whether they are trivial and
to be ignored or are sort of important:

"xemacs" -batch -no-autoloads -l ./vm-build.el -f batch-byte-compile vm-dired.el
Compiling /home/Rainer/prod/vm-8.2.0b/lisp/vm-dired.el...
Loading dired-mule...
While compiling vm-dired-do-attach-files in file /home/Rainer/prod/vm-8.2.0b/lisp/vm-dired.el:
  ** evaluating (= nil 0): (wrong-type-argument number-char-or-marker-p nil)
  ** evaluating (< nil 0): (wrong-type-argument number-char-or-marker-p nil)
Wrote /home/Rainer/prod/vm-8.2.0b/lisp/vm-dired.elc
Done

[Uday Reddy (reddyuday)]

Thanks for reporting. They do look like warnings because the compilation
got completed.

The code of `vm-dired-do-attach-files' uses a macro caled
`dired-map-over-marks' defined in the Emacs library. There are possibly
some problems with the macro. In GNU Emacs, it works fine for me. If you
are able to test this function in XEmacs, please let me know if it works.

[Uday Reddy (reddyuday)]

Rainer Woitok:

Here's what I got:

Loading vm-dired...
vm-dired not supported in Emacs version 21.4 (patch 22) "Instant Classic" XEmacs Lucid

[Julian Bradfield (jcb+vm)]

I think this is probably harmless. The nil it's complaining about is the second argument of the macro; at run time, these clauses should be protected by an "if (integerp arg) ...", so won't be hit.
I don't understand enough about compilation to know how to suppress the warning, but may try to find out.