There's an issue with slime-search-property and xemacs. In xemacs, next-single-char-property-change returns nil if the property is not found instead of the end of the object as in emacs. This problem shows up when you're using M-p/M-n to find the next compiler note/warning in the source code. We get an error about (goto-char nil) when the last note is found.
Here is small patch to slime-search-property so that it works with xemacs. I was not sure what the best approach would be for this, so I'm sending the patch.
Ray
--- slime.el 04 Feb 2011 09:26:36 -0500 1.1355 +++ slime.el 08 Feb 2011 22:46:17 -0500 @@ -4834,9 +4834,17 @@ Return the value of PROP. If BACKWARD is non-nil, search backward. If PROP-VALUE-FN is non-nil use it to extract PROP's value." - (let ((next-candidate (if backward + (let ((next-candidate (if (featurep 'xemacs) + (if backward + #'(lambda (pos prop) + (or (previous-single-char-property-change pos prop) + (point-max))) + #'(lambda (pos prop) + (or (next-single-char-property-change pos prop) + (point-max)))) + (if backward #'previous-single-char-property-change - #'next-single-char-property-change)) + #'next-single-char-property-change))) (prop-value-fn (or prop-value-fn (lambda () (get-text-property (point) prop))))