Hi, Looks like a great project! I'm using openmcl and have run into a few issues :) Here's fixes for a couple of them: for swank-openmcl.lisp add the following to enable trace functionality (defun tracedp (fname) (ccl::%traced-p fname)) (defslimefun toggle-trace-fdefinition (fname-string) (let ((fname (from-string fname-string))) (cond ((tracedp fname) (ccl::%untrace-1 fname) (format nil "~S is now untraced." fname)) (t (ccl::%trace-0 (list fname)) (format nil "~S is now traced." fname))))) slime-edit-fdefinition fails when either the symbol entered has a package prefix, or when the definition itself has a package prefix. Here's how I repaired it: In slime.el, slime-goto-source-location ((:function-name name) ;; pay attention to the package name (let ((package (slime-buffer-package))) (if (string-match ":" name) (progn (string-match "\\(.*\\):+\\(.*\\)" name) (setq name (substring name (match-beginning 2) (match-end 2))) (setq package (substring name (match-beginning 1) (match-end 1))) )) (let ((case-fold-search t)) ;; maybe the use explicity mentions the package (maybe not) (re-search-forward (format "^(\\(def.*[ \n\t(]\\)?\\(%s\\)?:?:?%s[ \t)]" package name)))) (goto-char (match-beginning 0))) -Alan