find-function-noselect blindly strips the last four characters from the filename; but the filename might end only in ".el", or in no extension. (The real problem is that evaluating a defadvice form (via eval-expression or similar) for a compiled file changes the return value of (compiled-function-annotation def) to "loadup.el".) The second chunk of this patch improves the error message when the definition can't be found in the particular file where it was searched for. -Michael Ernst mernst(a)cs.washington.edu --- /uns/lib/xemacs-20.4/lisp/prim/find-func.el Sun Feb 1 21:30:26 1998 +++ - Thu May 7 09:08:12 1998 ＠＠ -118,7 +118,10 ＠＠ (nth 1 def)) ((describe-function-find-file function)) ((compiled-function-p def) - (substring (compiled-function-annotation def) 0 -4)) + (let ((filename (compiled-function-annotation def))) + (if (string-match "\\.elc?\\'" filename 1) + (substring filename 0 (match-beginning 0)) + filename))) ((eq 'macro (car-safe def)) (and (compiled-function-p (cdr def)) (substring (compiled-function-annotation (cdr def)) 0 -4))))) ＠＠ -152,7 +155,7 ＠＠ (progn (beginning-of-line) (cons (current-buffer) (point))) - (error "Cannot find definition of `%s'" function)))))))) + (error "Cannot find definition of `%s' in library \"%s\"" function library)))))))) (defun find-function-read-function () "Read and return a function, defaulting to the one near point.