Hi, The combination of the `lexical-let' macro and the `labels' macro produces the `(quote lambda)' element in its expanded form as the case may be, and the most recent bytecomp got to fail with it. Here is an example: (defun test (&optional msg) (lexical-let ((default "Hello World!")) (labels ((fn (&optional arg) (message "%s" (or msg default)))) (fn msg)))) It works, however it cannot be byte-compiled as follows: (byte-compile 'test) => !! error (("not a lambda -- (quote lambda)")) Whereas the version of XEmacs 21.4.22 does. The example above is a simplified extract of the `w3m-process-do-with-temp-buffer' macro that emacs-w3m uses; I'm unable to build and install it for XEmacs 21.5-b31 nowadays because of such errors. You can see the expanded form of `test' by: (progn (pp (macroexpand '(lexical-let ((default "Hello World!")) (labels ((fn (&optional arg) (message "%s" (or msg default)))) (fn msg))) )) nil) Regards, _______________________________________________ XEmacs-Beta mailing list XEmacs-Beta(a)xemacs.org http://lists.xemacs.org/mailman/listinfo/xemacs-beta