The problem I'm reporting might be a problem of keeping 21.2 beta and mule-base in synch - but this way 21.1.7 doesn't work correctly with the current mule-base files. I decided therefore to send this to xemacs-beta in the hope to get some clarifying comments if my approach is the right way. Ok, here's the problem: Setting language support for any Cyrillic or Chinese variant leads to the following error: Lisp nesting exceeds `max-lisp-eval-depth' The problem is an endless loop. The function set-language-environment in lisp/mule/mule-cmds.el invokes the setup-function set by set-language-info-alist. This setup function calls (for Cyrillic-ISO) setup-cyrillic-iso-environment which calls again set-language-environment: Here are the relevant calls: (defun setup-cyrillic-iso-environment () "Setup multilingual environment (MULE) for Cyrillic ISO-8859-5 users." (interactive) (set-language-environment "Cyrillic-ISO")) From: lisp/mule/cyrillic.el (set-language-info-alist "Cyrillic-ISO" '((setup-function . (setup-cyrillic-iso-environment . setup-cyrillic-environment-map)) (defun set-language-environment (language-name) "Set up multi-lingual environment for using LANGUAGE-NAME. This sets the coding system priority and the default input method and sometimes other things." (interactive (list (read-language-name 'setup-function "Set language environment: "))) (if language-name (if (symbolp language-name) (setq language-name (symbol-name language-name))) (setq language-name "English")) (if (null (get-language-info language-name 'setup-function)) (error "Language environment not defined: %S" language-name)) (funcall (get-language-info language-name 'setup-function)) What should be done? Looking at XEmacs 21.2 beta, it seems (sorry, I don't know the code in enough details, yet) that we can remove the setup-*environment function - or replace it by an internal function. But removing the setup-function completly means that we have to change mule-cmds (?) also since otherwise the language is not displayed in the menu :-(. The appended fix gets Chinese-GB working for me - but Chinese-BIG5 does not appear anymore in the menu :-(. Could somebody with more knowledge of these functions help me to fix this? Thanks, Andreas 1999-09-29 Andreas Jaeger <aj(a)suse.de&gt; * mule/chinese.el: Use setup-chinese-gb-environment-internal as setup function for Chinese-GB. Remove setup-chinese-big5-environment for Chinise-BIG5 since it's not needed (lead to an endless loop). --- lisp/mule/chinese.el.~1~ Wed Feb 17 14:59:31 1999 +++ lisp/mule/chinese.el Wed Sep 29 09:52:29 1999 ＠＠ -190,8 +190,7 ＠＠ nil)) (set-language-info-alist - "Chinese-GB" '((setup-function . (setup-chinese-gb-environment - . setup-chinese-environment-map)) + "Chinese-GB" '((setup-function . setup-chinese-gb-environment-internal) (charset . (chinese-gb2312 sisheng)) (coding-system . (cn-gb-2312 iso-2022-7bit hz-gb-2312)) ＠＠ -240,9 +239,7 ＠＠ (set-charset-ccl-program 'chinese-big5-2 ccl-encode-big5-font) (set-language-info-alist - "Chinese-BIG5" '((setup-function . (setup-chinese-big5-environment - . setup-chinese-environment-map)) - (charset . (chinese-big5-1 chinese-big5-2)) + "Chinese-BIG5" '((charset . (chinese-big5-1 chinese-big5-2)) (coding-system . (big5 iso-2022-7bit)) (sample-text . "Cantonese (�f�y,�s�F��) ����, �A�n") (documentation . ("Support for Chinese Big5 character set." -- Andreas Jaeger aj(a)suse.de aj(a)arthur.rhein-neckar.de for pgp-key finger ajaeger(a)aixd1.rhrk.uni-kl.de