how to restore let binding variables after minibuffer keybord-quit

["Ye Wenbin" <wenbinye@163.com>]

Hello,
I wrote a elisp to input chinese character. I want add a command to input
english letter when the input method activated. The function defined as  
following:

   (defun eim-insert-ascii ()
     (interactive)
     (let (after-change-functions)
       (insert (read-from-minibuffer ""))))

But when use C-g to quit from minibuffer, the after-change-functions  
doesn't restore
to the original value. Is there a way to restore let binding variables  
after keybord-quit?

Thanks!
-- 
Using Opera's revolutionary e-mail client: http://www.opera.com/mail/