$found_extension variable no longer in use?

Hi all,

        My exim (4.34 with exiscan 4.34-21) configure file has this code:

==================================================
acl_check_mime:

   warn decode = default
   deny message = Blacklisted file extension detected ($found_extension)
     condition = ${if match \
         {${lc:$mime_filename}} \
         
{\N(\.exe|\.pif|\.bat|\.scr|\.lnk|\.com|\.reg|\.vbs|\.csr|\.cmd)$\N} \
       {1}{0}}
   accept
======================================================

But my logs display messages like this:

rejected during MIME ACL checks: Blacklisted file extension detected ()


Has the $found_extension variable been removed/changed? I couldn't
find anything about it in the ChangeLog, and from examples on the list
it seems like everyone else is using it successfully. Is it me?
Thanks.

 - jim -