>>> This reminds me of something I've wanted more than a handful of times 
>>> -- it'd be nice to have a function/macro like
>>> 
>>> (when-file-has-changed "/etc/mailcap"
>>>   (do-the-parsing))
>>> 
>> 
>> See attached patch.
>
> And here's another attempt to fix the bug, which uses the 
> when-file-has-changed macro.
>

ENOPATCH catched.