Re: Need help with ad-do-it, it loops

[Lennart Borgman]

On Fri, May 8, 2009 at 9:30 PM, Stefan Monnier <address@hidden> wrote:
>>>> I have a strange case of looping in MuMaMo/nXhtml. One user (Rémi) has
>>>> this problem on Debian. This happens after starting from "emacs -Q"
>>>> and just loading nXhtml and pressing RET in the scratch buffer. The
>>>> output from the debugger says
>>>
>>>> Debugger entered--Lisp error: (error "Lisp nesting exceeds
>>>> `max-lisp-eval-depth'")
>>>>   ad-Orig-syntax-ppss-flush-cache(192 192)
>>>>   apply(ad-Orig-syntax-ppss-flush-cache 192 192)
>>>>   ...
>>>>   ad-Orig-syntax-ppss-flush-cache(192 192)
>>>>   apply(ad-Orig-syntax-ppss-flush-cache 192 192)
>>>>   syntax-ppss-flush-cache(192 192)
>>>>   self-insert-command(1)
>>>>   newline(nil)
>>>>   call-interactively(newline nil nil)
>>> [...]
>>>> I can't understand how this can loop. Any suggestions?
>>>
>>> Well, since you carefully hid the answer in "...", we can't
>>> really answer.
>
>> It just looping with the output
>
> So ad-Orig-syntax-ppss-flush-cache is now a function that calls
> ad-Orig-syntax-ppss-flush-cache rather than being the original function
> bound to syntax-ppss-flush-cache.  This shouldn't happen.
> To see it, try M-: (symbol-function 'ad-Orig-syntax-ppss-flush-cache).
>
> It means that it's either a bug in advice.el or that the function was
> manipulated in odd ways which confused advice, or something like that.

I have asked Rémi to check this. It looks like this problem disappears
when he compiles Emacs himself from CVS.