Taco Hoekwater <[EMAIL PROTECTED]> writes:
> David Kastrup wrote:
>> Frank Küster <[EMAIL PROTECTED]> writes:
>>
>>> There is a configuration variable nest_size level, but it doesn't seem
>>> to help in this case: The attached file gives an error
>>>
>>> ! TeX capacity exceeded, sorry [grouping levels=255].
>>>
>>> although my texmf.cnf has nest_size=500.
>>
>> I find it awfully hard to reliably trigger a semantic nest size
>> overflow. The best I have been able to come up with was
>>
>> Can anybody think of a semantic nest without grouping apart from
>> unrestricted hmode (which I use above)?
>
> The example that was attached by Frank (or Stijn?) does just fine.
But that's not without grouping as far as I can see, so it is not really
different from what I had. If you put a line
{{{{{{{{{{{{{{{{{{{{{
before the problem, then it will again bomb out with a grouping error
instead. At least that is what I think I see when looking at the error
message and context.
In short: I don't see how one can trigger semantic nest errors when the
semantic nest limit is more than twice the grouping limit (which it
isn't right now). I might still be overlooking something, though.
Already the single possibility to switch between semantic lists without
a corresponding group switch that I can think of (basically
\leavevmode/\par) escaped Knuth in the TeXbook Appendix D. As a result,
the next edition (if we will see it) will have a quite simpler version
of \removevboxes in it than previous ones.
But there may be some rationale behind the current semantic nest size
limit...
> [EMAIL PROTECTED] ...nd \z@ [EMAIL PROTECTED]@@p \boldmath {{b^c}}
> }
> \makebm #1$->\bm {#1}
> $
> [EMAIL PROTECTED] ... {\hbox {#1$\displaystyle [EMAIL PROTECTED] #2$
> }}{\hbox
> {#1$\textstyle \m...
>
> [EMAIL PROTECTED]@@p ...fmmode [EMAIL PROTECTED] #1{#2}{#2}{#2}{#2}
> \else \bfseries #1#2\fi
> [EMAIL PROTECTED] ...nd \z@ [EMAIL PROTECTED]@@p \boldmath {{b^c}}
> }
> \makebm #1$->\bm {#1}
> $
> [EMAIL PROTECTED] ... {\hbox {#1$\displaystyle [EMAIL PROTECTED] #2$
> }}{\hbox
> {#1$\textstyle \m...
>
> [EMAIL PROTECTED]@@p ...fmmode [EMAIL PROTECTED] #1{#2}{#2}{#2}{#2}
> \else \bfseries #1#2\fi
> [EMAIL PROTECTED] ...30049 [EMAIL PROTECTED]@@p \boldmath {{b^c}}
> }
> \makebm #1$->\bm {#1}
> $
> \makelabel ...h {\makebm }\normalfont \bfseries #1
> :}
> \sbox #1#2->\setbox #1\hbox [EMAIL PROTECTED] #2
> [EMAIL PROTECTED] }
> [EMAIL PROTECTED] ...i \fi \sbox [EMAIL PROTECTED] {\makelabel {#1}}
> \global \setbox
> [EMAIL PROTECTED] \...
> l.11 \item[$a^{b^c}$]
> $a^{b^c}$
> ! ==> Fatal error occurred, no output PDF file produced!
--
David Kastrup
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