[tex-k] [NTG-pdftex] Bug#458059:

[Taco Hoekwater]

David Kastrup wrote:
> Taco Hoekwater <taco at elvenkind.com> writes:

>> David Kastrup wrote:

>>> 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 was still very much focused on the bug report when I wrote the above,
so I misread your reply.

You are almost certainly right about the nest>2*groups, just with maybe
a small extra delta, like nest>2*groups+2 (because many functions push
the semantic nest before the save stack). I do not want to spend the
time (probably a lot of time) finding out the absolute truth, but I 
agree that a nest_size of 600 appears to make the error unreachable.


Best wishes,
Taco