On 12/23/2025 12:14 AM, David Chiang wrote:
That works, thanks very much!
Just realize that it's an (in itself valid and stable) side effect: the
putting an expandafter in front of ending a local processing state token
is basically a no-op but it has the side effect of pushing back that
then already read next token which triggers a nesting cleanup.
(We could add such a cleanup but it means introducing an incompatibility
and that is not going to happen in luatex. It's fast enough anyway and
when one needs that much nesting, there is likely a better solution to
the problem at hand.)
Hans
On Dec 21, 2025 at 23:09:53, Max Chernoff <[email protected]
<mailto:[email protected]>> wrote:
Hi David,
On Sun, 2025-12-21 at 17:21 -0800, David Chiang wrote:
Is this the intended behavior,
I wouldn't say that it's intended, but it's definitely expected. You can
replicate fairly similar errors with just TeX code. Although I can't
replicate your error with only 10 000 loops, I needed 100 000 instead:
\directlua{
for i = 1, 100000 do
tex.runtoks(function () end)
end
}
\end
and is there a way to pop from the stack to avoid the overflow?
Probably the easiest solution in this case is to insert an \expandafter
every time that you call tex.runtoks:
\directlua{
local expandafter = token.create("expandafter")
for i = 1, 100000 do
tex.runtoks(function ()
token.put_next(expandafter)
end)
end
}
\end
There's also a coroutine trick that you can use
https://tug.org/TUGboat/tb39-1/tb121hagen-exec.pdf <https://tug.org/
TUGboat/tb39-1/tb121hagen-exec.pdf>
although you'll need probably need to modify that code a little bit to
work with the latest LuaTeX.
Probably a better solution is to not call tex.runtoks a hundred thousand
times since I can't really think of a scenario where that makes
sense---it usually makes more sense to just use tex.runtoks only a few
dozen times, even if that means that you need to include way more code
in each call.
Thanks,
-- Max
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