# Re: [NTG-context] [luatex-plain] disappearing math-on node

On 4/3/2014 6:29 PM, Dohyun Kim wrote:

Hi,

This is a bug report based on the issue discussed at

\font\tenrm{file:lmroman10-regular.otf:mode=node;script=latn}\tenrm
\setbox0\vbox{%
x\penalty-10000
$a$x$a$
}
\unvbox0
\setbox0\lastbox
\unhbox0
\end

The plain tex code shown above fails with a lua error:
luatex-fonts-merged.lua:9616: attempt to index local 'current' (a nil value)

My guess is: as math-on (math-off too) is a "discardable" item after a
linebreak, the first math-on node has gone away. So the
math-on/math-off pair has become broken, by which the behavior of
"node.end_of_math" is confused.


mtxrun --script plain test.tex

runs ok here so i need an example that fails with context or luatex-plain


normally the font callback is called on a hlist and there are always paired math nodes

(what is line 9616 in the current beta?)


If indeed the end_of_math is a problem i can remove that optimiziation in the generic code

Hans

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