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On 4/3/2014 6:29 PM, Dohyun Kim wrote:
This is a bug report based on the issue discussed at https://github.com/lualatex/luaotfload/issues/212
\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
It fails with the luatex-plain format from the minimals as of yesterday and Luatex 4972: error: .../context/tex/texmf-context/tex/context/base/font-ota.lua:144: attempt to index local 'current' (a nil value) . \bye ^^@-\par \vfill \supereject \end l.17 \bye Though the issue arises only in node mode.
normally the font callback is called on a hlist and there are always paired math nodes
(what is line 9616 in the current beta?)
Line 9626 with yesterday’s code. Attached are patches for font-ota.lua and luatex-fonts-otn.lua that guard all invocations of end_of_math() with checks for the subtype. Best, Philipp