[lltx] patch for lualatex-math.lua

[Philipp Stephani]

Thanks for the patch; I've already merged Philipp Gesang's equivalent patch
and will do a new release ASAP.


2013/8/3 Wolfgang Jeltsch <wolfgang at cs.ioc.ee>

> Hi Philipp,
>
> I don’t know if you have followed the recent discussion on lualatex-dev
> about an issue with the lualatex-math package.
>
> The code in lualatex-math.lua relies on unpack being a global variable,
> which was the case in Lua 5.1, but is not the case anymore in Lua 5.2.
> As a result, I get the following error when importing amsmath and
> lualatex-math in the same document:
>
>     ! LuaTeX error
>     .../texmf-dist/tex/lualatex/lualatex-math/lualatex-math.lua:46:
>     attempt to call upvalue 'unpack' (a nil value)
>     stack traceback:
>             .../texmf-dist/tex/lualatex/lualatex-math/lualatex-math.lua:46:
>             in function 'print_class_fam_slot'
>             [string "\directlua "]:1: in main chunk.
>     \__lltxmath_set_mathchar:NN ...\int_eval:n {`#2})}
>                                                       \scan_stop:
>
> Other Lua files (lualibs-basic-merged.lua, lualibs-lua.lua, and
> luaotfload-merged.lua) use the following code to work around this
> incompatibility between Lua 5.1 and Lua 5.2:
>
>     if not table.unpack then
>       table.unpack=_G.unpack
>     elseif not unpack then
>       _G.unpack=table.unpack
>     end
>
> By adding this code to lualatex-math.lua at an appropriate place, I was
> able to fix the issue with lualatex-math and amsmath.
>
> I’ve attached a patch. Could this patch or some other fix for the
> problem please be incorporated into lualatex-math? Thank you.
>
> Best wishes,
> Wolfgang
>
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