[dev-context] Crash with luatex-fonts

[Khaled Hosny]

The following sample would crash luatex using context distriputed
luatex-plain format:
%%%
\font\arab="SimpleNaskhi.ttf:script=arab;language=dflt;mode=node;+init;+medi;+fina;+rlig;+liga;+mark"\arab
\textdir TRT
اللهِ 
\bye
%%%

(the font used
http://code.google.com/p/raqm/source/browse/trunk/fonts/simplenaskhi/SimpleNaskhi.ttf)

With the message:
%%%
error: ...texmf/tex/plain/luatex-plain/luatex-fonts-merged.lua:7765:
attempt to call field 'register_message' (a nil value)
%%%

It seems that fonts.register_message is not defined. 
Pressing enter after that will crash luatex:

%%%
luatex: ../../../source/texk/web2c/luatexdir/tex/linebreak.c:1660:
ext_do_line_break: Assertion `varmem[((cur_p)+1)].hh.v.RH ==
0+4+4+4+4+4+4+2+2+2' failed.
Aborted
%%%

Regards,
 Khaled


-- 
 Khaled Hosny
 Arabic localiser and member of Arabeyes.org team
 Free font developer
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