[dev-context] Crash with luatex-fonts

Khaled Hosny khaledhosny at eglug.org
Wed Jun 10 13:49:46 CEST 2009

The following sample would crash luatex using context distriputed
luatex-plain format:
\textdir TRT

(the font used

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.


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