The following plain xetex document loops forever on \show\tmpb
the \show don't cause the looping, if they are replaced by
\def\zzzb{} xetex just hangs in a tight loop.
The fact that it loops isn't necessarily a bug.
\def\zzz{\zzz}\zzz
does the same, but are there any words that could be added to
the manual so that I could have predicted this?
I'm not sure why 255 is being triggered at all as
the X is being inserted into the middle of an existing hlist.
The manual says 255 represents
> a boundary between a `run' of characters and something else
So I guess I am asking what 'run' means in this context:-)
David
\XeTeXinterchartokenstate = 1
\newXeTeXintercharclass \Xclass
\XeTeXcharclass `\X \Xclass
\XeTeXinterchartoks 0 \Xclass = {\zza}
\XeTeXinterchartoks 255 \Xclass = {\zzb}
\def\zza{\futurelet\tmpa\zzza}
\def\zzza{\show\tmpa}
\def\zzb{\futurelet\tmpb\zzzb}
\def\zzzb{\show\tmpb}
xxxXxxx
\bye
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