[XeTeX] Is it a bug on inter-char tokens?

[Jonathan Kew]

On 2 Dec 2007, at 4:28 am, Yin Dian wrote:

> Hi all,
>
> It seems that \char cannot trigger the right inter-char token when the
> inter-char token between boundary and the specific class is not empty.
> The following code shows a minimal example.
>
> \XeTeXcharclass 65=22
> \XeTeXinterchartoks 22 0={\message{22-0}}
> \XeTeXinterchartoks 0 22={\message{0-22}}
> \XeTeXinterchartoks 22 255={\message{22-255}} % comment these two  
> lines
> \XeTeXinterchartoks 255 22={\message{255-22}} % to get the right  
> result
> \XeTeXinterchartokenstate=1
> \tracingall
> hello \char 65 world
> \bye
>
> It is expected to trigger the inter-char token between 22 and 0 after
> the \char command. However, the inter-char token between 255 and 22 is
> triggered, and the log file suggests the \char 65 is considered a
> blank space, and thus not displayed in the pdf file. Leaving the
> inter-char token between 255 and 22 empty could generate the right
> result.
>
> I'm using the latest xetex-dev in W32TeX. Can this "bug" be found on
> other platforms?

I can confirm that the same behavior occurs on Mac OS X. Looks like a  
bug to me; I will investigate. Thanks for the report, and the clear  
test case.

JK