[tex-live] e-TeX register sparse array bug

[Olaf Weber]

Hans Hagen writes:
> Olaf Weber wrote:

>> Through the Debian people I found out about a bug in e-TeX's handling
>> of registers.

> I don't have that problem here so maybe the problem is in the \[
> macro. Is there a difference when you run:

I'm reasonably certain that you _do_ have the problem; it is just
fairly difficult to trigger.  And as far as I've been able to
determine, it is a problem in the engine itself.

> \bgroup \[aa\] \egroup

> (maybe \bgroup \tracingall \[aa\] \egroup provides a clue)

>> $ cat etex-bug.tex
>> \documentclass{article}
>> \usepackage{amsmath}
>> \begin{document}
>> \makeatletter
>> \dimendef\z@=256\relax
>> \z@=0pt\relax
>> \[aa\]
>> \show\z@
>> \end{document}
>> $ latex etex-bug.tex
>> This is pdfeTeX, Version 3.141592-1.20a-rc7.1-2.1 (Web2C 7.5.3)
>> 
>> 
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-- 
Olaf Weber

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