[luatex] bug related to attribute and math

[Taco Hoekwater]

Dohyun Kim wrote:
> HI,
> 
> On compiling following tex code, I get failed assertion error.
> 
> $ cat t.tex
> \attributedef\xyz 11
> \xyz-1

You can't really assign negative values to an attribute (at the
moment), doing so is the same as unsetting it. The assertion failure
is a bug but I won't fix that right now since I intend to lift that
limitation soon.

Best wishes,
Taco