On Tue, Dec 10, 2019 at 9:27 PM Henri Menke <henrimenke@gmail.com> wrote:

> Dear devs,
>
> The example below crashes LuaTeX with a segmentation fault.  It is
> reproducible
> with LuaTeX 1.10.1 7143 and LuaTeX 1.11.2 7226.  To this end I built 7226
> from
> source with --debugopt to get a backtrace, which can be found below as
> well.
>
> Cheers, Henri
>
> ---
>
> \directlua{token.set_macro(-1, "foo","\string\\,")}
> \show\foo
> \foo
> \bye
>

I guess that we have to check if catcodetable -1 is already defined...

--
luigi