[luatex] Fatal error with attr keyword to \hbox or \vbox

[luigi scarso]

On Tue, Oct 6, 2020 at 10:22 PM Esger Renkema <esgerrenkema at gmail.com>
wrote:

> Dear list,
>
> Using the attr keyword with \hbox or \vbox will cause a fatal error when no
> other (any other) attribute has been set before.
>
> For example, the file
>
> -----------------------------------------------------------
> \attribute 1 = 1
> \hbox attr 2 = 2{}
> \bye
> -----------------------------------------------------------
>
> compiles without problems, while
>
> -----------------------------------------------------------
> \hbox attr 2 = 2{}
> \bye
> -----------------------------------------------------------
>
> gives the following result:
>
> -----------------------------------------------------------
> This is LuaTeX, Version 1.12.0 (TeX Live 2020/Debian)
>   restricted system commands enabled.
> (./bug.tex
> ! error:  (nodes): trying to set an attribute fails, case 1
> !  ==> Fatal error occurred, no output PDF file produced!
> -----------------------------------------------------------
>
> The cause of this problem problem lies in the do_set_attribute function
> defined in texnodes.c: it expects an ‘attr list head, or zero’ but receives
> (and tries to return!) an attribute list node instead.
>
> The attached patch seems to solve the issue.
>
> Regards,
> Esger Renkema
>
>
Which format are you using ? plain ?
-- 
luigi
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