On Sat, Apr 9, 2022 at 6:07 PM luigi scarso wrote:

On Sat, Apr 9, 2022 at 6:05 PM Henri Menke via luatex wrote:

...

Dear devs,

! error: (nodes): attempt to double-free kern node 239, ignored ! ==> Fatal error occurred, no output PDF file produced!

MWE:

\catcode`@=11

\Umathordordspacing\displaystyle=\thinmuskip \Umathordordspacing\textstyle=\thinmuskip

\def\operator@font{\fam0}

\def\qopname#1#2#3{% \mathop{\mathpalette\@qopname{#1\kern\z@\operator@font#3}}\csname n#2limits@\endcsname } \def\@qopname#1#2{% \hbox{$ \Umathordordspacing\displaystyle=0mu \Umathordordspacing\textstyle=0mu \m@th#1#2 $}}

\def\max{\qopname\relax m{max}} \def\min{\qopname\relax m{max}}

\catcode`@=12

$$\max a b / \min a b$$

\bye

ok, thank you . Checking it now.

It should be fixed in rev7518. -- luigi