[dev-context] Bug: attempt to double-free kern node

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 Cheers, Henri