[luatex] core dump with \nonscript

[David Carlisle]

Hi,

This crash is reported with a user in 0.95

https://tex.stackexchange.com/questions/343599/how-do-i-resolve-the-assertion-failed-popups

But I see a failure with a cygwin texlive build of 1.01

This is LuaTeX, Version 1.0.1 (TeX Live 2017/dev)
 restricted system commands enabled.
(./ww114.texassertion "varmem[(p)].hh.v.RH!=null" failed: file
"../../../source/texk/web2c/luatexdir/tex/mlist.w", line 4050,
function: mlist_to_hlist
Aborted (core dumped)




The test file as plain tex




\def\isomorphism{%
  \mathrel{%
    \mathpalette\xisomorphism{}%
  }%
}
\def\xisomorphism#1#2{%
% Calculate the amount of moving \sim up as in \simeq
  \setbox0\hbox{$#1\simeq$}%
  \setbox2\hbox{$#1\sim$}%
  \dimen0=\ht0 %
  \advance\dimen0 by -\ht2 %
%----------------------------
% Compose the two symbols
%----------------------------
  \setbox0\hbox{%
    \lower1.9\dimen0\hbox{%
      $#1\relbar\isomorphismxjoinrel\relbar$%
    }%
  }%
  \rlap{%
    \hbox to \wd0{%
      \hfill\raise\dimen0\hbox{$#1\sim$}\hfill
    }%
  }%
  \copy0 %
}
\def\isomorphismxjoinrel{%
  \mathrel{%
    \mkern-3.4mu %
    \mkern-1mu %
    \nonscript\mkern1mu %
  }%
}

$$ A \isomorphism B^{C \isomorphism D^{E \isomorphism F}} $$

\bye