[metapost] Luamplib + instancenames

[Christophe Poulain]

Before a recent update of luamplib (but I don't know the version number
which cause this :( ), this code

--------------------------------
\documentclass{article}
\usepackage{luamplib}
\begin{document}
\def\InstanceName{A}
\begin{mplibcode}[\InstanceName]
  beginfig(1);
  draw (0,0)--(50,50);
  pair H;
  H=(0,0);
  endfig;
\end{mplibcode}
\end{document}
-----------------------
worked. Now, it products nothing.
It's an update (and so, how make a personalize instancename ?) or a bug ?

Greetings
Christophe Poulain
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