[Dev-luatex] new luatex binary in TL pretest crashes when \directmeatpost is used

[Petr Olsak]

Hello luatex developers,

I installed TL pretest with new luatex binary and I found a bug in it, 
when \directmetapost defined in minim-mp package is used. Try the 
following file:

\input minim-mp

\directmetapost{
% define the pattern
picture letter; letter = maketext("a");
beginpattern(a)
     draw letter rotated 45;
     matrix = identity rotated 45;
endpattern(12pt,12pt);
% use the pattern
beginfig(1)
     fill fullcircle scaled 3cm withpattern(a) withcolor 3/4red;
     draw fullcircle scaled 3cm withpen pencircle scaled 1;
endfig;
}

\bye


and run luatex. The luatex from TL 2022 runs without problems but luatex 
from TL 2023 says:

This is LuaTeX, Version 1.16.0 (TeX Live 2023)
  restricted system commands enabled.
(./test.tex
(/usr/local/texlive/2023/texmf-dist/tex/luatex/minim-mp/minim-mp.tex
(/usr/local/texlive/2023/texmf-dist/tex/luatex/minim/minim-alloc.tex)
(/usr/local/texlive/2023/texmf-dist/tex/luatex/minim/minim-pdfresources.tex)){/
usr/local/texlive/2023/texmf-var/fonts/map/pdftex/updmap/pdftex.map}
! error:  (pdf backend): 2 unmatched 'save' after form shipout
!  ==> Fatal error occurred, no output PDF file produced!


Michal Vlasak noticed that the problem is probably related to the commit:

https://gitlab.lisn.upsaclay.fr/texlive/luatex/-/commit/c1909e4a4c5311197a253708614af973d9a6f989

Best regards

Petr Olsak