Hi,

I'm in the process of updating to TeXlive 2023 after a long time of light use with 2018. One issue I'm now having is an error when I try to use Neo Euler as my math font.

\definefontfamily[mypalatinoeuler][rm][TeX Gyre Pagella]
\definefontfamily[mypalatinoeuler][mm][Neo Euler]

\setupbodyfont[mypalatinoeuler]

\starttext
$x=1$
\stoptext

Result:

mathematics     > tweak > 'Neo-Euler', size 7, math size 3, version 'Version 000.002' found, version 'Version 000.002 ' expected
tex error       > tex error on line 5 in file ./euler_problem.tex:

lua error:

        registered function call [1160]: ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3254: stack overflow
stack traceback:
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3254: in upvalue 'add'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3254: in upvalue 'add'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3254: in upvalue 'add'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3254: in upvalue 'add'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3254: in upvalue 'add'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3254: in upvalue 'add'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3254: in upvalue 'add'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3254: in upvalue 'add'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3254: in upvalue 'add'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3254: in upvalue 'add'
        ...     (skipping 99970 levels)
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3267: in local 'action'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3617: in upvalue 'tweaklist'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3653: in upvalue 'applytweaks'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/math-act.lmt:3682: in upvalue 'mathematics_tweakaftercopyingfont'
        [string "local mathematics_tweakaftercopyingfont = mat..."]:5: in local 'runner'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/font-ctx.lmt:510: in field 'aftercopyingcharacters'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/font-con.lmt:859: in field 'scale'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/font-otl.lmt:659: in function <...xlive/2023/texmf-dist/tex/context/base/mkxl/font-otl.lmt:651>
        (...tail calls...)
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/font-def.lmt:378: in function <...xlive/2023/texmf-dist/tex/context/base/mkxl/font-def.lmt:366>
        (...tail calls...)
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/font-def.lmt:485: in field 'read'
        ...xlive/2023/texmf-dist/tex/context/base/mkxl/font-ctx.lmt:1377: in function <...xlive/2023/texmf-dist/tex/context/base/mkxl/font-ctx.lmt:1234>
        (...tail calls...)

It works if I use, say, [TeX Gyre Pagella Math] in place of [Neo Euler].

15:49:15 $ context --version
mtx-context     | ConTeXt Process Management 1.04
mtx-context     |
mtx-context     | main context file: /usr/local/texlive/2023/texmf-dist/tex/context/base/mkiv/context.mkiv
mtx-context     | current version: 2023.03.10 12:15
mtx-context     | main context file: /usr/local/texlive/2023/texmf-dist/tex/context/base/mkxl/context.mkxl
mtx-context     | current version: 2023.03.10 12:15

I don't know how to diagnose any further.

Cheers,

Rory Molinari