[XeTeX] Xetex, Latex3, unicode-math and Math font not found

Phelype Oleinik phe.h.o1 at gmail.com
Wed May 13 15:32:48 CEST 2020

On Wed, May 13, 2020 at 10:22 AM Pierre Dupond <76nemo76 at gmx.ch> wrote:
> > \exp_args:Nxx \setmathfont
> >   { \tl_use:N \c__test_MathFont_tl }
> >   { [ \tl_use:N \c__test_MathFontSpec_tl ] }
> >
> Thanks for the explanations but this form does not work.

Sorry, my mistake. The three lines above expand to


which is wrong because the optional argument is not seen.  In this case
you'd need `\exp_last_unbraced:Nxx`, which can be defined as

    \cs_gset_protected:Npn \exp_last_unbraced:Nxx { \::x \::x_unbraced \::: }

but this interface should be used sparingly, so the `\use:x` version is


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