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

[Pierre Dupond]

On Wed, 13 May 2020 10:32:48 -0300
Phelype Oleinik <phe.h.o1 at gmail.com> wrote:

> 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
>
>     \setmathfont{Asana-Math}{[Extension=.otf,]}
>
> 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
> better.
Thanks. I understand much better now and I can write my style file.