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I updated texlive this morning and discovered that unicode-math is broken:
<argument> \xetex_suppressfontnotfounderror:D
Here is a MWE:
\documentclass[12pt]{article}
\usepackage{unicode-math}
\begin{document}
\end{document}
Is there a workaround until the problem is fixed?
It works with the development version of expl3, seems to have got ahead of ctan release, this will work in the meantime.
\documentclass[12pt]{article}
\ifdefined\suppressfontnotfounderror
\expandafter\let\csname xetex_suppressfontnotfounderror:D\endcsname
\suppressfontnotfounderror
\else
\expandafter\let\csname xetex_suppressfontnotfounderror:D\endcsname
\luatexsuppressfontnotfounderror
\fi
\usepackage{unicode-math}
\begin{document}
\end{document}
You can downgrade your fontspec. Here is the instruction.
Download the old version of fontspec from https://github.com/wspr/fontspec/releases/tag/v2.4d, extract it somewhere, and execute make unpack. Finally copy files to their respective positions. On my system, it is /usr/local/texlive/2015/texmf-dist/source/latex/fontspec/fontspec.dtx and /usr/local/texlive/2015/texmf-dist/tex/latex/fontspec/.
According to https://github.com/wspr/fontspec/issues/215, this bug will be fixed in next upgrade in CTAN. So I think it is safe to do this.
expl3 from CTAN if you are that desperate fro a fix!