[Bug 1519152] Re: unicode-math package results in Undefined control sequence \__um_set_big_operator:nnn

[Michael Terry]

Thanks, Anders for the patch!  I've uploaded it to xenial, and passed
our delta on to Debian.  Hopefully in the future, we can get back in
sync.

** Changed in: texlive-base (Ubuntu)
       Status: New => In Progress

** Changed in: texlive-extra (Ubuntu)
       Status: New => Invalid

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Title:
  unicode-math package results in Undefined control sequence
  \__um_set_big_operator:nnn

Status in texlive-base package in Ubuntu:
  In Progress
Status in texlive-extra package in Ubuntu:
  Invalid

Bug description:
  The unicode-math LaTeX package no longer works at all in either of its
  supported TeX engines (xelatex and lualatex). Downgrading texlive-
  math-extra from 2015.20151116-1 to 2015.20150810-1 makes it work
  again.

  $ cat test.tex
  \documentclass{article}
  \usepackage{unicode-math}
  \begin{document}
  \end{document}

  $ xelatex test.tex
  This is XeTeX, Version 3.14159265-2.6-0.99992 (TeX Live 2015/Debian) (preloaded format=xelatex)
   restricted \write18 enabled.
  entering extended mode
  …
  ! Undefined control sequence.
  \__um_set_big_operator:nnn ...r_gset_active_eq:nN 
                                                    {#3}\__um_tmpa: \__um_set_...
  l.3 \begin{document}
                      
  ? 

  (Same result with lualatex.)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: texlive-math-extra 2015.20151116-1
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  NonfreeKernelModules: openafs
  ApportVersion: 2.19.2-0ubuntu6
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Mon Nov 23 19:52:51 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-06-02 (174 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
  PackageArchitecture: all
  SourcePackage: texlive-extra
  UpgradeStatus: Upgraded to xenial on 2015-10-28 (26 days ago)

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