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

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You have been subscribed to a public bug by Anders Kaseorg (anders-kaseorg):

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)

** Affects: texlive-base (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: texlive-extra (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug regression-release xenial
-- 
unicode-math package results in Undefined control sequence \__um_set_big_operator:nnn
https://bugs.launchpad.net/bugs/1519152
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