jfbu <j...@free.fr> added the comment:

I can confirm the "Improper discretionary list" error from xetex build is a 
xetex bug which is present at XeTeX 0.99992 and absent at XeTeX 0.99996 and 
presumably all more recent releases.

It was seen at https://github.com/sphinx-doc/sphinx/issues/3546 and reported to 
XeTeX mailing list at http://tug.org/pipermail/xetex/2017-March/027056.html

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<https://bugs.python.org/issue31589>
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