"LaTeX3 Error: Command '\textsi' not yet defined!"

[Jürgen Spitzmüller]

Am Samstag, den 15.02.2020, 22:52 +0000 schrieb David Pesetsky:
> I was using Lyx for Mac rather extensively to write a long-ish
> manuscript about a year ago, but have been away from it for a while.
> 
> In the interval, a problem has arisen, though nothing has changed in
> my setup besides updating Lyx and Latex via TexLive.  I install the
> embrac package, which ensures non-italic brackets in otherwise
> italicized environments.  This used to work without a problem, but
> now generates the error message:
> 
> LaTeX3 Error: Command '\textsi' not yet defined!

That's a problem in the embrac package following a recent update of the
fontspec package. See:

https://groups.google.com/d/msg/comp.text.tex/h8Jl4fqaF9E/RDx8zM0dCgAJ

The embrac maintainer should have been made aware of the problem, but
I'd say it cannot harm if you file a bug report at
https://bitbucket.org/cgnieder/embrac/issues

Jürgen
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