...
(/opt/local/share/texmf-texlive/tex/latex/l3packages/l3keys2e/l3keys2e.sty)
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* LaTeX warning: "kernel/deprecated-command"
* 
* The deprecated command '\tl_to_lowercase:n' has been or will be removed on
* 2017-12-31.
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Runaway argument?
{\@ifpackageloaded {bidi}{
! Forbidden control sequence found while scanning use of \g@addto@macro.
<inserted text> 
                \par 
l.359          \xetex_if_engine:T