[luatex] can't run fontspec yet under TeXLive2013 (pre-release)

[Élie Roux]

> (/usr/local/texlive/2013/texmf-dist/tex/generic/babel/babel.def) !
> LuaTeX error [string "\directlua "]:1: invalid escape sequence near
> '\l'. \adddialect ...alect("\string #1", "\string #2") } \fi \fi
> \wlog {\string #1 ... l.61 \adddialect\l at naustrian\l at ngerman
>
> ?

Interesting... Is there a simple way to test TeXLive 2013? I'll update 
babel to the latest version, I guess it will be enough for the error to 
be raised...

> If I hit "r" at this point to enter nonstop mode, LuaLaTeX will
> actually finish the compilation without further error messages.
> However, it would be better not to encounter this error in the first
> place, right?

Absolutely.

Thank you,
-- 
Elie