Hello all,
With the TL2014 pretest version of LuaTeX,
\csname\csname\endcsname
leads to the error
! Missing \endcsname inserted.
<to be read again>
\^^@csnam\^^@endcsnam
l.1 \csname\csname\endcsname
which looks like some form of 'out by one' issue.
--
Joseph Wright