[luatex] nested ifincsname broken in luatex

[David Carlisle]

It's perhaps worth stressing that the error condition was just added so the
difference could be seen without looking at the typeset output: it's not
really related to the underlying issue.

This version runs without error without setting the suppress error flag


\ifcsname T\ifincsname e\else E\fi X\endcsname AAA\else zzz\fi
\bye


but typesets zzz  with luatex and AAA with pdftex/xetex

David
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