restricted system commands enabled.
(./lua-print-input-levels.tex [1] (./fs4.tex [2] (./fs4.tex [3] (./fs4.tex [4]
(./fs4.tex [5] (./fs4.tex [6] (./fs4.tex [7] (./fs4.tex [8]
! TeX capacity exceeded, sorry [text input levels=15].
\next ...and \\input fs4 \noexpand \\message{L}")}
\fi
l.1 \next
\message {e}
! ==> Fatal error occurred, bad output DVI file produced!
No pages of output.
Transcript written on lua-print-input-levels.log.