This is LuaTeX, Version 1.17.0 (TeX Live 2023)  (format=luatex 2026.4.29)  28 JUN 2026 16:38
 restricted system commands enabled.
**\directlua{callback.register('find_output_file', function(name, mode) if name
:find('%.log$') then return '/dev/null' elseif name:find('%.pdf$') then return 
'stdout' end return name end)} \input test1.tex
! Emergency stop.
<*> ...stdout' end return name end)} \input test1.tex
                                                  
*** (job aborted, no legal \end found)

!  ==> Fatal error occurred, no output PDF file produced!