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> lua selfissue.lua | luac -l -l -o /dev/null

This does not work as intended because luac does not read from stdin
by default. This invocation makes luac process luac.out, which probably
existed from a previous run.

Use this instead:
	lua selfissue.lua | luac -l -l -p -

Note that you can use '-p' instead of '-o /dev/null'