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>I need to determine if a Lua script does something -- anything -- nor not.

I think this is similar to the halting problem, right?

>For example, this script does nothing:
>"function main(arg)

It sure does: it sets the global "main".

>Is there a way that Lua can be convinced to determine this for me?  I'm
>thinking that once the script is compiled, one could quickly scan it for any
>"set" opcodes and such?

If you're worried only about variables being set, then you can easily parse
the output of luac -l, as etc/globals.lua does.

Does the script below do something?

	for i=1,10 do end