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> Excuse my ignorance, but is there a “official” (read:     
> preferred/reliable) way to detect that you have run a module        
> directly as a program instead of loading it with require()?        
> Like the “name == main” trick in Python?        
> I have seen suggestions to use debug.getinfo() to probe the call    
> stack depth, and testing whether the stack is too shallow to be     
> inside a call to require(). Does that work? Is there a better way?  
> Thanks.

I've been using lua now for some years and I never had the need for
this. Could you elaborate on why you want to use this? It should be
possible to put your code in a module which is always called by
require(). If you also want to have a standalone version of this
module, just use a main file where you require this module and execute
the needed code. 

Kind regards,