>> Well rand() gives a different answer each time, so that can automatically 
>> be
>> counted as being reassigned in the eyes of the infinite-loop-catcher.  If
>> you try to implement your own RNG in a macro then obviously the random
>> variable will be reassigned so that would also count.
>
>  Which one of the myriad of variables inside a potential macro call should
> be enough change to decide that it's not an infinite loop?

"at least one of the variables mentioned in the #while condition"

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