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> If a function's upvalues pointed to all the instances of that function
> on the stack, and assuming that the function does not exist in any
> tables, then if that function set all of it's upvalues to nil, and
> then a GC collection, then it would cause itself to be collected. This
> then causes all kinds of fun (i.e. segfaults) as the current
> environment table has probably just been collected as well.

Could you explain better? I am afraid I cannot understand what you have

-- Roberto