I think that it would be good if this tutorial not only explained what closures are, but also the common "variable will not stay shared" gotcha. This tends to be hit in mod_perl when people use Apache::Registry
and wrap what was a working program inside of a function.
If you are trying to explain what the problem is and why it is impossible to resolve properly, the example at Re (tilly) 9: Why are closures cool? may help...
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