Correct me if I'm wrong, but isn't this more about autovivification than it is about aliasing? Your leading paragraph sounds about right, that aliasing can lead to hard to debug problems. But the meat of your Meditation appears to be an autovivification problem, to my eyes.
Update: I see where the aliasing comes in, but I still think the problem is caused by autovivification. It's all a matter of perspective, really, and I just wanted to explain mine. I suppose this is ambrus' Meditation, and he can say the topic is aliasing if he wants, but that doesn't change my view of the particular example he chose to use.
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