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I spoke with ALAN at length about this the other day. He made
a point which I think is significant -- We should not be worrying
about whether this particular feature is good/bad or and error
or undefined. We should be worrying about why. Otherwise, we'll
be doomed to simply repeat this sort of discussion ad nauseum
every time someone encounters someone with poor or questionable
programming style using any powerful operator. So while I respect
that you think it's an error, I think the only really relevant
question is "What in the language spec makes it so, and how can
we write future specs to try to avoid this sort of problem without
precluding creative and reasonable uses of powerful operators?"