Eric> Yeeeouch. And the proposed n-ary form is even worse.
On the other hand, we already have the problem with list comprehensions:
[f(i) for i in range(n) if g(i)]
Here, every evaluation of f(i) is preceded by an evaluation of g(i).
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Andrew Koenig, ark@research.att.com, http://www.research.att.com/info/ark