make sub {...} have the same form as map {...} and grep {...}.

I didn't say that; I said that prototyping allows Iterator to behave like map { ... } and grep { ... }. And I agree, it also allows Iterator to behave like sub { ... }.

Meanwhile, curious about the origination of "syntactic sugar", I found this quote:

Syntactic sugar causes cancer of the semicolon;
And a hundred other goodies at http://www.cs.yale.edu/quotes.html.

In reply to Re^7: "a bit of sugar "(HOP) by hbm
in thread "a bit of sugar "(HOP) by Wiggins

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