I only see one definition of Iterator in your code - and it's outcommented. Essentially, "Iterator" is a noop, but because Perl allows you to leave off the 'sub' keyword if the first argument of a subroutine has prototype '&' (as here), the code is allowed to write: 
    return Iterator {BLOCK}

[download]
instead of 
    return sub {BLOCK}

[download]

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

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