Moritz, why should a position depending use-case be passed around??? Do you pass around the head of foreach or the flip-flop-operator?
Sorry your completely missing the point, to find a solution for a one-way and one-place iterator+generator.
Evidently if the iterator has to be passed around, you definetely need a initial construction in a generator. CPAN has this already.
If you can't imagine, better think of literals:
nobody initializes a variable and use it just once in the next line, when he can just use a literal string...
TIMTOWTDI
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