> Max Moiseev wrote:
>
> FWIW, the ‘classical’ way of doing what I think you’re trying to do is:
>
> extension Sequence {
> var pairs: AnySequence<(Iterator.Element, Iterator.Element)> {
> return AnySequence(zip(self, self.dropFirst()))
> }
> }
>
> Does it have the right behavior?
It doesn't if the sequence is single-pass or if iterating over it multiple
times has other unwanted side-effects.
— Pyry
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