length (1,2) ?
A reminder that tuples do not have a Foldable instance. You could try, but you'd get a kind error.
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That is very obviously one, given by the kind of Foldable.
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instance Foldable ((,) a) -- Defined in `Data.Foldable'
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I am aware of this instance. There is no instance for tuples.
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bifoldable ftw
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Lens ftw!
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Everything's possible in the world where a set has a head.
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