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Optionals are also "applicative", but Haskellers used them for a long time before applicative functors became popular. A concept can support a certain way of thinking about it without everyone needing to think that way :)

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you don't need to think that way, no, but i was pretty sure that rust optionals were modeled after the maybe monad. perhaps not.

oh ok i misread your original, you were only referring to type inference. i thought you were saying none of the languages mentioned had monads.

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