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<interactive>:2:10: error:
• Found hole: _ :: f a
Where: ‘f’, ‘a’ are rigid type variables bound by
the inferred type of it :: Functor f => f (Maybe a)
at <interactive>:2:1-10
• In the second argument of ‘(<$>)’, namely ‘_’
In the expression: Just <$> _
In an equation for ‘it’: it = Just <$> _
• Relevant bindings include
it :: f (Maybe a) (bound at <interactive>:2:1)
Constraints include Functor f (from <interactive>:2:1-10)
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