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<interactive>:2:1: error:
• Non type-variable argument
in the constraint: Num (t2 -> t1 -> t3)
(Use FlexibleContexts to permit this)
• When checking the inferred type
it :: forall {t1} {t2} {t3}. (Num t1, Num (t2 -> t1 -> t3)) => t3
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