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T8883.hs:21:1: error: [GHC-80003]
• Non type-variable argument in the constraint: Functor (PF a)
• When checking the inferred type
fold :: forall {a} {b}.
(Functor (PF a), Regular a) =>
(PF a b -> b) -> a -> b
Suggested fix: Perhaps you intended to use FlexibleContexts
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