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{-# LANGUAGE TypeFamilies, FlexibleContexts #-}
module T3460 where
class Nat n where
toInt :: n -> Int
class (Nat (Arity f)) => Model f where
type Arity f
ok :: Model f => f -> Arity f -> Int
ok _ n = toInt n
bug :: (Model f, Arity f ~ n) => f -> n -> Int
bug _ n = toInt n
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