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{-# LANGUAGE Rank2Types #-}
-- This one showed up a bug in pre-subsumption
module ShouldCompile where
class Data a where {}
type GenericQ r = forall a. Data a => a -> r
everything :: (r -> r -> r) -> GenericQ r
everything k f = error "urk"
-- | Get a list of all entities that meet a predicate
listify :: (r -> Bool) -> GenericQ [r]
listify p = everything (++)
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