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+{-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE DerivingStrategies #-}
+{-# LANGUAGE DerivingVia #-}
+{-# LANGUAGE StandaloneDeriving #-}
+{-# OPTIONS_GHC -Wunused-imports #-}
+module T17324 where
+
+import Data.Monoid (Sum(Sum), Product(Product), Dual(Dual))
+
+class C1 a
+deriving anyclass instance C1 (Sum a)
+
+class C2 a
+deriving anyclass instance C2 (Product a)
+
+class C3 a
+deriving via Dual a instance C3 (Dual a)