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+{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
+{-# LANGUAGE ConstraintKinds, RankNTypes #-}
+{-# LANGUAGE TemplateHaskell #-}
+
+module T8807 where
+
+import Data.Proxy
+
+foo :: $( [t| forall a b. a b => Proxy a -> b -> b |] )
+foo = undefined
+