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+{-# OPTIONS_GHC -XDeriveDataTypeable -XStandaloneDeriving #-}
+
+-- See Trac #1825
+-- Test stand-alone deriving for Typeable
+-- Horridly, one needs to define instance for Typeable1 etc
+
+module ShouldCompile where
+
+import Data.Typeable
+
+data T1 a = T1 a
+data T2 a b = T2 a b
+
+deriving instance Typeable1 T1
+deriving instance Typeable2 T2
+