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+{-# OPTIONS_GHC -XDeriveDataTypeable #-}
+
+-- Trac #1935
+-- See Note [Superclasses of derived instance] in TcDeriv
+
+module Foo where
+
+ import Data.Data
+
+ data Foo a = Foo
+    deriving (Data, Typeable)
+
+ data T a = MkT (S a) deriving( Ord )
+
+ instance Num a => Eq (T a)
+
+ data S a = S
+ instance Eq (S a)
+ instance Ord (S a)
+
+
+ 
+\ No newline at end of file