fix example in docs

[ghc-base.git] / Data / Complex.hs

diff --git a/Data/Complex.hs b/Data/Complex.hs
index 749ba91..0f8d13b 100644 (file)
--- a/Data/Complex.hs
+++ b/Data/Complex.hs
@@ -44,6 +44,9 @@ module Data.Complex
 import Prelude
 
 import Data.Typeable
+#ifdef __GLASGOW_HASKELL__
+import Data.Generics.Basics( Data )
+#endif
 
 #ifdef __HUGS__
 import Hugs.Prelude(Num(fromInt), Fractional(fromDouble))
@@ -62,7 +65,11 @@ infix  6  :+
 data (RealFloat a) => Complex a
   = !a :+ !a   -- ^ forms a complex number from its real and imaginary
                -- rectangular components.
-  deriving (Eq, Read, Show)
+# if __GLASGOW_HASKELL__
+       deriving (Eq, Show, Read, Data)
+# else
+       deriving (Eq, Show, Read)
+# endif
 
 -- -----------------------------------------------------------------------------
 -- Functions over Complex