Update examples

testsuite/eval/eval_fn1/Main.hs

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+{-# OPTIONS -fglasgow-exts #-}
+--
+-- polymorphic eval!
+--
+
+module Main where
+
+import Poly
+import System.Eval.Haskell
+
+main = do m_f <- eval "Fn (\\x y -> x == y)" ["Poly"]
+          when (isJust m_f) $ do
+                let (Fn f) = fromJust m_f
+                putStrLn $ show (f True True)
+                putStrLn $ show (f 1 2)

testsuite/eval/eval_fn1/Makefile

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+TOP=../../..
+include ../../eval.mk

testsuite/eval/eval_fn1/Poly.hs

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+{-# OPTIONS -cpp -fglasgow-exts #-} 
+module Poly where
+
+import AltData.Typeable
+
+data Fn = Fn {fn :: forall t. Eq t => t -> t -> Bool}
+
+--
+-- ignore type inside the Fn... is this correct?
+--
+instance Typeable Fn where
+#if __GLASGOW_HASKELL__ >= 603
+    typeOf _ = mkTyConApp (mkTyCon "Poly.Fn") []
+#else
+    typeOf _ = mkAppTy (mkTyCon "Poly.Fn") []
+#endif

testsuite/eval/eval_fn1/expected

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+True
+False