Update examples

testsuite/eval/eval_fn1/Main.hs

@@ -0,0 +1,15 @@
+{-# 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)