Update examples

testsuite/eval/eval2/Main.hs

@@ -0,0 +1,6 @@
+import System.Eval.Haskell
+
+main = do m_s <- eval "map toUpper \"haskell\"" ["Data.Char"]
+          case m_s of
+                Nothing -> putStrLn "typechecking failed"
+                Just s  -> putStrLn s