Update examples

testsuite/dynload/should_fail/Makefile

@@ -0,0 +1,4 @@
+TEST=   dynload/should_fail
+EXTRA_OBJS=Plugin.o
+TOP=../../..
+include ../../build.mk

testsuite/dynload/should_fail/Plugin.hs

@@ -0,0 +1,12 @@
+{-# OPTIONS -fglasgow-exts #-}
+module Plugin where
+
+import API
+import AltData.Dynamic
+
+v :: Int
+v = 0xdeadbeef
+
+resource_dyn :: Dynamic
+resource_dyn = toDyn v
+

testsuite/dynload/should_fail/api/API.hs

@@ -0,0 +1,20 @@
+{-# OPTIONS -fglasgow-exts #-}
+
+module API where
+
+import AltData.Typeable
+
+data Interface = Interface { 
+        function :: String
+   }
+
+instance Typeable Interface where
+#if __GLASGOW_HASKELL__ >= 603
+    typeOf i = mkTyConApp (mkTyCon "API.Interface") []
+#else
+    typeOf i = mkAppTy (mkTyCon "API.Interface") []
+#endif
+
+plugin :: Interface
+plugin = Interface  { function = "goodbye" }
+

testsuite/dynload/should_fail/prog/Main.hs

@@ -0,0 +1,14 @@
+
+import System.Plugins
+import API
+
+main = do 
+    m_v   <- dynload "../Plugin.o" 
+                     ["../api"] 
+                     [] 
+                     "resource_dyn"
+
+    case m_v of
+        LoadFailure _    -> putStrLn "didn't compile"
+        LoadSuccess _ v  -> putStrLn $ function v
+

testsuite/dynload/should_fail/prog/expected

@@ -0,0 +1,4 @@
+Couldn't match `API.Interface' against `Int'
+	Expected type: API.Interface
+	Inferred type: Int
+didn't compile