Update examples

testsuite/unload/sjwtrap/prog/Main.hs

@@ -0,0 +1,15 @@
+
+import System.Plugins
+import API
+
+--
+-- what happens if we try to use code that has been unloaded?
+--
+
+main = do 
+    m_v   <- load "../Null.o" ["../api"] [] "resource"
+    (m,v) <- case m_v of
+        LoadSuccess m v -> return (m,v)
+        _               -> error "load failed"
+    putStrLn ( show (a v) )
+    unload m

testsuite/unload/sjwtrap/prog/expected

@@ -0,0 +1 @@
+42