Update examples

testsuite/pdynload/poly1/Makefile

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+TEST=   pdynload/poly1
+EXTRA_OBJS=Plugin.o
+TOP=../../..
+include ../../build.mk

testsuite/pdynload/poly1/Plugin.hs

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+module Plugin where
+
+import API
+
+resource = plugin { function = (+) }

testsuite/pdynload/poly1/api/API.hs

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+module API where
+
+data Interface = Interface { 
+        function :: (Num a) => a -> a -> a
+}
+
+plugin :: Interface
+plugin = Interface  { function = error "no function defined" }
+

testsuite/pdynload/poly1/prog/Main.hs

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+
+import System.Plugins
+import API
+
+src     = "../Plugin.hs"
+wrap    = "../Wrapper.hs"
+apipath = "../api"
+
+main = do status <- make src ["-i"++apipath]
+          case status of
+                MakeSuccess _ _ -> f
+                MakeFailure e -> mapM_ putStrLn e
+
+   where f = do v <- pdynload "../Plugin.o" ["../api"] [] "API.Interface" "resource"
+                case v of
+                  LoadSuccess _ a -> let fn = function a in putStrLn $ show $ 1 `fn` 2
+                  _               -> putStrLn "wrong types"
+

testsuite/pdynload/poly1/prog/expected

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+3