Update examples

testsuite/pdynload/spj4/Plugin.hs

@@ -0,0 +1,16 @@
+module Plugin where
+
+-- user doesn't import the API
+-- and provides a polymorphic value
+
+-- import API
+-- resource :: Interface
+
+--
+-- should pass type check, and dump core
+--
+-- resource :: Num a => a
+
+import API
+
+resource = Interface { field = 7 :: Num a => a }