Update examples

testsuite/unloadAll/null/Null.hs

@@ -0,0 +1,12 @@
+module Null ( resource )  where
+
+import API
+import Data.Dynamic
+import Prelude hiding (null)
+import qualified Dep
+
+resource = Dep.resource
+
+-- ! this has to be special: it can't be overridden by the user.
+resource_dyn :: Dynamic
+resource_dyn = toDyn resource