--- /dev/null
+effectfulId :: a -> <Proc> a\r
+effectfulId x = x\r
+\r
+//double :: (a -> <e> a) -> a -> <e> a\r
+double f x = f (f x)\r
+\r
+doubleId = double effectfulId\r
+\r
+main :: Integer\r
+main = runProc (doubleId (13 :: Integer))\r
+--\r
+13
\ No newline at end of file