ability to run code and check output in tests

tests/Auto.newt

@@ -0,0 +1,24 @@
+module Auto
+
+pfunc i2s : Int -> String := `(i) => ''+i`
+pfunc _++_ : String -> String -> String := `(a,b) => a + b`
+
+infixl 4 _++_
+
+-- We need sugar and marking as class/instance on all of this
+
+data Show : U -> U where
+  MkShow : { A : U } -> ((show : A) -> String) -> Show A
+
+-- FIXME - we'd like to inline this, so `show _ {{showInt}} a` ends up as `i2s a`
+show : {A : U} {{myshow : Show A}} -> A -> String
+show {_} {{MkShow foo}} a = foo a
+
+showInt : Show Int
+showInt = MkShow i2s
+
+ptype World
+pfunc log : {A : U} -> A -> World := `(_, a) => console.log(a)`
+
+main : Int -> World
+main _ = log ("answer: " ++ show 42)