next steps for closure iterators

tests/objects/tobject2.nim

@@ -0,0 +1,21 @@
+# Tests the object implementation
+
+type
+  TPoint2d {.inheritable.} = object
+    x, y: int
+
+  TPoint3d = object of TPoint2d
+    z: int # added a field
+
+proc getPoint( p: var TPoint2d) =
+  {.breakpoint.}
+  writeln(stdout, p.x)
+
+var
+  p: TPoint3d
+
+TPoint2d(p).x = 34
+p.y = 98
+p.z = 343
+
+getPoint(p)