next steps for closure iterators

tests/objects/tofopr.nim

@@ -0,0 +1,26 @@
+discard """
+  file: "tofopr.nim"
+  output: "falsetrue"
+"""
+# Test is operator
+
+type
+  TMyType = object {.inheritable.}
+    len: int
+    data: string
+    
+  TOtherType = object of TMyType
+   
+proc p(x: TMyType): bool = 
+  return x of TOtherType
+    
+var
+  m: TMyType
+  n: TOtherType
+
+write(stdout, p(m))
+write(stdout, p(n))
+
+#OUT falsetrue
+
+