fixes #3636

tests/iter/twrap_walkdir.nim

@@ -0,0 +1,16 @@
+
+
+
+import os
+
+# bug #3636
+
+proc fooIt(foo: string): iterator(): (string) =
+  iterator temp(): (string) =
+    for f in walkDirRec(foo): # No problem with walkFiles
+      yield f
+  return temp
+
+let it = fooIt(".")
+for x in it():
+  echo x