Include Countable after move

Author: Girgias

language/predefined/interfaces.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- EN-Revision: 26e26a95fdc3aac9b464068953ea3105dee00f14 Maintainer: pastore Status: ready -->
+<!-- EN-Revision: 267a3d4e60d8a6da941e72d195386b5841052cca Maintainer: pastore Status: ready -->
 <!-- Reviewed: no Maintainer: cucinato -->
 <!-- CREDITS: khelaz,cucinato -->
 <part xml:id="reserved.interfaces" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
@@ -17,6 +17,7 @@
  &language.predefined.iteratoraggregate;
  &language.predefined.internaliterator;
  &language.predefined.throwable;
+ &language.predefined.countable;
  &language.predefined.arrayaccess;
  &language.predefined.serializable;
  &language.predefined.closure;