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+Formally added deprecation messages for ``namespace_packages``.
+The methodology that uses ``pkg_resources`` and ``namespace_packages`` for
+creating namespaces was already discouraged by the :doc:`setuptools docs
+</userguide/package_discovery>` and the
+:doc:`Python Packaging User Guide <PyPUG:guides/packaging-namespace-packages>`,
+therefore this change just make the deprecation more official.
+Users can consider migrating to native/implicit namespaces (as introduced in
+:pep:`420`).