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-rw-r--r--Misc/NEWS.d/next/Core and Builtins/2017-09-04-10-46-09.bpo-28411.IU9rQL.rst4
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+``PyInterpreterState`` has a "modules" field that is copied into
+``sys.modules`` during interpreter startup. This causes problems if a
+program replaces ``sys.modules`` with something else. To solve this we
+eliminate ``PyInterpreterState.modules``.