[issue36665] Dropping __main__ from sys.modules clears the REPL namespace

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

The ``sys`` import gets cleared as well (accidentally omitted from the previous comment):

```
>>> sys
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'sys' is not defined
```

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<https://bugs.python.org/issue36665>
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