[issue20766] reference leaks in pdb

[daniel hahler]

daniel hahler <python-bugs at thequod.de> added the comment:

Please see https://bugs.python.org/issue36667 for a followup.

It does not look like moving it to `interaction` is relevant for fixing the leak, is it?

I think it should be restored in both places.

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nosy: +blueyed

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<https://bugs.python.org/issue20766>
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