[issue28649] refleak in typing.py

[Roundup Robot]

Roundup Robot added the comment:

New changeset 555f0ca31587 by Guido van Rossum in branch '3.5':
Issue #28649: fix second issue with _ForwardRef (#328)
https://hg.python.org/cpython/rev/555f0ca31587

New changeset 0f863906cf2e by Guido van Rossum in branch '3.6':
Issue #28649: fix second issue with _ForwardRef (#328) (3.5->3.6)
https://hg.python.org/cpython/rev/0f863906cf2e

New changeset 84b4ac243508 by Guido van Rossum in branch 'default':
Issue #28649: fix second issue with _ForwardRef (#328) (3.6->3.7)
https://hg.python.org/cpython/rev/84b4ac243508

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<http://bugs.python.org/issue28649>
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